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  1. #1
    Active Member Two Rings fsteve's Avatar
    Join Date
    Mar 22 2018
    AZ Member #

    B6 S4 Brake Conversion issues.

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    Hello all. About 3 months ago I converted to the B6 S4 front and rear brakes. During this process the car was down with open lines for about a week, the brakes in question came off a running driving car that belonged to my co-worker. When I finished putting the car back together I could not get the brakes to bleed correctly. Purchased an aftermarket master cylinder, bench bled it, installed it, same issue present. Purchased an OEM master cylinder, installed it, same issue present. Purchased and installed a used brake booster as well to no avail. The issue with the brakes is that the car will not gain pedal pressure, despite there being no air in the lines. We have an air pressure bleeder at my work (Audi dealer) and we have gotten the ABS pump to run and bleed as well. The car has now been sitting for the last two months due to no technician being available to look at the car. A few noteworthy things is that I replaced the front brake hoses, all the masters were bench bled, the only main difference is that the booster we put in was not the same style that came out. There is the TRW brakes and the ATE brakes, the car originally was equipped with the TRW and the booster in it now is an ATE setup. At this point my patience has worn thin and I'm pretty much out of options. Before anyone asks, the calipers are installed on the appropriate sides and fluid is coming out of all calipers. Don't tell me to do a search I came up with nothing, if anyone has any kind of insight or personal experience with this please chime in. I need this car back on the road as soon as possible. Thank you
    2004 Audi A4 1.8TQM, Audi Exclusive Imola Yellow 1 of 3
    268k and counting...

  2. #2
    Active Member One Ring
    Join Date
    May 03 2017
    AZ Member #

    Are the brake pads and rotors new..? Also, are the emergency brake cables connected and the emergency brake functional...?

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  3. #3
    Senior Member Four Rings Kevin C's Avatar
    Join Date
    Mar 28 2015
    AZ Member #
    My Garage
    1987 Dodge Raider G54B Turbo
    Portland OR, United States

    With a bleeder open do you get fluid out when you push the brake pedal? When you were power bleeding did you try using a manual bleed procedure of pushing the pedal and cracking each bleeder screw? Basicly do a manual bleed with an assist from a power bleeder.
    03 A4 Quattro, 1.8T, 02X six speed conversion/ GJW (4.11 final drive). RS4 RSB, H&R FSB.

  4. #4
    Senior Member Three Rings V70R's Avatar
    Join Date
    Feb 14 2015
    AZ Member #
    PDX, OR

    How much fluid did you lose during the week with the lines open? I think you have a ton of air in the system and need to get the car up in the air, and pressure bleed the system via a Motive power bleeder. Get at least 2 liters of fluid, a mason jar, about 3’ of clear hose and go to work.

    Oh, and before you get started- get the car up in the air, have someone press on the brakes with light pressure and try to rotate each wheel...this will help isolate where the problem is. DC that all of your lines are tight, too- it doesn’t take much for a line to be loose and not completely seal on the flare fitting. HTH
    Xlite w/ 11spd Campy Record- 2005 Dolphin Grey Ultrasport Avant 6MT-- 2001.5 Light Silver Metallic Avant 5MT w/ Sludge Package --1979 Scout II


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