Mechanics

WHY DOESNT MY BRAKES BLEED PROPERLY?

1986 Pontiac 6000 • 135,000 miles

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.
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Bobstuck
September 20, 2012.




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

Saturntech9
Sep 20, 2012.
Yes. I was told to plug the two ports with the proportioning valves then bleed the two top ports.

Tiny
Bobstuck
Sep 20, 2012.
Thats how you bleed the master?

Saturntech9
Sep 20, 2012.
I master was bleed properly could it be a bad master cyl?

Tiny
Bobstuck
Sep 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?

Saturntech9
Sep 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
Bobstuck
Sep 20, 2012.
I would did the new master come with a bleed kit?

Saturntech9
Sep 20, 2012.
Yes

Tiny
Bobstuck
Sep 20, 2012.
Did you use the kit to bench bleed it before hooking the lines up to the car?

Saturntech9
Sep 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?
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Tiny
Bobstuck
Sep 20, 2012.

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