Too much "WHOA" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mobileortho · 07-01-2010, 10:01 PM

Ok , I need a little help here. I have disc's on all four corners & a firewall mounted booster/proportioning valve. Problem is the front brakes are sticking. Bled the brakes last week and have good pedal pressure but the front brakes don't seem to be disengaging. Any ideas?

chevy49 · 07-01-2010, 10:24 PM

are your flex lines new? i have had them go bad and do that to me.

blackdiesel · 07-01-2010, 10:32 PM

Be sure that your push rod is not to long, if it's pushing on the piston in the master cyl. any at all it will block the blead back hole and not let the caliper release.

pgf545 · 07-01-2010, 10:32 PM

What master cylinder are you using? I have seen a drum brake master cylinder have valves in them preventing fluid from running back into the reservoir. Also can you tell if it is the front or back that is causing the problem? That might help isolate the problem.

Bernie

OrrieG · 07-02-2010, 12:08 PM

You might also need to reset (center) your proportioning valve. When I got my truck running the first time I had the same problem and it turned out to be a sticky used pv.

mobileortho · 07-03-2010, 03:38 PM

I don't think it's the M/C. It did the same thing last year when I had it running briefly. All components were new, including the hoses and calipers. It has sat up however for a number of years as I piddled with it. As I mentioned before I just swapped out the M/C recently. It's the same style but it came with a proportioning valve. I think the calipers have gone bad from sitting so long. Just bought a set to install but got side tracked by my dog. He got out of the yard yesterday morning and was missing all day. He came back home that evening and was is awful shape. Looks like he was attacked by a pit or two. There are huge chunks missing from all four legs with his back legs being the worst. His face is all torn up as well. Gotta play doc for awhile.

mobileortho · 07-10-2010, 07:49 PM

Problem solved!! Got a chance to install the calipers and that took care of the problem. Now on to the engine. Gotta figure out why it's running so crappy!

07-01-2010, 10:01 PM	#1
mobileortho Registered User Join Date: Sep 2008 Location: Hampton, VA Posts: 904	Too much "WHOA" Ok , I need a little help here. I have disc's on all four corners & a firewall mounted booster/proportioning valve. Problem is the front brakes are sticking. Bled the brakes last week and have good pedal pressure but the front brakes don't seem to be disengaging. Any ideas? __________________ Robert C. 1950 3600 3600 re-do, shortening it up If it's true what they say, "You learn from your mistakes," I'm a Genius in the making.

07-01-2010, 10:24 PM	#2
chevy49 Registered User Join Date: Nov 2008 Location: coal city indiana Posts: 159	Re: Too much "WHOA" are your flex lines new? i have had them go bad and do that to me.

07-01-2010, 10:32 PM	#3
blackdiesel Registered User Join Date: Jan 2009 Location: Omaha, Arkansas Posts: 929	Re: Too much "WHOA" Be sure that your push rod is not to long, if it's pushing on the piston in the master cyl. any at all it will block the blead back hole and not let the caliper release. __________________ '57 Chevy Pickup '56 GMC LCF Cummins '38 Chrysler Royal '57 2wd change http://67-72chevytrucks.com/vboard/s...light=speedway

07-01-2010, 10:32 PM	#4
pgf545 Registered User Join Date: May 2006 Location: Santa Fe,Texas Posts: 933	Re: Too much "WHOA" What master cylinder are you using? I have seen a drum brake master cylinder have valves in them preventing fluid from running back into the reservoir. Also can you tell if it is the front or back that is causing the problem? That might help isolate the problem. Bernie __________________ 52 Chevy Truck (Dad's) http://67-72chevytrucks.com/vboard/s...d.php?t=206021

07-02-2010, 12:08 PM	#5
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: Too much "WHOA" You might also need to reset (center) your proportioning valve. When I got my truck running the first time I had the same problem and it turned out to be a sticky used pv. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

07-03-2010, 03:38 PM	#6
mobileortho Registered User Join Date: Sep 2008 Location: Hampton, VA Posts: 904	Re: Too much "WHOA" I don't think it's the M/C. It did the same thing last year when I had it running briefly. All components were new, including the hoses and calipers. It has sat up however for a number of years as I piddled with it. As I mentioned before I just swapped out the M/C recently. It's the same style but it came with a proportioning valve. I think the calipers have gone bad from sitting so long. Just bought a set to install but got side tracked by my dog. He got out of the yard yesterday morning and was missing all day. He came back home that evening and was is awful shape. Looks like he was attacked by a pit or two. There are huge chunks missing from all four legs with his back legs being the worst. His face is all torn up as well. Gotta play doc for awhile. __________________ Robert C. 1950 3600 3600 re-do, shortening it up If it's true what they say, "You learn from your mistakes," I'm a Genius in the making.

07-10-2010, 07:49 PM	#7
mobileortho Registered User Join Date: Sep 2008 Location: Hampton, VA Posts: 904	Re: Too much "WHOA" Problem solved!! Got a chance to install the calipers and that took care of the problem. Now on to the engine. Gotta figure out why it's running so crappy! __________________ Robert C. 1950 3600 3600 re-do, shortening it up If it's true what they say, "You learn from your mistakes," I'm a Genius in the making.



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