Need some good brake advise

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Suspension, Brakes and Tires Discussion, Need some good brake advise in Item Specific Cadillac Discussion; I have a 68 deville that I did a front disk brake conversion from a 69 caddy. I purchased a ...
  1. #1
    dbird35 is offline Cadillac Owners Member
    Automobile(s): 1968
    Join Date
    Jul 2009

    Need some good brake advise

    I have a 68 deville that I did a front disk brake conversion from a 69 caddy. I purchased a refurbished master cylinder and installed the system. Initially the passenger side soft line was clogged and I blew it out and then bled the brakes....At first the brakes felt pretty good then it started going down to the floor and feeling hard to stop and the brake light is coming on....If anybody has any input it would be gratefully appreciated....

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Need some good brake advise

    Only 3 things: There's air in the system somewhere (bleed everything, starting at the wheel cylinder furthest from the master cylinder - RR ?), the rebuilt master cylinder is faulty, or you have a leaking wheel cylinder/caliper puck seal.

  4. #3
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: Need some good brake advise

    On that old of a car, I would NEVER trust the rubber hoses. Blowing one out is not a repair. Pull the rear wheels and drums and lift up on each rubber boot on the wheel cylinders. If moisture (brake fluid) is present, you need to replace both rear wheel cylinders. That would account for the soft pedal also. If it were mine, I would replace all 3 rubber hoses. 2 front to each caliper and one at the rear axle. The red light comes on when a braking imbalance is sensed front to rear. Most times once the entire system is bled, the light will go out. If it remains on, then the proportioning valve below the master needs a line cracked open then quickly tightened while depressing the pedal to center the check ball within it.

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