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#1 |
Hammer On!
![]() Join Date: Jul 2001
Location: Olathe, KS
Posts: 473
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Well, my problem has been troubling me for some time. I guess it really took notice when i tore a hole in my rear brake line up towards the exhaust manifold, since then things haven't gotten any better. I've replaced the master cylinder about 2 years ago from the "zone" and this evening replaced the booster. My trouble is an extremely low pedal and when i go to bleed the brakes, nothing comes out for like 10 seconds and then slow starts to bleed. The end result is the guy operating the pedal has to help push it to the floor. Whats up with this???
![]() Aaron ![]()
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1968 C20 Inline 6 250 SM465 4 speed 1968 K10 Inline 6 250 SM465 4 speed |
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#2 |
Hammer On!
![]() Join Date: Jul 2001
Location: Olathe, KS
Posts: 473
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Forgot to mention....shoes are in great shape, all the drums have plenty of meat left on them. Infact the front 2 i just replaced this past week. no wheel cylinders are leaking either.
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1968 C20 Inline 6 250 SM465 4 speed 1968 K10 Inline 6 250 SM465 4 speed |
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#3 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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A pedal going to the floor is usually a sign of a bad master cylinder, or air in the lines.
Are you leaking brake fluid? If there is a hole in the line, it will let air back in when you try to bleed them. I had a tiny hole once when i was bleeding brakes....happened when i didn't crank down a fitting hard enough. I tried for an hour to bleed them with no luck. Once i found the brake fluid leak and fixed the problem they bled correctly in 5 minutes. I would be pretty suspicious of that master cylinder though.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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#4 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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How are the rubber hoses? They can swell up inside and choke off the fluid. It does not happen often, but it does happen.
The fluid should quirt out when you are pressing on the pedal. Good luck! Jim |
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#5 |
Hammer On!
![]() Join Date: Jul 2001
Location: Olathe, KS
Posts: 473
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Jim, the rubber hoses are good. I checked those while bleeding for swelling and nothing there. The fluid does squirt out after you give it some motivation but according to my buddy he had to give it more than usual. I'm kind of wondering on the master cylinder myself. I've been told to take it to a shop and have it pressure bled. So im not sure where exactly to start out. New master cylinder or having it bled? Anyway, ill keep you guys posted
Aaron ![]()
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1968 C20 Inline 6 250 SM465 4 speed 1968 K10 Inline 6 250 SM465 4 speed |
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#6 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,293
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for $20-30 for a new master id tend to swap it out cause im betting its a bad master. dont forget to bench bleed it first
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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If you still have your recept, take he master back to Auto Zone and replace it. (Life time warranty right?)
Your drums may be out of adjustment too...but I kinda lean twards the hydraulic side for this problem. |
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#8 |
Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
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Does the same reaction occur on all four wheel cylinders when you try to bleed them?
I'd flush the entire brake line system with new fluid as well.......
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1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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#9 |
Hammer On!
![]() Join Date: Jul 2001
Location: Olathe, KS
Posts: 473
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So heres the update on my current brake problem. I replaced the master cylinder and tried to bleed again. I get nothing for pressure
![]() Aaron ![]()
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1968 C20 Inline 6 250 SM465 4 speed 1968 K10 Inline 6 250 SM465 4 speed |
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