Passat B8 BiTDI retrofited to front RS3 370mm BREMBO brakes .

   #1  

@DRI@N

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Hello,

From about six months I put to my car Passat B8 a new pair of front brake from Audi RS3 8P 370mm (4 piston caliper) and i have a small problem after my opinion .

The problem I have with the new RS3 brakes is :
When I go with 40 km/h and I'm obliged to put a BRUTAL BREAK the ABS pump do nothing (the front wheels it effective locks them) .

Now my question is :
It is possible to do with VCDS a coding / adaptation on ABS PUMP to know the pump that I upgraded the front brakes ??

I mention that at higher speeds the wheels do not lock on brutal brakes !!!
I apreciate any advice from yours !!!

Thanks,
Best regards .
 
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downtime

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Yes, you need to code the ABS pump to accomodate for the bigger brakes. Somnus has a link to his excellent ABS coding excel in his signature.
 
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@DRI@N

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@downtime

Thanks for your info .
I download the excel document from Somnus signature but I'm not so sure what byte to change !!!

If you know what byte to modify you find below my VCDS details :
-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104) Labels: 5Q0-907-379-IPB-V1.clb
Part No SW: 3Q0 907 379 H HW: 3Q0 907 379 H
Component: ESC H34 0906
Revision: 00000000 Serial number: 42044000000257
Coding: 0EEC6B8F54200B6C0779070941CA6970D62AD0E0E08296F5B86250F8CAA9
Shop #: WSC 08601 003 1048576
ASAM Dataset: EV_Brake1UDSContiMK100IPB 034001
ROD: EV_Brake1UDSContiMK100IPB_034_VW37.rod
VCID: 3FD84B3167F2F5BFF33-806A

No fault code found.
-------------------------------------------------------------------------------
Thanks,
Best regards
 
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darkchina811

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brake calipers have no electronics and the car doesn't know you replaced them. how did it brake before the swap?

I am just curious. I upgraded my front brakes and I have driven a couple of weeks before changing the ABS coding. no difference whatshowever...
 
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@DRI@N

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Before the swap the brake work perfect, like a normal standard brake !!!

Now the BREMBO's block the wheel when I have the speed below 40 km/h and I put the BRUTAL BRAKE (for example when the pedestrian crossing the road without being assured) and I am obliged to STOP the car .
If I have speed over 40 km/h (for example 80 or more) the brake work perfect NOT BLOCKING the wheel when I brake (but I didn't a test with a BRUTAL BRAKE at that speed) !!!

Your car what kind of brakes has ???
 
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darkchina811

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I upgraded discs from 288mm to 312mm but calipers are the same... but mine was a factory upgrade, I mean the Golf exists with both options.

RS3 brakes on Passat are not a factory upgrade I believe, although you might look for RS3 scans and check ABS bytes 4/17 for front and 14/22 for rear... provided it's the same ABS family and that car has the brakes you installed.
 
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@DRI@N

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You make referring to bytes 4 & 17 from long coding or the byte after accesing long coding helper ???
 
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Somnus

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From what I know about the RS3 Controller, Byte 4 is set to D4 and Byte 17 is set to 2B on cars with 370x34mm (PR. 1LH, 1LL) Front Brakes.

However, i'm not sure if that will be accepted on a 3Q0 Module, since the RS3 uses an 8V0 module, and they have some differences in their coding.

If you want to give it a try, here is your ABS code with the front brake bytes changed to RS3 coding.

DISCLAIMER: As this is a completely unknown change (to me at least), I can't guarantee that the following code will be accepted or have the desired effect.

Code:
0EEC6B8FD4200B6C0779070941CA6970D62BD0E0E08296F5B86250F8CAA9
 
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brake calipers have no electronics and the car doesn't know you replaced them. how did it brake before the swap?

I am just curious. I upgraded my front brakes and I have driven a couple of weeks before changing the ABS coding. no difference whatshowever...

Adrian has different brake calibers and those will make the difference.

My assumption is that with the coding change the brake pressure is controlled in a different way.
 
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@DRI@N

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Somnus I try tomorrow to recode the ABS module with the code given to you !!!
 
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@DRI@N

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Hy Somnus .

I revert with a bad news .
Unfortunately your coding was not accepted by my ABS Module .
I think is necessary to be replaced my ABS module with an module from RS3 !!!
But I don't know if the module from RS3 is compatible with MQB PLATFORM (PASSAT B8) !!!

Momentanly I keep this module because I think an RS3 module is very expensive, and I don't have any information about compatibility !!!

Best Regard,
And thanks for try to help !!
 
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siLc

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Changing the ABS is anyway a rabbit hole in this case. Why did you use brakes from the older PQ platform RS3 8P when theres a MQB platform RS3 8V in existence? You could get the ABS off the latter but how nice it will play with rest of the car is anybody's guess.
 
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@DRI@N

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Hy,

I put these RS3 8P brakes, because I found them at that time at a reasonable price !!!
After my opinion to pay 600 Euro for used 4 piston calipers and a brand new OEM rotors and new brembo brake pads I presume is a reasonable price !!!

And the second thing that made me choose these RS3 8P brakes was the 18 "winter wheels, which were already purchased and are new.

And I think the 8V brakes with 6 piston caliper and 370x34 mm wave rotors wasn't have enough space unde the 18" winter wheels !!
 
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Most likely the front brake bytes are not the same on 8V0 ABS vs. 5Q0 or 3Q0. If you look carefully at the autoscans, byte 4 mirror is infact byte 19 on 8V0 whereas on 3/5Q0 the mirror byte for byte 4 is 17.

I have to say that I'm not even sure if the 3/5Q0 ABS blocks support multipiston brake calipers. The default calipers only have single piston. I tried to Google if there are any upgrades and there seems to be monoblock 4 piston caliper upgrade but no 6 piston.
The closest one from VW would be Touareg which also has 6 piston brake calipers as standard on 3.0 TDI V6 engines and it has again a completely different ABS block.

Edit: The 4 piston monoblocks seem to be for RS3 or TT RS Audis but not for VW :(
 
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Somnus

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^^Downtime

I'm not sure I follow, as the scans I have seen for the 8V0 controller have the same mirror bytes as 3/5Q0.

Borrowed 8V0 ABS code from here
Code:
2F 9C 6B 8D D4 99 13 AD 89 94 0B 6D 41 95 69 F4 D6 2B C8 91 D0 82 96 76 02 41 50 74 82 08 12
Byte 4 - D4 (11010100) | Byte 17 - 2B (00101011) | Byte 19 - 91 (10010001)
 
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   #17  

Somnus

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Interesting...

One thing I noticed is that the part number series that VCDS is reporting is different on the two scans as well (8V0 907 vs 8V0 614)

I guess the 27-Byte 8V0 modules are a whole different beast.
 
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@DRI@N

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My binary code from BYTE 4 is 01010100 and from the BYTE 17 is 00101010 !!!
After my opinion I think is something wrong in the new tryed code !!!!!
 
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You mean the original code? That is correct, byte 4 is 54 hex and byte 17 is inverse bits from byte 4 which makes it 2A.

Those inverse bit bytes work as checksum bytes.
 
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dnoermann

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So, another MK100 ABS Coding challenge :)

We have good Faith that
- Byte 04 is Break Configuration on that MK100 ABS versions
- That this is "cheksummed" some where in a later Byte by inverting the bit order

Looking into some Autoscans of 3Q0 907 379 H it is clear that for this version it is Byte 04 and Byte 17
Here you find two Values:
0x54 with 0x2A and 0x34 with 0x2C

Code:
                  000102030405060708091011121314151617181920212223242526272829
WVWZZZ3CZFE400297 0EEC6B8F54200B6C0779070941CA6970D62AD0E0E08296F5B86250F8CAA9
WVWZZZ3CZGE234991 0EEC6B8F54230B700780070941C46970D62AD0E0E08296F5B86250884AA9
WVWZZZ3CZGE027954 0FEC6B8F54220B730780070541C769F0D62AD0E0E08296F5386250F8CAA9
  xxxxxxxFP407265 0FEC6A8F34200B730779060641C849F0562CD0E0608292F13862F078CAA9
WVWZZZ3CZFP40xxxx 0FEC6A8F34200B730779060641C849F0562CD0E0608292F11862F078CAA9
WVWZZZ3CZFP4xxxxx 0FEC6A8F34200B730779060641C849F0562CD0E0608292F11862F078CAA9
WVWZZZ3CZFP407265 0FEC6A8F34200B730779060641C849F0562CD0E0608292F1B962F078CAA9
WVWZZZ3CZGE175511 40EC6A8F34274B71077C070141C44902562CD2E0E08292F9B8625078EAA9

So first i would Test if the one other known config is any better for you.
If not that you could try the 254 other posible combinations for Byte 04 and 17

Good luck and stay safe.
 
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