B8 brakes / q7 18z calipars

[Kustomimports]

Ok guys, I bought the 18z calipars and pads. Tryed to install these lastnight and realized I need different rotors. Does anyone know which rotors I need to run with these calipars on my b8 s4?

[theswoleguy]

Q7 brakes or Q5? Didn't know q7 brakes bolted on

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[s4matty]

Ya Q7 bolt on but not sure on the rotor..I run the 18z (Q7) with b7 s4 rotors on my c5 all road

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[colby7]

I believe the Q7 has a different bolt pattern.

[redline380]

Something 350mm. I believe ml55 rotors are popular with that caliper. Nit sure how the offset works for you. As noted, q7 is 5x130 so those rotors will not work

[jrivera]

I have a set of rotors if you want measurements

[Kustomimports]

Yes please! I'd like to get this swap done!

[lapsandwich]

Porsche Macan rotors are 350mm and are the correct bolt pattern 5x112. Just wondering about the offset though..

[jrivera]

What measurements?

[LINDW4LL]

I'm surprised you were able to bolt these up. Some before you tried and reported that the caliper body contacted the upright. Thus, I don't believe there are any B8 owners who've actually run this setup yet, and you'll need to make some calculations or test to find a rotor with the proper offset.

As far as rotor options, you could look into the MB GL450 (350x32) and ML55 AMG (345x32) rotors.

[infinkc]

Almost positive they don't bolt up. I think only the 19z work with brackets on the b8.

[Kustomimports]

18z calipars as well as 19z calipars have the same distance in bolt holes. They bolt up.

[LINDW4LL]

18z calipars as well as 19z calipars have the same distance in bolt holes. They bolt up.

Yes, the bolt spacing is correct, but people report the caliper body hits the upright.

Have you actually physically mounted them to the car yet?

[Kustomimports]

I'll do it over the weekend and let you all know... I might of found a oem rotor that will work also.

[jpfour]

I'll do it over the weekend and let you all know... I might of found a oem rotor that will work also.

Hi OP Did you get chance to try the 18z's or any pictures this weekend?

[Kustomimports]

The calipars bolt up with minor timing to the heat sheild. The rotor I'm testing this week. Had to order some

[jpfour]

Cool, I'll try and pick a set up should be a nice conversion for pedal feel and possibly a thicker disc..... Any pictures would be appreciated

[lapsandwich]

Where the pics attttttt?! And what rotors are you using?

[lowjonathan]

The calipars bolt up with minor timing to the heat sheild. The rotor I'm testing this week. Had to order some

nice...

18z bolt up directly...

sub for the rotor fit up...

thanks

[PhilM]

Great work, keep us posted on the rotors!

[lapsandwich]

Hey OP, what rotors did you order ?

[jpfour]

I'm not the OP but some maths and a lot of hunting through specs made me think that GL500 rotors might be close
Screenshot in the link

https://www.dropbox.com/s/6ju1clr9k6...14954.png?dl=0

Would love to know if they do fit, if the calipers can be mounted I'm going to order some and try.....

[Li ls4]

Definitely interested in the outcome of this. I've been trying to get myself to buy the q5 calipers but if the q7s work I'd rather get those

[lapsandwich]

I'm a little confused exactly on what I should be basing the rotor offset on. The q7's offset ? Of the s4 ?

[LINDW4LL]

I'm a little confused exactly on what I should be basing the rotor offset on. The q7's offset ? Of the s4 ?

You'd want to measure the difference between where the center of the 18Z calipers sits (when mounted) in comparison to the stock caliper, and then adjust the rotor offset/height accordingly.


---

A little very quick math. For the B7 S4 (which uses the same caliper as the B8), the rotors for 18Z had a rotor offset/height that was 3.7mm more than the stock rotor, for reference.

47.3 was the stock rotor height, ML55s (primary 18Z rotor choice) is 51mm.

For the B8, the stock rotor height is 51.9mm, so maybe something around 55-56mm height?

The GL550 rotor is 54.8, so in the ballpark. That may be the same as the GL500 one that was mentioned above. He's on the right track.

[jpfour]

That's exactly how I drew my conclusion GL500 rotors are a 55mm height

[lapsandwich]

Ohhhhhhh okay. That makes a lot more sense. I'm really
Hoping the OP throws a picture up of the calipers mounted for a little confirmation on the fitment. Z18s are relatively easy to source and the price is a little better then the Q5 four Pistons.

[Kustomimports]

Sorry guys yes I'll post pictures. The calipars bolt up. But the project is on hold atm. Something came up. I'm still on it tho give me a week or 2. A 2010 cl 600 rotor looks like it will do the job. I'll order one and double check it in a week or so.

[jpfour]

Sorry guys yes I'll post pictures. The calipars bolt up. But the project is on hold atm. Something came up. I'm still on it tho give me a week or 2. A 2010 cl 600 rotor looks like it will do the job. I'll order one and double check it in a week or so.

cant wait for pictures........ slightly excited lol

[lapsandwich]

What about having the q7 rotor redrilled for 5x112

[LINDW4LL]

No, Q7 has totally different hubs and the fitment is much different.

[lowjonathan]

any updates on the rotor used?

[SR7D1]

Does anyone make an adapter for the 18Z that you can buy seperatley? For the B8.

[pcardenas]

I have a q7 and always look "hugry" the front calipers with 3 pistons. These are 18Z ?????? will fit directly on our B8 S4 front?????

[SR7D1]

I have a q7 and always look "hugry" the front calipers with 3 pistons. These are 18Z ?????? will fit directly on our B8 S4 front?????

OK, so the 18Z caliper fits, the 19Z needs the adapter? But the 18Z needs a special rotor that the OP is attempting to source? Got it. Sorry for my confusion, trying the source a BBK for less than $2K ahs me all confused!

Has the OP contaced Adam for rotor options?

[s4matty]

OK, so the 18Z caliper fits, the 19Z needs the adapter? But the 18Z needs a special rotor that the OP is attempting to source? Got it. Sorry for my confusion, trying the source a BBK for less than $2K ahs me all confused!

Has the OP contaced Adam for rotor options?

I have a set of 18z calipers with b7 s4 rotors if your thinking of doing the swap..

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[SR7D1]

I have a set of 18z calipers with b7 s4 rotors if your thinking of doing the swap..

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Sent you a PM

[UkuRiSh]

Awesome thread, I'm glad someone start this! I was planning do that too.

[SR7D1]

I have a set of 18z calipers with b7 s4 rotors if your thinking of doing the swap..

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Sent you a PM the other day.

[rcaro900ss]

I don't think B7 S4 rotors are going to fit the B8 S4. The center bore on the B8 S4 is 66.6 mm and the B7 is 57.1 mm.