01-28-2014, 07:33 PM | #1 |
Project Heaven in my 67!!!
Join Date: Jan 2009
Location: Bosqueville, TX
Posts: 899
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Prop Valve Question
I think my prop valve is a no go. Every time I get into the 87 it seems that initially I am dragging the right rear tire when I step on the brakes. When I bled the brakes it was almost impossible to get brake fluid to the rear brakes. I think the prop valve has given up. Problem is I cant seem to find a replacement at the parts store. Anyone have a part number for a prop valve?
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01-28-2014, 07:41 PM | #2 |
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Join Date: Aug 2009
Location: Bowser
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Re: Prop Valve Question
You might have a leaky wheel cylinder or fluid on your shoes.
Did you hold the reset pin in in the end of the prop valve when you bled the brakes? |
01-28-2014, 07:44 PM | #3 | |
Project Heaven in my 67!!!
Join Date: Jan 2009
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Re: Prop Valve Question
Quote:
Yeah we held it, but it didn't feel like it was moving at all. (Part of the reason I think it is seized)... |
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01-28-2014, 08:21 PM | #4 |
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Join Date: May 2009
Location: Motor City
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Re: Prop Valve Question
For what series or brake option?
Brake system release charts for an '87 pickup/utility attached below: Prop valve is labeled as "comb valve asm" (aka "combination valve"). K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
01-28-2014, 08:33 PM | #5 |
Project Heaven in my 67!!!
Join Date: Jan 2009
Location: Bosqueville, TX
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Re: Prop Valve Question
It is a 2WD 1/2ton SWB with the 350 TBI/700 R4...
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01-28-2014, 09:17 PM | #6 |
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Join Date: Apr 2013
Location: Pasadena, Maryland
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Re: Prop Valve Question
My 86 k2500 would do that even after rebuilding the rear brakes. Found it was the Ebrake cables were rusted. Replaced cables and never he'd the issue again.
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01-29-2014, 02:12 AM | #7 |
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Location: WV
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Re: Prop Valve Question
What about the adjusters? Might have one stuck or one adjusted tighter than the other.
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01-29-2014, 08:42 AM | #8 |
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Re: Prop Valve Question
I'd go with the 18008085, for the JB5 brake system with a 6100 lb GVW.
K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
01-29-2014, 09:48 AM | #9 | |
Project Heaven in my 67!!!
Join Date: Jan 2009
Location: Bosqueville, TX
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Re: Prop Valve Question
Quote:
Again man you have helped me out tremendously! Thanks Brother! Going to order it today and when I return from this business trip I am going to get the truck closer to the ground and brakes working properly! |
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01-29-2014, 10:37 AM | #10 | |
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Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Prop Valve Question
Quote:
-dragging brakes -hard to get fluid out when bleeding I'm just saying, the hose is rubber and likely old and they absolutely do swell shut inside. I've changed the brake hoses on two 73-87 trucks this year already for the same reasons. When you take them off, you can't blow through them. They look good on the outside but swell shut internally from long term exposure to the brake fluid. You can horse down on the brake pedal and push fluid through them under pressure, but once released, the fluid is not under enough pressure to push back through the clogged hose, hence they drag. New hoses are less than 10 dollars each from Rockauto. Look at it this way, if you invest 30 dollars into new hoses and it doesn't fix the problem, you haven't really wasted any money, as 25 year old hoses aren't really a good idea on your braking systems anyway. Then, if you still have problems, you might look at a new combination valve which is significantly more expensive than hoses.
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01-29-2014, 11:09 AM | #11 | |
Project Heaven in my 67!!!
Join Date: Jan 2009
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Re: Prop Valve Question
Quote:
When I get home I am going to take the bed off of the truck and clean and paint the rear half of the truck like I did the front half, as well as do a flip kit on the rear axle. I was planning on replacing all of the rubber lines and I am going to replace the prop/combo valve at that same time. At this point I am just collecting parts for this job. |
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