Comprehensive list of OEM b5 a4 brake upgrades

[bikerbob951]

it depends on the wheel is made, for example ccw you can have an et 35 on a 9.5'' wide wheel with a 3'' lip or u can have an et 35 on a 1'' lip. The way the wheel sits on the car doesn't change. The face just moves in and out depending on the lip size and the et stays the same. The 3'' lip will have a face with a smaller back pad limiting big brake fitment vs the wheel with a 1'' lip will have a large back pad giving plenty of room for big brake fitment

I think that's what I'm dealing with. My wheels are 17x8 et35, and there is room for the brakes, just not that much. It's just because they are cheap cast wheels, the back of the wheel face is probably thicker than some others. I'll probably be adding 10 or 15mm spacers when I go lower, so it's really not a big deal, just a passing observation.

[elduderino200]

Side question:

Does anybody know the minimum thickness for the rotor for the A8/TT upgrade?

(D2 A8 312mm x 25mm rotors 8E0 615 301 R)

I'm looking into either paying someone to machine them down or just purchase new.

[Bordom]

Side question:

Does anybody know the minimum thickness for the rotor for the A8/TT upgrade?

(D2 A8 312mm x 25mm rotors 8E0 615 301 R)

I'm looking into either paying someone to machine them down or just purchase new.

It's almost always 2-3mm. Why are you machining? The rotor is thin enough as is

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[elduderino200]

No special reason, just to save money before I put new pads on. It'll be my third set of pads in 4-ish years, I figure I should swap/machine the rotors as well.

edit: Wait the minimum thickness for the rotor is 2-3mm? You're right that is pretty thin.

[MetalMan]

It'll be my third set of pads in 4-ish years

Yikes! I'm running Hawk HPS pads on my A8/TT setup. Have the same pads for nearly 3 years now, and doubt they're even half-way worn. But it's been only ~19k miles... with 50%-ish city driving.

[elduderino200]

It's not my horrible driving skills, it's the odd situation I have with pads:

Bought the car with low pads that needed replacing. Replaced with cheapo correct kind but I wasn't familiar with the A8/TT upgrade so I bought cheap pads in case I made a mistake with fitment, but now they squeal and don't make me feel comfortable if I have to brake in an emergency.

I've got a set of Hawk HPS pads that have been sitting by my desk for a few months that are waiting to go on, but I haven't figured out if I should turn the rotors or just buy new. I don't want to stick them on the old rotors without at least turning them.

[Bordom]

No special reason, just to save money before I put new pads on. It'll be my third set of pads in 4-ish years, I figure I should swap/machine the rotors as well.

edit: Wait the minimum thickness for the rotor is 2-3mm? You're right that is pretty thin.

No no no, 2-3mm lower than new lol so that would be 23-22mm rotor thickness

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[OverSpun]

Moved to the Tech FAQ Forum-

[GOODBYNAAIR]

D2 A8 BBK:
B5 A4 Calipers
D2 A8 312mm x 25mm rotors 8E0 615 301 R
TT Carriers 1J0 615 125 A
Requires new brake lines?N

Boxster 986 BBK:
Boxster 986 Caliper Rt 986 351 422 03
Boxster 986 Caliper Lt 986 351 421 03
D2 A8 312mm x 25mm rotors 8E0 615 301 R
TT Carriers 1J0 615 125 A or Apikol/PureMS brackets
Requires new brake lines?Y


How does the TT carrier work with the 986? I have the ECS Junk 330mmx25mm rotors (ECS does not make them any more) right now and there larger stg carriers. They hold the caliper to far away from the hub for 312mm A8. I have been waiting on swapping to the PureMS Boxster Caliper Brackets looking for other options. I have a TT sitting in my local yard so if I can use the TT carrier with the 986 caliper and A8 312mm rotor than that saves me alot of $$$$$ If that really bolts up ???

PureMS Boxster Caliper Brackets
[IMG][/IMG]

OEM TT


how does this work?

[demonmk2]

The tt caliper brackets work with factory calipers that came on you a4. It just puts them out so you can use a8 rotors.
Usrt sales a bracket for the 986 just get them for a mk1 TT about 160 shipped.

[GOODBYNAAIR]

Thanks that makes more sense maybe I read it wong. I thought maybe some way to mod the tt carrier or something idk lol.

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[GOODBYNAAIR]

The tt caliper brackets work with factory calipers that came on you a4. It just puts them out so you can use a8 rotors.
Usrt sales a bracket for the 986 just get them for a mk1 TT about 160 shipped.

So then I will need the 312mmx25 TT rotor or is it like all the other 986 carries and I'll need the D2 A8 312x25mm rotor?

[Bordom]

So then I will need the 312mmx25 TT rotor or is it like all the other 986 carries and I'll need the D2 A8 312x25mm rotor?

The second one

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[HUFset]

I’m confused about what is true.
Will the USRT Carrier for a MK1 TT/MK4 work on a B5 A4? vs. Will the OEM TT carrier work on B5 A4 with Boxster/986 calipers?

I’d rather buy the cheapest piece of metal or stick with what I have. I have A8 rotors, stock B5 A4 calipers and OEM MK1 TT carriers on my 2000 B5 A4.

The USRT are $160 w/ hardware, PureMS is $175 w/ hardware and Apikol is $239 w/o hardware.
USRT Carrier link:
http://www.usrallyteam.com/index.php...oducts_id=1893

I'm confused between a few posts in this thread, I think the confusion lies in the OP(updates are below if true).

Below it’s stated that OEM TT carriers won’t work with Boxster calipers but USRT MK1 TT/MK4 will:

The tt caliper brackets work with factory calipers that came on you a4. It just puts them out so you can use a8 rotors.
Usrt sales a bracket for the 986 just get them for a mk1 TT about 160 shipped.

Again it is stated here that USRT TT/MK4 carriers work:

on the 986 bbk (312x25) you can use the usrt mk1 TT brackets/adapters too. I bring it up because they're about 100 bucks cheaper.

OP says OEM TT carriers and Boxster calipers work but also does not mention USRT carriers.

FRONT-
Boxster 986 BBK:
Boxster 986 Caliper Rt 986 351 422 03
Boxster 986 Caliper Lt 986 351 421 03
D2 A8 312mm x 25mm rotors 8E0 615 301 R
TT Carriers 1J0 615 125 A or Apikol/PureMS brackets
Requires new brake lines?Y

Perhaps the OP needs to replace this line:
TT Carriers 1J0 615 125 A or Apikol/PureMS brackets
with this?
USRT MK1 TT/MK4 brackets or Apikol/PureMS brackets

[rockbeau25]

B7 S4 300mm:
B5 S4 Caliper Rt 8D0 615 424 C
B5 S4 Caliper Lt 8D0 615 423 C
or
B6/B7 S4 Caliper Rt 8E0 615 424 C
B6/B7 S4 Caliper Lt 8E0 615 423 C -->grifrowl's B6/B7 S4 caliper D.I.Y<--
B7 S4 300mm x 22mm rotors 8E0 615 601R
Apikol/034 brackets
Requires new brake lines?Y
Confirmed fitment-Centric (Stoptech branded) 950.33005 brake lines

Are Apikol/034 brackets needed only for the B6/7 caliper or are they needed with the B5 caliper as well?

[Mattr567]

I’m confused about what is true.
Will the USRT Carrier for a MK1 TT/MK4 work on a B5 A4? vs. Will the OEM TT carrier work on B5 A4 with Boxster/986 calipers?

I’d rather buy the cheapest piece of metal or stick with what I have. I have A8 rotors, stock B5 A4 calipers and OEM MK1 TT carriers on my 2000 B5 A4.

The USRT are $160 w/ hardware, PureMS is $175 w/ hardware and Apikol is $239 w/o hardware.
USRT Carrier link:
http://www.usrallyteam.com/index.php...oducts_id=1893

I'm confused between a few posts in this thread, I think the confusion lies in the OP(updates are below if true).

Below it’s stated that OEM TT carriers won’t work with Boxster calipers but USRT MK1 TT/MK4 will:

Again it is stated here that USRT TT/MK4 carriers work:

OP says OEM TT carriers and Boxster calipers work but also does not mention USRT carriers.


Perhaps the OP needs to replace this line:
TT Carriers 1J0 615 125 A or Apikol/PureMS brackets
with this?
USRT MK1 TT/MK4 brackets or Apikol/PureMS brackets

I'm doing this and I'm confused also.

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[demonmk2]

the OEM TT carriers work with the stock caliper that comes on the a4 and allows you to use the A8 312mm rotor.
if you want to use 986 bembo calipers you can use the adapter bracket ( for the MK1 TT for the same caliper 986) and will fit the a4 uprights and still using the A8 312mm rotor

Also with S4 uprights you can swap the entire front brake setup from a B6 S4 345mm or am I missing something. its another cheap upgrade over stock.

[rockbeau25]

There has been a few threads lately in regardes to brake upgrades, so I figure I will try to compile a list of both front and rear upgrades so we have everything in one place for ease of future reference.

This list is incomplete as of now, I DO NOT know what is required to run ALL of these setups on both pre-facelift and facelift cars. With the help of the rest of you guys, I hope to complete this list. If anyone has anything to add(part #'s, tips/tricks, other notable setups, etc.), post it and I will edit it into the 1st and 2nd posts.

FRONT-

D2 A8 BBK:
B5 A4 Calipers
D2 A8 312mm x 25mm rotors 8E0 615 301 R
TT Carriers 1J0 615 125 A
Requires new brake lines?N

Boxster 986 BBK:
Boxster 986 Caliper Rt 986 351 422 03
Boxster 986 Caliper Lt 986 351 421 03
D2 A8 312mm x 25mm rotors 8E0 615 301 R
TT Carriers 1J0 615 125 A or Apikol/PureMS brackets
Requires new brake lines?Y

Boxster S BBK:
Boxster S Caliper Rt 996 351 426 11
Boxster S Caliper Lt 996 351 425 11
D2 A8 312mm x 25mm rotors 8E0 615 301 R
or
B5 S4 321mm x 30mm rotors 8E0 615 301 AD
Apikol/PureMS brackets
Requires new brake lines?Y

Porsche 993TT BBK:
993TT Caliper Rt 993 351 426 10
993TT Caliper Lt 993 351 425 10
B5 S4 321mm x 30mm rotors 8E0 615 301 AD
or
Apikol 323mm x 32mm 2-piece floating rotors
or
Mercedes Benz C230 330mm x 28mm rotors 203 421 13 12 *(machine center hub a few mm, and drill lug bolt holes to 14mm) (with corresponding brackets)
or
Volvo V70R/S60R 306 452 22 330mm x 32mm *(open lug holes with a 3/4" bit, and minimal grinding to uprights) (with corresponding brackets)
Apikol/2Bennett brackets
Requires new brake lines?Y
•Notes• A.K.A. Porsche Brembo Big Red/Black found on both 993s and 928GTSs


If you choose to swap to B5 S4 uprights instead of running the brackets. . .



17z 330mm BBK:
17z Caliper Rt Porsche 955 351 422 33/Touareg 7L6 615 124 H/Audi Q7 7L6 615 149
17z Caliper Lt Porsche 955 351 421 32/Touareg 7L6 615 123 T/Audi Q7 7L6 615 150
Mercedes Benz C230 330mm x 28mm rotors 203 421 13 12 *(machine center hub a few mm, drill lug bolt holes to 14mm, and need 2mm Apikol shim or steel washers)
or
Volvo V70R/S60R 306 452 22 330mm x 32mm *(open lug holes with a 3/4" bit, and minimal grinding to uprights)
Apikol 2-piece 330x32mm rotors
Apikol brackets
Requires new brake lines?Y
Confirmed fitment-Centric (Stoptech branded) 950.33005 brake lines

17z 345mm BBK:
17z Caliper Rt???
17z Caliper Lt???
rotors???
Apikol brackets
Requires new brake lines?Y
Confirmed fitment-Centric (Stoptech branded) 950.33005 brake lines

18z BBK:
18z Caliper Rt 7L6 615 150
18z Caliper Lt 7L6 615 149
17z brake pads
Mercedes Benz C32 AMG 345mm x 30mm rotors 203 421 09 12
Apikol brackets
Requires new brake lines?Y
Confirmed fitment-Centric (Stoptech branded) 950.33005 brake lines

B6/B7/B8 345mm BBK:
*Requires B5 S4 upright conversion*
B8 S4 Caliper Rt 8K0 615 124 G
B8 S4 Caliper Lt 8K0 615 123 G
B6/B7 S4 345mm x 30mm rotors 8E0 615 301 T
B8 S4 Carrier Rt 8T0 615 126
B8 S4 Carrier Lt 8T0 615 125
Requires new brake lines?Y/N?

Just adding my recent BBK which is similar to, but not the same as anything on this list.

D2 S8 4 pot Brembos
*I did this with a B6 upright conversion but I believe it could be done without*
D2 S8 Caliper Lt 4D0615107D
D2 S8 Caliper Rt 4D0615108D
B6/B7 S4 345mm x 30mm rotors 8E0 615 301 T
D2 S8 Pads (apparently some D2 S8s came with HP2s, careful to order Brembo pads)
Apikol 993TT brackets (I used B6 to 993tt brackets, may be possible to use B5 A4 to 993tt brackets as well)
Requires new brake lines?Y
StopTech 950.33005 (B7 RS4 lines)

The calipers are similar to 993TT calipers with some slight variations (IIRC they share a part number). As far as mounting goes, they are the same. However, the D2 S8 version can support a larger 345x30mm B6/7 rotor.

[demonmk2]

Has any one wired in a b5 S4 abs sensor into a prefacelift a4 for the brake upgrade when using the uprights?


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[rockbeau25]

Has any one wired in a b5 S4 abs sensor into a prefacelift a4 for the brake upgrade when using the uprights?


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Are you talking about the bolt down style ABS sensors? When I did the B6 upright conversion I used this (4B0927803B). It is bolt down but use the pre-facelift style connector. I simply snipped off the brake pad sensors since our cars don't have that. Only issue I ran into is you need to put a washer between the sensor and the upright so it doesn't interfere with the axle.

[Joe Jr.]

this is a good source of information. you know what would help this thread? photos of the various set ups either finished or in parts. i know i'm asking a lot but after all the replies here and no one has posted pics? just saying....

[chris164935]

Anyone know if 332 rotors will work with the Touareg 17z calipers? That size seems to be the easiest (and cheapest) to find in a 2 piece rotor setup.

[Bordom]

Anyone know if 332 rotors will work with the Touareg 17z calipers? That size seems to be the easiest (and cheapest) to find in a 2 piece rotor setup.

332 what? Porsche?

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[A1 A2 German]

Fronttrak rear conversion specs needed, along with aftermarket big brake options, guy making those plates.

(sparing AZ another random post and compiled it in one master thread).

1) Saw an AZ'r who ditched the odd ball rear, bearing/hub/spacer/disk all in one.....in favor of a true hub with a bearing in it, and individual disk that slipped on that mirrored the front brakes. Maybe off a C5 A6?

2) Saw a new member who had a mini website selling front and rear ~cnc milled brackets for bbk upgrades. Granted he may know and will ask him, I still need to find him.

His kits appeared to be all quattro, so I'd have a double whammy and having to convert to ~mutiple hub, then use his conversion bolted to that to convert to bbk.

[chris164935]

332 what? Porsche?

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Sorry, 332mm size rotors.

[Jam'sAudiFix]

+1

[Jam'sAudiFix]

Fronttrak rear conversion specs needed, along with aftermarket big brake options, guy making those plates.

(sparing AZ another random post and compiled it in one master thread).

1) Saw an AZ'r who ditched the odd ball rear, bearing/hub/spacer/disk all in one.....in favor of a true hub with a bearing in it, and individual disk that slipped on that mirrored the front brakes. Maybe off a C5 A6?

2) Saw a new member who had a mini website selling front and rear ~cnc milled brackets for bbk upgrades. Granted he may know and will ask him, I still need to find him.

His kits appeared to be all quattro, so I'd have a double whammy and having to convert to ~mutiple hub, then use his conversion bolted to that to convert to bbk.

+1 for bracket guys website- I'd like to see it as well.

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[A1 A2 German]

Check it, found it:

Good stuff

https://voshmods.com/collections/frontpage

[Creechy]

The part number for the Frontrack rear hub upgrade is 4A0501653C. You can then upgrade to FL S4 calipers and disc's but you'll need a 10 to 12mm spacer spacer between the carrier and mounting tabs. Another problem with the S4 calipers is you have to mount them upside down due to the parking brake cable on the frontrack mounting from the top.( Bled the caliper off the disc with a windback tool against the piston.)
I've been running S4 calipers with Rs4 carriers with 310mm tts disc's for 2 years ( 345mm S4 fronts ) with exellent results.

[voshmag]

Fronttrak rear conversion specs needed, along with aftermarket big brake options, guy making those plates.

(sparing AZ another random post and compiled it in one master thread).

1) Saw an AZ'r who ditched the odd ball rear, bearing/hub/spacer/disk all in one.....in favor of a true hub with a bearing in it, and individual disk that slipped on that mirrored the front brakes. Maybe off a C5 A6?

2) Saw a new member who had a mini website selling front and rear ~cnc milled brackets for bbk upgrades. Granted he may know and will ask him, I still need to find him.

His kits appeared to be all quattro, so I'd have a double whammy and having to convert to ~mutiple hub, then use his conversion bolted to that to convert to bbk.

Thanks for the shout out guys. Currently all my b5 kits are for Quattro. Kinda stayed away from fwd version because I assumed nobody would who was fwd only would want to upgrade rear brakes.

Who has interest in fwd version?

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[Mattr567]

Fronttrak rear conversion specs needed, along with aftermarket big brake options, guy making those plates.

(sparing AZ another random post and compiled it in one master thread).

1) Saw an AZ'r who ditched the odd ball rear, bearing/hub/spacer/disk all in one.....in favor of a true hub with a bearing in it, and individual disk that slipped on that mirrored the front brakes. Maybe off a C5 A6?

2) Saw a new member who had a mini website selling front and rear ~cnc milled brackets for bbk upgrades. Granted he may know and will ask him, I still need to find him.

His kits appeared to be all quattro, so I'd have a double whammy and having to convert to ~mutiple hub, then use his conversion bolted to that to convert to bbk.

The hub your thinking of its off a C4 100 fwd. B5 fwd and C4 100 fwd share stub axles so thats why it works. I have a set i'll be installing soon. Pretty common at my local junkyard actually. The bearing kits are also the same too apparently, but I would pick the C4 version just to be safe. That plate may work with the C4 hubs, but considering the brake balance (especially on fwd) I dont see the point really besides looks.




B5 Fwd bearing kit:

https://www.blauparts.com/rear-audi-...-kit-1997.html

C4 100 fwd bearing kit:

https://www.blauparts.com/rear-audi-...ehicle_fitment

The part number for the Frontrack rear hub upgrade is 4A0501653C. You can then upgrade to FL S4 calipers and disc's but you'll need a 10 to 12mm spacer spacer between the carrier and mounting tabs. Another problem with the S4 calipers is you have to mount them upside down due to the parking brake cable on the frontrack mounting from the top.( Bled the caliper off the disc with a windback tool against the piston.)
I've been running S4 calipers with Rs4 carriers with 310mm tts disc's for 2 years ( 345mm S4 fronts ) with excellent results.

Yep, thanks for posting in my build thread btw. I'm actually picking up D2/S8 carriers so I can run 280mm rotors. RS4 stuff here is rare and expensive. D2 A8/C5 4.2 carrier is also an option, 269mm rotor. All 3 setups (B5 S4/C5 2.7T, D2 A8/C5 4.2, D2 S8) all share the same caliper and pads, its all just down to the carrier

Could we have some in-depth pics of your rear setup? Would really appreciate it.

[A1 A2 German]

Voshmag, I was going to reach out to you once running, as have to focus on that more then anything. I'm AP Racing up front, for obvious reasons couldn't do a Frankenstein AP Racing meets Brembo meets Wilwood....I'd look into another front AP Racing kit, for the rear, using your Wilwood parking brake (attempting to buff, erase, de-badge the Wilwoods and all colormatched)

All things considered AP Racing kits are simply looking for front oem pick up points (front upright pick up points). The AP Racing kit fit via a B5 adapter bracket, as I see it anyone should be able to use any front B5 orientated blend considering you used front oem spacing/pick up points.

So it would be your full kit minus the Brembos

[Mattr567]

Would also like to add that wheel spacers listed as compatible with the B5 Passat and C4 100 fwd will work on A4 FWD's. I have 10mm H&R's on mine.

Voshmag, I was going to reach out to you once running, as have to focus on that more then anything. I'm AP Racing up front, for obvious reasons couldn't do a Frankenstein AP Racing meets Brembo meets Wilwood....I'd look into another front AP Racing kit, for the rear, using your Wilwood parking brake (attempting to buff, erase, de-badge the Wilwoods and all colormatched)

All things considered AP Racing kits are simply looking for front oem pick up points (front upright pick up points). The AP Racing kit fit via a B5 adapter bracket, as I see it anyone should be able to use any front B5 orientated blend considering you used front oem spacing/pick up points.

So it would be your full kit minus the Brembos

Whats exactly wrong with mixing AP Racing and Brembo? Lol. Unless we could change the brake bias, I don't see how a super big rear setup would help us much. Lot less weight back there too than Quattro. I have AP Racing CP6600 4pot fronts on B5/S4 rotors, so the D2/S8 rear BBK should wrap things up nicely. Plenty big and the rotor is vented.

I hate that wack fwd integrated rotor thing

[A1 A2 German]

Thanks for the info.

It's not that I "have too" place an front AP Racing kit in the rear (that oversized), it's that maybe my only option....unless I start looking into maybe other platforms...aka don't believe there was a rear A4 B5 Quattro AP Racing to tinker with. S4 perhaps

Yet...if there's the kit then it erodes the need for this kit as is the kit for adding large rear brakes in addition to adding the C4 gear

[Mattr567]

Thanks for the info.

It's not that I "have too" place an front AP Racing kit in the rear (that oversized), it's that maybe my only option....unless I start looking into maybe other platforms...aka don't believe there was a rear A4 B5 Quattro AP Racing to tinker with. S4 perhaps

Yet...if there's the kit then it erodes the need for this kit as is the kit for adding large rear brakes in addition to adding the C4 gear

The Brembo Touraeg caliper should work fine ¯\_(ツ)_/¯ Found this but its over twice what I paid for my front BBK: https://www.ebay.com/itm/AP-Racing-R...4383.l4275.c10

Either way the C4 hub would be needed to run any rear fwd BBK. Idk how the caliper spacing has exactly changed vs Quattro since S4 calipers are bolt on for them, but I have a feeling ill need to do a lot of tinkering to get everything right for the S8 setup.

[Mattr567]

Another problem with the S4 calipers is you have to mount them upside down due to the parking brake cable on the frontrack mounting from the top. (Bled the caliper off the disc with a windback tool against the piston.)

Had another thought about this. I was looking at both rear calipers and the parking brake assemblies appear to be almost the same design, just flipped around like stated in bold. BUT the thing is they appear to mount the same. So, in theory, you could just bolt the FWD parking brake assembly onto the S4 caliper? That way you can avoid this problem entirely.

A4 FWD Left


S4 Left


D2 for shits and giggles, completely diffrent parking brake system

[Creechy]

I think the arm for the parking brake would then need to be swapped side for side along with the mechanism so that it's pulled in the correct direction.
Far easier would be to mount the caliper the same way up as the Quattro and re-route the parking brake cable from below, should just need a bracket to hold the cable in place. I might revisit this at some point.
I'll post some pic's next time I've got the wheel off.

[SaintPaulyBoy]

Dont the ATE G60's with 320mm x 25mm discs plus A6 carriers also work for front?

anyone ????

[Pdaniel8]

One question about 288 to 312 upgrade with TT carriers. Do I keep the same 288mm pads, or do I have to use different pads for the 312mm setup?

[Mattr567]

One question about 288 to 312 upgrade with TT carriers. Do I keep the same 288mm pads, or do I have to use different pads for the 312mm setup?

Same pads, same caliper. The advantage (IIRC) is the bigger rotor allows heat to be dispersed easier/faster so less fade over time/hard use.