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Master cylinder reservoir bubbling after bleeding ?

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Old May 11, 2009 | 05:52 PM
  #1  
SolarGoldRaptor's Avatar
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From: France
Car: 1984 Pontiac Firebird Trans Am
Engine: V8 5.0L HO (L69)
Transmission: B&W T5
Axle/Gears: 3.73 limited slip
Master cylinder reservoir bubbling after bleeding ?

Hi guys,

I've just finished replacing the leaky rear caliper on my 84 T/A HO. I've bled the rear brakes only to remove the air, not the fluid. They're working fine, they hold the rear wheels firmly, same for the e-brake (though I need to adjust the cable).

But now when I push the pedal, it's spongy half way and then it's strong as it should. Also, I can see bubbles in the M.C rear reservoir.

I was told I shouldn't have pushed the pedal all the way down when bleeding the brakes. Does that mean the M.C is toast ?

Thanks, Bye
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Old May 13, 2009 | 10:38 AM
  #2  
50bmgshooter's Avatar
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Re: Master cylinder reservoir bubbling after bleeding ?

sounds like air in the master
did you let the reservoir empty? if so bleed the master then bleed the lines back out
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Old May 13, 2009 | 10:45 AM
  #3  
Stephen's Avatar
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Master cylinder reservoir bubbling after bleeding ?

Sounds like whoever was pumping the brakes, might have lifted their foot a bit, before the bleeder was closed, & sucked air in.

Or worn threads somewhere/the bleeders themselves are bad, allowing air to get sucked in.
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Old May 14, 2009 | 11:48 AM
  #4  
SolarGoldRaptor's Avatar
Thread Starter
Senior Member
 
Joined: Sep 2008
Posts: 588
Likes: 2
From: France
Car: 1984 Pontiac Firebird Trans Am
Engine: V8 5.0L HO (L69)
Transmission: B&W T5
Axle/Gears: 3.73 limited slip
Re: Master cylinder reservoir bubbling after bleeding ?

Originally Posted by 50bmgshooter
sounds like air in the master
did you let the reservoir empty? if so bleed the master then bleed the lines back out
No, as I said, I bled only to remove the air in the system. I haven't replaced all the fluid.
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Old May 17, 2009 | 10:36 PM
  #5  
SDIF's Avatar
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Joined: Oct 2003
Posts: 544
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From: Aiken, SC
Car: 91 Z/28, 89 RS Race Car
Engine: 305 stock / ZZ4 AFR 195 9.7:1
Transmission: T5 / t10 / Jerico
Axle/Gears: 10blt w 3.42, 9 in w /3.80 DL
Re: Master cylinder reservoir bubbling after bleeding ?

There is air in the line.

Bleed it again.
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Old May 17, 2009 | 11:38 PM
  #6  
LB9Iroc87's Avatar
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Joined: Dec 2005
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From: Owensboro, Ky
Car: 1987 Iroc-Z28
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: G92 3.23, G80, J65 disc
Re: Master cylinder reservoir bubbling after bleeding ?

when u bleed your brakes you suppose to make sure u got plenty of fluid in the front and rear resevoir and then keep doin the procedure until u get nuthin but fluid a couple of times.
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