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#1 |
Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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Just installed new brake lines throughout. New calipers, and rear drum brake parts are all new. Started to bleed brakes, and had no problems with the calipers. Can't get fluid between master cyl. and rear wheel cyl's. Tried to vacumn bleed and tried to back bleed. No luck. could proportioning valve be bad? Reason I ask, is that the front bled so easy and all the problems I'm having with the rear. Any ideas or suggestions would be appreciated. Thanx.
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![]() ![]() ![]() LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! ![]() ![]() |
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,901
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Is fluid getting to the junction at the rear axle? If not, check it at the input to the rear hose. If you have fluid flow there than I think your hose is bad. If you still lack fluid then check the master cylinder. Maybe the reservoir for the rear isn't pumping. If you have no fluid at the rear but master cylinder output seems good then I would say it is your proportioning valve.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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The proportioning valve keeps fluid from going to the rear brakes to keep them from locking up. There is a pin under a rubber boot that needs to be held in while bleeding the brakes....A good sized "zip tie" should hold it in for you
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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#4 |
Senior Member
Join Date: Apr 2000
Location: Oregon
Posts: 2,512
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zip tie!!!!!
Great idea. I heard there was a tool for this but haven't found one or even seena picture of one yet.
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Bob |
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#5 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,901
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Kool I wish I knew of that too. I didn't realize or guess ever need to do that step with the proportioning valve.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#6 |
Registered User
Join Date: Jan 2004
Location: Garland TX Dallas area
Posts: 658
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had the same problem I had to start at where the rubber line connects to the line on the frame and start there. I had someone push down on the pedal and put my thumb over it before they let off kind of messy but it worked.
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#7 |
Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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Everything from Master cyl. to the shoes is new. Think I got a bad hose? I suspected the proportioning valve, because it's the only thing that's not new in the system. Oh, I tried to push in the pin as you said, but couldn't get it to move. Can they be rebuilt or serviced? Will check this weekend. Thanx.
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![]() ![]() ![]() LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! ![]() ![]() Last edited by OhioDan; 10-21-2004 at 05:15 PM. |
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#8 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Did you bench bleed the master cylinder real good before installing it?Maybe the back resevoir,which is actually the front I think,is in need of bleeding again.
And try holding the button on the valve too ![]()
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#9 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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That valve is not likely to move by hand. It is controlled by the internal pressure in the lines. It is there to cut-off the fluid supply to the lines if one should break/leak. (This causes lower pressure on that end) That is the point of the newer dual reservoir systems. The simplest way I have found to free it up is to open the bleeders on the side that does have pressure, in this case the front. Then press the brake pedal, when it reaches the floor you will hear or feel it pop. It may take a few pumps...... Then pump the pedal slowly a few times. Let the truck sit a while with ALL of the bleeders open, making sure to not let the master cylinder get empty. Then tighten all of the bleeders again. Now, start over bleeding......but start at the right rear (furthest from the M/C) and work your way to the front.
You are never going to get a brand-new (dry) system bled by starting from the front.....this will happen every time. |
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