Question about Dodge Ram 3500

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Problem with brakes

When you step on the brakes and hold them, they slowly go to the floor. The truck has brakes. We have changed the master cylander and the problem is still the same. The master cylander does not lose any brake fluid. We have checked everything, and there are no leaks anywhere. What could be the problem???

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  • hopezponna Apr 22, 2009

    Same problem. purchased new master cylinder from Autozone...

  • dvcontractor Apr 22, 2009

    We changed the master cylander, which we got at autozone and it is doing the same thing. Someone said it could be the pressure reducing valve??? Is that a possibility???

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  • Dodge Master
  • 6,982 Answers

It sounds very much like you just installed another bypassing master cylinder. No leaks and you got all the air out, bled the new master & all wheels...Go back there I'll bet it'a no good.

Posted on Apr 21, 2009

  • Richard Scordino Apr 22, 2009

    My nephew put pads on the front of a grand am about a month ago and ran into the same problem. Contrary to everything I know to be true,(after thousands of brake jobs) the rotors turned out to be too worn (calipers should adjust for that) and when changed, everything returned to normal.(even though aside from some pad wear, everything was OK before he started job) The odds of having two bad masters in a row is not something I'd bet on...leaving air in the system as a suspect. Any valving may affect application pressure, but not cause the pedal to sink.A bad booster would give you a rock hard pedal with no assist, but should not permit pedal to sink. If you pump the pedal a few times do the brakes come up but then sink down? Are you certain that there is no air anywhere in the system? When you bleed at the wheels are you getting good flow of clean fluid?

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  • Master
  • 490 Answers

The brake booster has a rubber diaphragm in it that sometimes goes out and causes that problem

Posted on Apr 21, 2009

  • Jeff Adkisson
    Jeff Adkisson Apr 22, 2009

    autozone is famous for selling bad parts also it very possibly can be the master cylinder you got is bad

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Hi,

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