Failing Master Cylinder?
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Thread: Failing Master Cylinder?

  1. #1
    FRESHMAN ROVER
    Join Date
    October 25th, 2010
    Location
    Oklahoma City, OK
    Posts
    28

    Failing Master Cylinder?

    Hi Everyone,

    I have a 91 RRC that I replaced the driver side brake caliper and hoses on about a three months ago. Bled the system with new fluid and everything seemed fine up until today. I drive a lot of highway miles and when I don't use the brakes for long periods the peddle gets soft and moves about half way down before catching and slowing the truck. After that, the pressure builds back up and the brakes feel normal and firm for a while but then it goes soft again. The accumulator and pressure switch were replaced last year. I have not found any leaks at the lines or calipers and the fluid level is where it should be.

    Is my ABS/master cylinder on the way out? The truck has 279,000 miles on it.

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  3. #2
    SOPHOMORE ROVER Mikieman's Avatar
    Join Date
    February 19th, 2016
    Location
    St louis
    Posts
    477
    I would bleed the system again
    Sounds like still air in lines
    im an american i dont speak english

    91 classic..it is now parts

    92 lse... not a bucket of rust

  4. #3
    FRESHMAN ROVER
    Join Date
    October 25th, 2010
    Location
    Oklahoma City, OK
    Posts
    28

    Re: Failing Master Cylinder?

    Thanks. I will bleed them again and hopefully that will take care of it.

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