Upgrading rear brakes...

[AUDILUX]

I just had a 332 stoptech bbk installed on my car and was thinking about rear brakes. Has anyone paired up a set of bigger brakes in the rear w/ a stoptech 332 setup in the front? 2004 Eurotuner had a couple of examples, with one guy (best stopping distance of the lot) running S8 rear brakes. Just wondering if there were any other examples.

[Rated S]

Stasis has a rear brake upgrade.

[W1CK3D]

The S8 upgrade is kinda common, thats what I'd look into but I'm sure someone can point you toward more info

[cleveland222]

i have the ECS rear brake upgrade because the rotors were slightly larger than the S8 and Stasis options. They all use the stock caliper. I love the kit I went with.

[Jesse S.]

Stasis has a rear brake upgrade.

Getting this along with the Monobloc6 355mm kit.

Can't wait!

[revhards4]

from my research alot of people have had excellent results with the s8 rear paired up with the stoptech 332 front...eventually will be my setup also

[AUDILUX]

from my research alot of people have had excellent results with the s8 rear paired up with the stoptech 332 front...eventually will be my setup also

Have you tried this setup yet? I need new rear brakes ASAP. Trying to figure out what to go with.

[BlkdoutS4]

034 has a kit to use b7 s4 rear rotors and its only $300 bucks. includes rotors, ss lines and the adapter bracket to keep the stock caliper...

[s2the4]

034 has a kit to use b7 s4 rear rotors and its only $300 bucks. includes rotors, ss lines and the adapter bracket to keep the stock caliper...

2nd that I have the 034 rear b7 conversion and it's great no compliants!

[Raacerx]

I bought everything needed for the 034 rear conversion cause it was cheap, but think I will put my money towards other things. If you want the setup, minus the rear brake lines, I'll sell it for $200; rotors and brackets. 300mm rotors and brackets to use your stock S4 calipers.

[AUDILUX]

Dr. Z just dropped some knowledge on me....

Using a move-out kit in the rear is a mistake. As part of StopTech's BBK optimization process, they try to shift some of the work of braking to the rear. They have a series of tests that tell them if they're going too far and they push it as much as is practical. See: http://www.zeckhausen.com/Testing_Brakes.htm. I know it's counterintuitive to think the balance on your brakes shifter rearward after you installed a FRONT big brake kit. But the purpose of the BBK was to increase thermal capacity in front, not to increase front brake torque.

Now if you go and install a larger rear rotor and relocate the stock rear caliper with a taller mounting bracket, you're increasing the lever arm, and thus the rear brake torque, by an amount equal to the change in effective radius. You may push your car into the unstable braking range shown on the graph at the link I provided above.

If you go through with this move, you're going to want to attempt to compensate for the increase in rear brake bias by using a very low friction rear pad. I would not suggest the Axxis ULT for the street, but would instead use a low dust pad such as Assis Deluxe or Centric Posi Quiet Ceramic.

Thoughts?

[alexverve]

if u go 332mm Stoptech, do not bother with rear. no need to get anything bigger. if u go anything above (355mm) get a B6/7 rear 300mm rotor with 034 braket - cheaper alternative to any Stoptech/Stasis Rear BBK's. In any setup u use on the track, u have to have rear pads at least 1 level softer than fronts.
That is my opinion.

PS: i heard about front Porsche's BBK's screwing up the balance under heavy/track use from few people before.

[BlkdoutS4]

I bought everything needed for the 034 rear conversion cause it was cheap, but think I will put my money towards other things. If you want the setup, minus the rear brake lines, I'll sell it for $200; rotors and brackets. 300mm rotors and brackets to use your stock S4 calipers.

i'll take it

[Sigma 3]

if u go 332mm Stoptech, do not bother with rear. no need to get anything bigger. if u go anything above (355mm) get a B6/7 rear 300mm rotor with 034 braket - cheaper alternative to any Stoptech/Stasis Rear BBK's. In any setup u use on the track, u have to have rear pads at least 1 level softer than fronts.
That is my opinion.

PS: i heard about front Porsche's BBK's screwing up the balance under heavy/track use from few people before.

What are you basing this on?

[alexverve]

What are you basing this on?

the guy above posted this comparison, 332 kit does not change front bias too much.
http://www.zeckhausen.com/Testing_Brakes.htm

plus this table in the middle:
http://www.audizine.com/forum/showth...ht=rear+brakes

[quickaudi]

Dr. Z just dropped some knowledge on me....

Using a move-out kit in the rear is a mistake. As part of StopTech's BBK optimization process, they try to shift some of the work of braking to the rear. They have a series of tests that tell them if they're going too far and they push it as much as is practical. See: http://www.zeckhausen.com/Testing_Brakes.htm. I know it's counterintuitive to think the balance on your brakes shifter rearward after you installed a FRONT big brake kit. But the purpose of the BBK was to increase thermal capacity in front, not to increase front brake torque.

Now if you go and install a larger rear rotor and relocate the stock rear caliper with a taller mounting bracket, you're increasing the lever arm, and thus the rear brake torque, by an amount equal to the change in effective radius. You may push your car into the unstable braking range shown on the graph at the link I provided above.

If you go through with this move, you're going to want to attempt to compensate for the increase in rear brake bias by using a very low friction rear pad. I would not suggest the Axxis ULT for the street, but would instead use a low dust pad such as Assis Deluxe or Centric Posi Quiet Ceramic.

Thoughts?

ask StopTech their opinion

[wdbdy2000s4]

kinda OT, but do the 355s use the same rotor hats as the 332s? They both use st40 calipers.

[ajb_unc]

I would think they do use the same rotor hat since your manufacturing goes up using two different rotor hat sizes. The way they get you is using different adapters for the calipers. That can easily be tweaked if you have a machine shop ;-)

[drewski]

kinda OT, but do the 355s use the same rotor hats as the 332s? They both use st40 calipers.

no. different hats as well as different caliper brackets.

[AUDILUX]

Thinking of dropping $$$$ on the Stoptech rear BBK. I know it won't make much of a difference in actual stopping distance, but I hate the way the tiny s4 rotors look under my 19 inch wheels!

[Justin:NorCal]

Get the rears, I am getting them to pair with my new Stoptech 332 fronts.

[Buzzkillington]

been running the AP front kit with 034 rear kit for awhile now.

no braking instability.

[AUDILUX]

Get the rears, I am getting them to pair with my new Stoptech 332 fronts.

Got any hookups? Best price I can get for them is $3k +shipping.

[audispeed]

you cant get the fronts and then just add the rears later. from what i recall, the front calipers are different for the 2 wheel and 4 wheel kit.

[AUDILUX]

you cant get the fronts and then just add the rears later. from what i recall, the front calipers are different for the 2 wheel and 4 wheel kit.

Incorrect. Stoptech doesn't sell their front and rear BBKs as a 4 wheel kit. They designed the rear BBK to work w/ their front BBKs and sell them seperately.

From their website:
Direct Bolt-on for Existing StopTech Customers
StopTech’s new rear system is a direct bolt-on for existing B5 S4 customers with a StopTech front 355mm or 332mm kit, including both ST-40 and ST-60 variants.OE pads.

http://www.stoptech.com/company_info/news/S4Rear.shtml

[Justin:NorCal]

Got any hookups? Best price I can get for them is $3k +shipping.

Yes, I am able to get them significantly less than that but out of respect to my supplier and out of respect to sponsors on here I don't want to give up their identity.

I would be happy to pass on a business card that might be of assistance. Email me if you are interested.

[1FastS4.Com]

Getting this along with the Monobloc6 355mm kit.

Can't wait!

i am just waiting on my front rotors...

[Turbo Nerd]

034 has a kit to use b7 s4 rear rotors and its only $300 bucks. includes rotors, ss lines and the adapter bracket to keep the stock caliper...

Yea 034 is a bang for a buck, going with stasis, stoptech, or brembo is a waste of money. Most of your braking comes from the front so you really dont need something amazing. Unless your a guy that likes rolling in reverse going 100 then yea go with the big boys. <- Being sarcastic

[alexverve]

Yea 034 is a bang for a buck, going with stasis, stoptech, or brembo is a waste of money. Most of your braking comes from the front so you really dont need something amazing. Unless your a guy that likes rolling in reverse going 100 then yea go with the big boys. <- Being sarcastic

3/4 people on this board will never use stock HP2's with good pad to the limit, but it does not stop them from spending thousands on BBK's. so nothing surprises me anymore. to everyone their own.

[AUDILUX]

Yea 034 is a bang for a buck, going with stasis, stoptech, or brembo is a waste of money. Most of your braking comes from the front so you really dont need something amazing. Unless your a guy that likes rolling in reverse going 100 then yea go with the big boys. <- Being sarcastic

Two words, 'brake bias'. Going with a set of BBKs designed specifically for our vehicle is not a waste of money. If you want to make your car unstable, that's your right though.

[alexverve]

Two words, 'brake bias'. Going with a set of BBKs designed specifically for our vehicle is not a waste of money. If you want to make your car unstable, that's your right though.

i am sorry, but 332mm Stoptech is not really BBK in my opinion. it is not much bigger than stock, nor is clamping power is much different. u get slightly better pedal feel and slightly better heat resistance. all in all, u r only going extra 11mm in total diameter. 355mm or higher is a different story.

[wdbdy2000s4]

so does the stasis 328 kit not count either because it is smaller than the stoptechs?

[alexverve]

so does the stasis 328 kit not count either because it is smaller than the stoptechs?

it is for A4 with 288mm fronts. not for S4 with 321mm. the "gain" in performance does not justify the price.

both 332mm Stoptechs and 328 Stasis were made as BBK for B5 A4 in order to fit 16" stock rims. they just fit S4 cause of same setup.

[AUDILUX]

it is for A4 with 288mm fronts. not for S4 with 321mm. the "gain" in performance does not justify the price.

Do you have any real world data? Or are you just guessing???

[alexverve]

Do you have any real world data? Or are you just guessing???

The question is, do u have a proof that 332mm Stoptech kit will "outbreak" stock HP2's with good pad and a fresh brake fluid? u r spending $1,600-2,000on a new set. u r signing up yourself for a lifetime supply of $600+ rotors, and caliper rebuilds every 2 years...
r u a proffesional racer? do u track your car at least 6-10 times a year in Advance groups? if not, then tell me again, why do u need it? cause it is nice and red and saith something on it? looks nice under your big rims no doubt, but real world use?

[AUDILUX]

The question is, do u have a proof that 332mm Stoptech kit will "outbreak" stock HP2's with good pad and a fresh brake fluid? u r spending $1,600-2,000on a new set. u r signing up yourself for a lifetime supply of $600+ rotors, and caliper rebuilds every 2 years...
r u a proffesional racer? do u track your car at least 6-10 times a year in Advance groups? if not, then tell me again, why do u need it? cause it is nice and red and saith something on it? looks nice under your big rims no doubt, but real world use?

I can tell you honestly from just driving on the street that the upgrade in front brakes to stoptech was a big improvement in pedal feel. Also, everyone knows that the S4 rotors fade quickly. If you do any spirited driving, you will appreciate the upgrade to a bbk.

[Shomegrown]

The question is, do u have a proof that 332mm Stoptech kit will "outbreak" stock HP2's with good pad and a fresh brake fluid? u r spending $1,600-2,000on a new set. u r signing up yourself for a lifetime supply of $600+ rotors, and caliper rebuilds every 2 years...
r u a proffesional racer? do u track your car at least 6-10 times a year in Advance groups? if not, then tell me again, why do u need it? cause it is nice and red and saith something on it? looks nice under your big rims no doubt, but real world use?

In single stops, a BBK probably won't help.

In fact, the STOCK S4 won the single stop braking distance event during one of the S4 shootouts a few years ago with all the modded cars sporting $$$ BBK's. I think it was one of the European Car events.

[Justin:NorCal]

The question is, do u have a proof that 332mm Stoptech kit will "outbreak" stock HP2's with good pad and a fresh brake fluid?

I used to work at STaSIS and I have had both a StopTech 332 front kit and an Alcon 328 front kit. I can in fact tell you from race tested data and experience that the BBK (both) will outperform the HP2 setup. The purpose of a BBK is primarily heat dispersion. Go do 2 laps of infineon, laguna seca, thunderhill with all three brake setups on the same car and let me know which works best ;)

[alexverve]

I used to work at STaSIS and I have had both a StopTech 332 front kit and an Alcon 328 front kit. I can in fact tell you from race tested data and experience that the BBK (both) will outperform the HP2 setup. The purpose of a BBK is primarily heat dispersion. Go do 2 laps of infineon, laguna seca, thunderhill with all three brake setups on the same car and let me know which works best ;)

i've been doing Watkins Glen and Pocono's International with HP2's for 4 years now. used HP+ pads, now up to Blues. no issues. If i was to go BBK, 355mm is the way. 328/332 is not worth the price in my opinion. either all the way or nothing. if u want something cheap in terms of heat dispersion, go B6/7 345mm.

[Slave IV]

i've been doing Watkins Glen and Pocono's International with HP2's for 4 years now. used HP+ pads, now up to Blues. no issues. If i was to go BBK, 355mm is the way. 328/332 is not worth the price in my opinion. either all the way or nothing. if u want something cheap in terms of heat dispersion, go B6/7 345mm.

I agree with the all or nothing statement (unless fitment is an issue and you get a great deal)...also, a lot of the "tests" people do are with different pads and conditions so they aren't really valid "tests"...