Bleeding Brakes

bob

LawnSite Platinum Member
Location
DE
When bleeding brakes, do I do the front or rear first? The truck is a 1997 GMC1500.
 

cjtatar

LawnSite Member
Location
Endicott, NY
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.

 
OP
bob

bob

LawnSite Platinum Member
Location
DE
Thanks Chris.
 

bandit_36

LawnSite Member
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)
 

cjtatar

LawnSite Member
Location
Endicott, NY
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.
 

bandit_36

LawnSite Member
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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