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Old 08-04-2017, 09:26 AM   #1
$20071k10
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Join Date: Feb 2015
Location: Mancos,CO
Posts: 101
squishy brake pedal

I have a 98gmc z71 that I swapped a 6 lug 14 bolt 9.5 in to about 4 years ago. every thing was working good until about 6 months a go. the brakes fell squishy so I pump the pedal gets firm but rear brakes lock up. I have changed calipers, wheel cylinders & master cylinder have bled the system with power bleeder so many times only new fluid comes out any more. could my problem be the proportioning valve? I have no abs light on either.
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