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how to reset proportioning valve on 1998 GMC Sonoma

replaced brake lines and have no pressure to rear brakes

Asked by for the 1998 GMC Sonoma
best way is with a scan tools on auto bleed
You are absolutely correct Greg.
2 more answers
best way is with a scan tools on auto bleed
You are absolutely correct Greg.
gravity bleed it first then stomp on brake pedal to see if you get valve to move