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Bleeding Brakes

Discussion in 'Trucks and Trailers' started by bob, Nov 4, 2000.

  1. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,260

    When bleeding brakes, do I do the front or rear first? The truck is a 1997 GMC1500.
     
  2. cjtatar

    cjtatar LawnSite Member
    Messages: 29

    You start from the rear passenger side, then goto the rear driver side, then to the front passenger side, and finally the front driver side. You always bleed the from the farthest point away first, then gradually move your way closest to the master cylinder.

     
  3. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,260

    Thanks Chris.
     
  4. bandit_36

    bandit_36 LawnSite Member
    Messages: 49

    Your 1997 GMC is equipped with a Kelsey-Hayes 4WAL brk. sys.
    The sequence Chris told you is correct but be aware that it may take up to 2qts. of fluid & needs to be ran through a [function test] to purge the air from the ABS unit.This can only be done with the use of a scan tool.(eg.OTC4000,TECH-1,TECH-2 or equivelent)
     
  5. cjtatar

    cjtatar LawnSite Member
    Messages: 29

    Good input. I was not aware of this. Is the same true for all GM Trucks with ABS? My 94 has ABS in the rear, in 2 wh drive only.
     
  6. bandit_36

    bandit_36 LawnSite Member
    Messages: 49

    Technically yes, but through past experience it can be done without a scan tool. By shorting pins A&H on your DLC (DATA LINK CONNECTOR),under the dash you can display flash codes& cycle both solenoids.
     

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