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

  1. #11
    Verified VCDS User @DRI@N's Avatar
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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 !!

  2. #12
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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.

  3. #13
    Verified VCDS User @DRI@N's Avatar
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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 !!
    Last edited by @DRI@N; 03-11-2020 at 01:36 PM.

  4. #14
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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
    Last edited by downtime; 03-11-2020 at 02:22 PM.

  5. #15
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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)
    Last edited by Somnus; 03-12-2020 at 12:53 PM.
    If you are curious about the MK100 ABS controller's Bits and Bytes >>MK100 ABS Coding (Google Drive)<< NOT 100% ACCURATE, INFORMATION ONLY

  6. #16
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    Hmm, on this one it ain't :

    Code:
    99 9C F0 8D BA 9A 15 A9 40 91 09 6B 43 9A B2 06 44 99 0F 5D A8 02 90 C2 4D 60 22
    Byte 4 - BA (1011 1010) | Byte 17 - 99 (1001 1001‬) | Byte 19 - 5D (0101 1101)
    Code of ABS from here : https://forums.ross-tech.com/showthr...l=1#post134139

  7. #17
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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.
    If you are curious about the MK100 ABS controller's Bits and Bytes >>MK100 ABS Coding (Google Drive)<< NOT 100% ACCURATE, INFORMATION ONLY

  8. #18
    Verified VCDS User @DRI@N's Avatar
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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 !!!!!

  9. #19
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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.

  10. #20
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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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