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03-01-2020, 05:02 PM
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#1 |
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Senior Member
 
Join Date: Mar 2006
Location: Clarkrange Tennessee
Posts: 1,787
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bleeding brakes help!
I have a 1970 C10 with drum brakes and I had no brake pedal. I replaced the master cylinder and bench bled it. Now I can't get any brake fluid out of any of the wheel cylinders when trying to bleed the brakes. any help?
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03-01-2020, 06:50 PM
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#2 | |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,761
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Re: bleeding brakes help!
Quote:
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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03-01-2020, 07:40 PM
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#3 |
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Registered User
Join Date: Jun 2015
Location: @
Posts: 890
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Re: bleeding brakes help!
check the rubber flex hoses haven't collapsed inside seems weird they would all go bad at the same time though . more likely air bound somewhere
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03-01-2020, 07:40 PM
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#4 |
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Senior Member
Join Date: Nov 2018
Location: Waterford California
Posts: 2,626
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Re: bleeding brakes help!
I'm not there but pump slowly to give the master cylinder time to fully return.
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03-02-2020, 12:35 PM
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#5 |
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Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,142
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Re: bleeding brakes help!
Been there.....mighty vac, even the generic HF version.
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03-02-2020, 03:17 PM
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#6 |
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Registered User
Join Date: Jun 2002
Location: Tucson AZ by way of WI & CA
Posts: 510
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Re: bleeding brakes help!
Did you just replace the master cylinder? How are you going about bleeding the brakes (pump and hold)? Did you remove the bleeders and make sure they are not clogged? Did you open the bleeders and have a cold one and just let the fluid run? Little more information may help to identify the issue?
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03-02-2020, 08:41 PM
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#7 |
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Senior Member
Join Date: Dec 1999
Location: TX
Posts: 1,623
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Re: bleeding brakes help!
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03-04-2020, 12:08 PM
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#8 |
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Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: bleeding brakes help!
I had a similar issue. Loosened one of the bleeder screws just a bit and then did a bunch of pumping on the pedal to build up pressure. Finally started squirting some fluid out and then bled the system. This was a complete new system though - lines, wheel cylinders, calipers, booster, and master cylinder.
Before I just started stomping on the pedal, I was getting nothing out of any of the bleeders screws. Initially, the pumping was frustration, but seemed to work out in the end. |
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03-04-2020, 12:19 PM
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#9 |
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Registered User
Join Date: Nov 2018
Location: South San Francisco CA,
Posts: 441
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Re: bleeding brakes help!
My son's 69 the front brake lines from the master cylinder to the caliper were blocked and bad.
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03-04-2020, 01:34 PM
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#10 |
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Registered User
Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,391
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Re: bleeding brakes help!
Can anyone explain how to reset brake warning light
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71 C-20 07 Magnum RT AWD |
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03-05-2020, 09:32 AM
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#11 | |
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Senior Member
 Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,721
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Re: bleeding brakes help!
Quote:
Paul Jr @ GMCPauls |
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03-05-2020, 09:56 AM
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#12 |
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Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: bleeding brakes help!
Might try working your way through one piece at a time. Pull the line at the front T and make sure you get fluid there. Pull the line before the flex hose and make sure you get fluid there. Make sure the bleeders are nice and clean.
Wondering if there might be something with the rod length on the booster. Any you noticing the fluid level dropping in the master?
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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