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Thread: 1990 Sedan Deville

  1. #1
    Join Date
    Nov 2003
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    Question 1990 Sedan Deville

    The other day I was driving my Cadillac, when I discovered, the brake pedal felt like I was trying to push down on a rock... I have to apply 50 times the normal amount of pressure in order to stop my vehicle. I am assuming it has something to do with the power brake booster. Could someone give me some ideas on how to diagnose this problem and/or any quick and easy sloutions? Thanks


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  3. #2
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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    Re: 1990 Sedan Deville

    Check to make sure that it is still getting vacuum. While the car is running, pull off the connector plugged into the brake booster on the firewall. make sure that there is strong vacuum at the check valve at the end of the hose.

  4. #3
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    Re: 1990 Sedan Deville

    It does not seem to have a vaccuum assist type system... is that possible?

  5. #4
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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    Re: 1990 Sedan Deville

    It's possible, but those systems are kind of rare. I'm not exactly sure if your car has one though. Do you see the large round booster behind the master cylinder?

  6. #5
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    Re: 1990 Sedan Deville

    That's what threw me for a loop... there is no big round booster attaching to the firewall like I have seen in so many other cars. I wish mine was a 68 it would be fixed all ready.

  7. #6
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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    Re: 1990 Sedan Deville

    Hmm. given that i do not know specifically what your car has, I DO know that GM used 2 other braking systems, electric and Hydra-boost. Out of those two, you likely would have the Hydra-boost, which uses hydraluic pressure from the power steering pump to provide braking assist. Look for hydraluic lines that are noticably larger than brake lines running by the master cylinder. This system is generally used on vans and other vehicles where space is a concern. The other is electric. This system was used on vehicles that do not have vacuum of any sort, namely turbo Buicks. There may be a third possibility, and that is the Bosch system. I do not know a thing about this setup, except it has very weird service procedures and is extremely picky about them. Maybe someone else can chime in?

  8. #7
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    Re: 1990 Sedan Deville

    I have the same problem. your brake light and ABS light are on iam assuming. its either the master cylinder or the ABS pump motor.

    see.. http://www.cadillacforums.com/forums...c/20848-1.html

    and.. http://www.cadillacforums.com/forums...c/36031-1.html

    I took my car to Midas and they want $2158.97 to replace the master cylinder they diagnosed OHH did i laugh at them. I will replace the master cylinder and see.


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