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1986 Pontiac 6000 Repair Question


Topics covered: Proportioning valve, Valves, Brakes.
Mileage: 135,000 miles.

Asked on September 20, 2012

Why doesnt my brakes bleed properly?

I have a 1986 pontiac 6000. The master cylinder has four ports (2 with proportioning valves). I changed the m/cyl and tryed to bleed the brakes. Only one front and one rear would bleed. the other 2 would not let the pedal depress down thus reducing stoping. The pedal is hard to depress and the vacuum booster is good. help.
Avatar Asked by bobstuck

Answer

Replied on September 20, 2012

Did you bleed the master before hooking all the lines up?

Tiny Answered by saturntech9 (expert)
23,174 answers provided
Replied on September 20, 2012

Yes. I was told to plug the two ports with the proportioning valves then bleed the two top ports.

Tiny Response from bobstuck
1 question asked
Replied on September 20, 2012

Thats how you bleed the master?

Tiny Answered by saturntech9 (expert)
23,174 answers provided

Replied on September 20, 2012

I master was bleed properly could it be a bad master cyl?

Tiny Response from bobstuck
1 question asked
Replied on September 20, 2012

Did you bleed the master back into itself with hoses till there wasnt anymore air left?Also why did you replace the master?

Tiny Answered by saturntech9 (expert)
23,174 answers provided
Replied on September 20, 2012

Yes. I replaced it because the pedel was slowly going to floor. Then out I had a leaky front hose. Should I rebleed the master?

Tiny Response from bobstuck
1 question asked

Replied on September 20, 2012

I would did the new master come with a bleed kit?

Tiny Answered by saturntech9 (expert)
23,174 answers provided
Replied on September 20, 2012

yes

Tiny Response from bobstuck
1 question asked
Replied on September 20, 2012

Did you use the kit to bench bleed it before hooking the lines up to the car?

Tiny Answered by saturntech9 (expert)
23,174 answers provided
Replied on September 20, 2012

Lets start over. I bleed the master cyl using the kit provided. The instructings said to plug the lower ports with the proportioning valves and use the hoses o;n the upper ports. In which after doing I located a leaking front hose. Shoud I have rebleed the master cylinder?

Tiny Response from bobstuck
1 question asked