WHY DOESNT MY BRAKES BLEED PROPERLY?

  • Tiny
  • bobstuck
  • 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.

Thursday, September 20th, 2012 AT 12:23 AM

13 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,244 posts

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

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Thursday, September 20th, 2012 AT 12:30 AM
  • Tiny
  • bobstuck
  • Member

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

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Thursday, September 20th, 2012 AT 12:37 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,244 posts

Thats how you bleed the master?

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Thursday, September 20th, 2012 AT 1:00 AM
  • Tiny
  • bobstuck
  • Member

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

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Thursday, September 20th, 2012 AT 1:16 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,244 posts

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

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Thursday, September 20th, 2012 AT 1:35 AM
  • Tiny
  • bobstuck
  • Member

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?

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Thursday, September 20th, 2012 AT 5:09 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,244 posts

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

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Thursday, September 20th, 2012 AT 5:26 PM
  • Tiny
  • bobstuck
  • Member

Yes

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Thursday, September 20th, 2012 AT 5:35 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,244 posts

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

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Thursday, September 20th, 2012 AT 7:34 PM
  • Tiny
  • bobstuck
  • Member

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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Thursday, September 20th, 2012 AT 8:55 PM

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