A5 Brake Rotor size up - Audi A5 Forum & Audi S5 Forum
 
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post #1 of 15 Old 23rd July 2011, 12:23 PM Thread Starter
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A5 Brake Rotor size up

Hi,

I wonder if it is possible to upgrade A5 Brake rotor to S5's rotor or not.

S5's rotor is a little bit bigger in diameter and heavier in Weight.

If possible, do I have to change Brake Pad and Caliper too?


Thank you,

James.

===========================================

Here are some data:

A5's Front size
Outer Dia. 320.0mm
Height. 52.0mm
Nom Thick 30.0mm
Min Thick 28.0mm
Hub Size 68.0mm
Bolt Size 15.3mm
Bolt Circle 5x112.0mm
Weight 21.7 lbs.

S5's Front size
Outer Dia. 340.0mm
Height. 51.9mm
Nom Thick 30.0mm
Min Thick 28.0mm
Hub Size 68.0mm
Bolt Size 15.2mm
Bolt Circle 5x112.0mm
Weight 23.65 lbs.

A5's Rear size
Outer Dia. 300.0mm
Height. 36.0mm
Nom Thick 12.0mm
Min Thick 10.0mm
Hub Size 68.0mm
Bolt Size 15.3mm
Bolt Circle 5x112.0mm
Weight 12.2 lbs.

S5's Rear size
Outer Dia. 330.0mm
Height. 36.1mm
Nom Thick 22.0mm
Min Thick 20.0mm
Hub Size 68.0mm
Bolt Size 15.2mm
Bolt Circle 5x112.0mm
Weight 17.1 lbs.
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post #2 of 15 Old 24th July 2011, 12:28 AM
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Quote:
Originally Posted by Jkim15 View Post
Hi,

I wonder if it is possible to upgrade A5 Brake rotor to S5's rotor or not.

S5's rotor is a little bit bigger in diameter and heavier in Weight.

If possible, do I have to change Brake Pad and Caliper too?


Thank you,

James.

===========================================

Here are some data:

A5's Front size
Outer Dia. 320.0mm
Height. 52.0mm
Nom Thick 30.0mm
Min Thick 28.0mm
Hub Size 68.0mm
Bolt Size 15.3mm
Bolt Circle 5x112.0mm
Weight 21.7 lbs.

S5's Front size
Outer Dia. 340.0mm
Height. 51.9mm
Nom Thick 30.0mm
Min Thick 28.0mm
Hub Size 68.0mm
Bolt Size 15.2mm
Bolt Circle 5x112.0mm
Weight 23.65 lbs.

A5's Rear size
Outer Dia. 300.0mm
Height. 36.0mm
Nom Thick 12.0mm
Min Thick 10.0mm
Hub Size 68.0mm
Bolt Size 15.3mm
Bolt Circle 5x112.0mm
Weight 12.2 lbs.

S5's Rear size
Outer Dia. 330.0mm
Height. 36.1mm
Nom Thick 22.0mm
Min Thick 20.0mm
Hub Size 68.0mm
Bolt Size 15.2mm
Bolt Circle 5x112.0mm
Weight 17.1 lbs.
Yes, it can be done but you need to change the calipers and pads: also you might have to change the wheels if you aren't running 18" rims as 17" wheels will be too tight for the S5 brakes (an S5 was never designed to run 17" rims hence larger rotors whereas some A5s do run 17" wheels....)

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post #3 of 15 Old 24th July 2011, 02:08 AM
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That's not true, at least with the v6 engine A5s...

The v6 A5 has the same brake calipers as the S5, being the only difference between their brakes the size of the discs and the callipers holders which are bigger, so if you have a v6 A5 you would only have to buy the S5 discs and calipers holders to upgrade it...
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post #4 of 15 Old 24th July 2011, 03:11 AM
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Quote:
Originally Posted by labombadiesel View Post
That's not true, at least with the v6 engine A5s...

The v6 A5 has the same brake calipers as the S5, being the only difference between their brakes the size of the discs and the callipers holders which are bigger, so if you have a v6 A5 you would only have to buy the S5 discs and calipers holders to upgrade it...
Sorry that's not truth.

A5 3.0TDI front calipers and pads nr.:

8K0 615 123B/124B, 8K0 698 151E

S5:
8T0 615 123B/124B, 8K0 698 151D

so they are different.

Rear calipers and pads are different due to disc thickness and diameter.

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post #5 of 15 Old 25th July 2011, 06:40 AM
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The difference in the S5 and V6 TDi or Non-TDI is that the caliper has a black S5 sticker on it, other than that all calipers are the same on the front.
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post #6 of 15 Old 22nd October 2011, 11:29 AM
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Sorry for late reply but is it 100% true that S5 calipers are same to A5 3.0TDI's apart from color?

I consider replacing my 2.0TFSI's 320mm rotors to 345mm and it's important to understand if I may leave stock calipers intact, replacing just carriers/rotors/pads.

Last edited by Tomcat-R; 22nd October 2011 at 11:34 AM.
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post #7 of 15 Old 22nd October 2011, 11:33 AM
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Quote:
Originally Posted by C99 View Post
Sorry that's not truth.

A5 3.0TDI front calipers and pads nr.:

8K0 615 123B/124B, 8K0 698 151E

S5:
8T0 615 123B/124B, 8K0 698 151D

so they are different.

Rear calipers and pads are different due to disc thickness and diameter.
C99, would you please share the PR code of your 3.0 TDI front brakes according to ETKA?

Many thanks!
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post #8 of 15 Old 25th October 2011, 05:10 AM
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This are the official type and sizes of A5 3.0 TDI and S5 brakes...

Front and rear...

The only difference between both is the disc size, and accordingly the caliper carrier.
The rest is exactly the same.
This is official technical Audi information for the spanish dealers...

Tha data are:
Engine
Minimum wheel size
Brake type
number of brake pistons
brake piston diammeter
brake disc diammeter
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Last edited by labombadiesel; 25th October 2011 at 05:13 AM.
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post #9 of 15 Old 25th October 2011, 07:20 AM
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Quote:
Originally Posted by labombadiesel View Post
This are the official type and sizes of A5 3.0 TDI and S5 brakes...

Front and rear...

The only difference between both is the disc size, and accordingly the caliper carrier.
The rest is exactly the same.
This is official technical Audi information for the spanish dealers...

Tha data are:
Engine
Minimum wheel size
Brake type
number of brake pistons
brake piston diammeter
brake disc diammeter

Thanks! It actually means 3.0TDI has 320 / 300 mm rotor setup, not 345 / 330 mm?
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post #10 of 15 Old 30th October 2011, 09:03 AM
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Yes, that's right...
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post #11 of 15 Old 30th October 2011, 09:36 AM
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does this hold true for the 3.2 V6 as well?
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post #12 of 15 Old 30th October 2011, 09:01 PM
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Yep.
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post #13 of 15 Old 30th October 2011, 10:21 PM
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Quote:
Originally Posted by labombadiesel View Post
Yes, that's right...
Searching in ETKA and TRW Aftermarket catalog has revealed several interesting facts:

1. Audi Q5 SUV has two front brake setups - 1LA and 1LJ

- 1LA is similar to A5 - rotor, caliper carrier p/n's are same

- 1LJ is similar to S5 - rotor p/n is the same, caliper carrier p/n's are different (due to color)


2. Audi Q5 has same front caliper p/n's for both setups - 1LA and 1LJ


Applying some logic to the abovementioned facts brings to the following:

- front calipers are interchangeable between 1LA and 1LJ setups

- Q5 has same caliper carriers as S5, but in gray color

Last edited by Tomcat-R; 31st October 2011 at 06:51 AM.
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post #14 of 15 Old 13th August 2012, 11:37 AM
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Sorry to dig this topic up

Just wanted to see if anyone had any input.

I have a 2.0T and going to be putting on a 380 bbk on the front and wanted slightly larger rears.

As stated above the s5 rear rotor is 22mm and the a5 is 12mm. Are the s5 and the a5 caliper the same? I will be getting larger caliper carriers to accomodate the 330 vs. 300 size rotors but how would the width of the rotor affect it? (I checked hawk performance and the pads have the same part number for an a5 and s5)

Thanks

Last edited by ubiquitous; 13th August 2012 at 11:48 AM.
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post #15 of 15 Old 13th August 2012, 09:08 PM
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Hi ubiquitous,

wow that is some huge front BBK.

i think the rear S5 and A5 are different in terms of thickness of the brake rotor.

i know that you can change the rotors of S5 to the RS5 and still retain the same calipers but not for the A5 to the S5.

i upgraded my front and Rear Brakes to the RS5 types hence i had to change the whole lot, rotors and calipers.

hope this helps.

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