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Audi A3 diesel 2000 reg brake pedal going to the floor with engine running and heavy pedal pressure

New master cylinder, discs pads and front flexi hoses. With blanking plugs fitted to outlet ports on abs valve pedal solid. Repeated attempts to bleed system have not resolved the problem. The brakes function correctly and feel OK on the road. It is when stationary with the engine running the pedalwhen pressed heavily will swink slowly to the floor. Has failed MOT because of this. Any help would be appreciated.

Mike

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  • mikecar Jul 07, 2008

    have already tried this. with blanking nipples fittted to the abs valve the pedal is ok

  • Anonymous Mar 23, 2014

    when trying to bleed each caliper all went well untill i got to the last caliper(l/f) the pedal went to the floor and started letting air in the system. not getting much fluid out of the caliper just very little air. went back to the master cyl and verified that it was pushing out fluid instead of air and all was good, after further looking there are 2 lines that come out of a rect..block with a banjo bolt holding it on to the mod.valve for the abs. one of those is dripping fluid. what is it and can you buy just that part?

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You should have bench bleed the master cylinder first before installation return cylinder and get a new one than bench bleed it first than install it to car once installed you may have to bleed each wheel

Posted on Jul 07, 2008

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Brake light and abs light on. I start engine, step on peddle,it goes to floor, then light go out and brakes ok


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A similar symptom can be experienced when a wheel bearing has excess free play and pushes the pads away from the disc.

I would use a hose clamp and isolate each brake in turn until the brake pedal operation is normal. If no clamping operation makes a significant difference I would then clamp two, three and then four hoses when if there is still no difference I would suspect the master cylinder or the basic brake pedal and servo adjustments.

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