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Brake Problems

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by cleszkie, Dec 10, 2001.

  1. cleszkie

    cleszkie 1/2 ton status

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    Over the course of about a week the brakes on my 72 K5 seemed to be getting worse. I have power brakes (disks up front, drums in rear). The peddle has become very dead (hard). I checked all of the pads, bled all of the lines several times over, bench bled the master cylinder, but still have the same problem. Could this be a problem with the booster? When bleeding the brakes, I made sure to hold in the metering pin on the combination valve, but the pin did not seem to give any resistance. I expected it to feel "spring loaded". Could there be a problem with the combination valve? Any advice is appreciated.
     
  2. Triaged

    Triaged 1/2 ton status

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    It most likely is your booster. Air in the lines will make the peddal feel soft not hard.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  3. POFF

    POFF 1/2 ton status

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    Check the vacuum hose to the booster first.

    Never said I could spell!
    '70 K-20 San Diego, CA
     
  4. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    as well as the check valve where the vaccuum line goes into the power booster.
    "suck &amp; blow" and air should only be allowed to go in one way.


    [REAL MEN DON"T CARE ABOUT GAS MILEAGE!]
    Ryan B.
     
  5. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Isn't a "hard" pedal a possible indication of a frozen wheel cylinder or stuck caliper?

    That might explain why bleeding isn't helping.....



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  6. cleszkie

    cleszkie 1/2 ton status

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    Thanks for all the input. All my brake cylinders are in good working order, so I'm focusing my attention on the booster and/or vacuum lines/valves.
     

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