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07-10-2014, 01:24 PM
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#1 |
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Registered User
 Join Date: Sep 2005
Location: Oklahoma USA
Posts: 1,000
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Brake Bleeding
Read thru a bunch of posts this AM....did not find mention of my problem.
72 LWB, 402, power brakes. Truck sat for about 10 years. 1. We both know how to properly bleed brakes using the 2 man method. 2. Put on new master cylinder and started 2 man brake bleeding process at pass side rear wheel. 3. Could only get a small dribble of brake fluid to come out no matter how many times I pumped the brakes. 4. Moved to driver side rear, not much better results. 5. Despite pumping the brake at least 100 times, never got any pressure, nor more than a dribble from the rear wheel cylinders. Brake lines/hoses appeared intact as we did not see any seepage. |
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07-10-2014, 01:35 PM
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#2 |
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Registered User
Join Date: Mar 2012
Location: New Orleans, La
Posts: 406
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Re: Brake Bleeding
My rear brake lines were corroded on the inside. Try breaking the line at the tee in the rear and see if you get good flow from there.
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It's not that I am apathetic, I just don't care. If your life is a joke, it appears death will be your punchline. |
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07-10-2014, 01:42 PM
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#3 |
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Registered User
Join Date: Sep 2005
Location: Oklahoma USA
Posts: 1,000
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Re: Brake Bleeding
That's my next COA, although probably should just go buy a set of new lines....42 year old truck....and save a lot of time.
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07-10-2014, 01:44 PM
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#4 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,928
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Re: Brake Bleeding
Did you "bench bleed" the master cylinder before you installed it?
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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07-10-2014, 01:53 PM
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#5 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,141
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Re: Brake Bleeding
Did you set the proportioning valve in the correct position for bleeding?
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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07-10-2014, 02:02 PM
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#6 |
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Registered User
Join Date: Sep 2005
Location: Oklahoma USA
Posts: 1,000
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Re: Brake Bleeding
Yes, bench bled MC.
Did not remove rubber cover and hold in the little green nipple on the prop valve.
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1968 Custom SWB, 327/3 speed OTC 1969 CST LWB, 402/400 1970 CST LWB, 402/400 1970 Sierra Grande LWB, 350/350 1971 Cheyenne LWB, 350/350 1972 Cheyenne Super LWB, 402/400 1972 Sierra Grande LWB, 402/400 1979 Silverado LWB, 350/350 1984 Suburban 1990 454 SS 1991 Silverado, X-cab, 4.3/5 speed Getrag 2005 Silverado Crew Cab Corvettes: 75, 77, 78, 93, 96 |
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07-10-2014, 03:59 PM
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#7 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,230
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Re: Brake Bleeding
My rubber hose in the rear was bad in my causing mine to do that
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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07-10-2014, 05:29 PM
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#8 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brake Bleeding
you know how to bleed braks do you?? read up the factory service manual tells you how to do it properly by clamping the pin in the combo valve
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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07-10-2014, 07:26 PM
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#9 | |
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Registered User
Join Date: Nov 2011
Location: Kirkland, WA
Posts: 343
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Re: Brake Bleeding
Quote:
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07-10-2014, 09:30 PM
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#10 |
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Registered User
Join Date: Jun 2011
Location: Osceola, Ia
Posts: 2,016
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Re: Brake Bleeding
[QUOTE=73737373;6755612]Read thru a bunch of posts this AM....did not find mention of my problem.
72 LWB, 402, power brakes. Truck sat for about 10 years. Could be the prop valve, but sitting 10 yrs I bet it's a blockage. Take it loose above the rear hose if it will, bet it fires out of there.. Keep us updated. Good luck 
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Shawn 68 chevy K/20 05 chevy 3/4 4x4 71 short step-sold  71 chevy Beauville van My build. http://67-72chevytrucks.com/vboard/s...d.php?t=633039 |
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07-11-2014, 09:34 AM
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#11 |
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Special Order
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Brake Bleeding
I had the same problem on a Jimmy I swapped the axles from a 3/4t Suburban to. The Suburban was mine and I knew the brakes were good when parked. I had replaced the flex lines with new braided stainless,so I knew hoses were good. I could never get much if any pressure in the back. After a new master cylinder I finally decided it must be the rear wheel cylinders. After all,the Suburban had been sitting 5 years. Yep,that was it! These hydraulic parts go bad with sitting and I was still stuck on "I know those brakes were good on the Suburban"
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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