1991 Deville brake problem - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1991 Deville brake problem in Past Cadillac Vehicle Discussion; Could be MC......
  1. #16
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
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    Could be MC...

  2. #17
    MY FYN 79 is offline Cadillac Owners Member
    Automobile(s): 1991 Deville
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    Re: 1991 Deville brake problem

    I can take a picture later today if need be, but its not the master cylinder. These are a couple feet in front of the rear wheel along the "framerail". I don't believe it to have anything to do with proportioning because its so far downstream already and the left/right rear lines are separate. They run along and each separate rear line runs through one of these things that look like filters. There are no electronics going to them either.

  3. #18
    MY FYN 79 is offline Cadillac Owners Member
    Automobile(s): 1991 Deville
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    Re: 1991 Deville brake problem

    Called a GM dealership and they actually are proportioning valves. Just for reference in the future I'll snap a picture of them and post it here.

    Now to determine if I have fluid in front of it or not. That should tell me if its a faulty master cylinder or the proportioning valve. Still seems odd that one side has good strong fluid and the other side has nothing.

  4. #19
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1991 Deville brake problem

    Quote Originally Posted by MY FYN 79 View Post
    Still seems odd that one side has good strong fluid and the other side has nothing.
    That sounds like a proportioning valve.

  5. #20
    MY FYN 79 is offline Cadillac Owners Member
    Automobile(s): 1991 Deville
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    Re: 1991 Deville brake problem

    Wanted to update this because those open ended topics bug me.

    Took apart the proportioning valve on the side in question and cleaned a bunch of crud out of it. Buttoned it back up, bled the brakes good and all is well again. Guessing the buildup is from sitting so many years. Thanks for the help and suggestions.

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