Question about 1998 Audi A6

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99' Audi A6 2.8 Q no brakes, low to no pedal pressure...

I have a 99' Audi A6 2.8 Q and have a major brake issue. When I hold the brake pedal down with steady pressure it will go to the floor and barley stop the car. All the pads and rotors are good and I have changed the master cylinder and blead the whole system with NO change. Would the ABS pump cause this> Please help... Thanks

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  • roundelm3 Jun 19, 2009

    Hello, I ckecked the booster per your instructions and all is good, I did a quick check with the e-brake on and I gained a good inch in pedal height, cant adjust cablel at the moment (it pouring rain out). What are the plates on the front rotors? do they go behind the rotor to bump it out or are they on the pads themselves. This car is new to me and the pads were replaces by the previous owner. Thanks

  • roundelm3 Jun 19, 2009

    Ok I adjusted the cable like you said and drove the car and it seemed a tad better but when I slam the bakes on it will not lock up and the ABS does not kick in either. When I bled the system eirlier in the week I did it in the backwards order than you sugested, would that make any differance? (started driver front wheel) All the fulid ran clean at all points and I used a mighty vac to bleed them. When this all started they just got progressively worse over a few days, are there any sensors dealing with the brakes that could cause this?

  • roundelm3 Jun 19, 2009

    Also can I buy these plates seperately at an auto parts store?



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Not likely the ABS pump there is something wrong with the mechanical brakes it sounds like the emergency brake is not adjusted try adjusting the rear cable first then pull the emergency brake and push your foot on the brake if it is still to the floor you have a problem with a cylinder or a mechanical adjustment, if it's higher with the E brake on then you have the adjusters not set right and the cables not adjusted, So adjust the cables first. If the brakes are spongy with the engine off then it will need to be power bleed if that does not fix it then you may have the wrong brake shoes or pads on the car. Did you install the plates in the wheel rotor front braes? If not you lose 1/4 inch travel on the from pads, if the basic brakes are not right the ABS side is not going to be right so those problems have to be dealt with first. Also DO YOU HAVE A POWER ASSIST BOOSTER IF SO IT COULD BE BAD, TO TEST HAVE SOMEONE STEP ON THE BRAKE PEDAL AND PULL THE HOSE OFF THE BRAKE BOOSTER IT'S behind the master cylinder (sorry for the caps) if you don't here a suction sound when you remove the hose then you have a bad heck valve by the booster connected to the hose that plugs into the booster. if all of this is ok then it may be the ABS booster but normally its a bleeding problem. write a comment if this does not help or you need another lead,

Posted on Jun 19, 2009

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  • Bruce Hathcock Jun 19, 2009

    the plates go on each pad the back side then it has to have anti squeel put on them, this gives you 1/8 inch brake pedal per wheel.which will give you 1/2 inch more brake pedal. the brake e cable must be adjusted until it barley touchesthe rear wheel, when apply the brake the E-brake the pedal should not move more than a couple of inchehes if it does it's out of adjustment. so adjust pull the rear drums off and make sure all parts are in there correct place if they are then bleed the system starting withthe wheel farthest from the master cylinder and bleed til you get a solid stream of fluid comming out without any air bubles, thisshuld fix your problem, also you have to adjust the rear brakes till they barely touch the shores this will give you a snug rear brake assembly and adding the plates to the front pad will give you more after doing these things you should have a full pedal, if so drive the car to 15 miles per hour and slam on the brakes. stop get outside and look at each wheel all the skid maks on the wheels should be the same if one does not lock up yo have a problem with that brake, but this should give you plenty of brake travle on the brake pedal and it should be hard. after doing this let me know what happens and we will go tothe next step.

  • Bruce Hathcock Jun 19, 2009

    the plates are sold sepertaly and you should of had some when you removed the old shores and yes without starting from the farthest first it will leave air in the system, to know for sure the brakeswill fill spongy thats your clue to bleed them as I told you, also do a power bleed, that means with engine running so you have more force on the hydrolic system.

  • Bruce Hathcock Jun 19, 2009

    there are no sensors it has to do with the foudation of the brakes if they are not right the abs won't eaither so you have to figure what is causeing the brakes to fade and I can assure you they need to be bleed, had the problem many many times.



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