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-   -   Stuck Proportioning Valve (http://www.hotrodders.com/forum/stuck-proportioning-valve-225373.html)

wrb36usa 10-25-2012 09:49 AM

Stuck Proportioning Valve
 
I have a "49 Willys Jeepster Street Rod. It has Disc on the front & Drum on the rear. I just put a new Chrome Master cylinder & Chrome Booster & Brass Proportioning Valve on it and the Valve is stuck. The light indicator is on. How do I get it unstuck? Everything is now mounted on the car and master cylinder was bench bled. Thanks

delawarebill 10-25-2012 12:46 PM

brakes
 
i'm not sure what u are talking about.. a light ind????? the valve is stuck.. is that u can't adj it, or rear bks r locked up and wouldn't unlock ??? i just might be as simple as the brake peddle rod is adj'd too long and will not let fluid flow back..

enjenjo 10-25-2012 07:47 PM

Open a bleeder opposite the end you last bled.Push slowly on the brake pedal until the light goes out, close the bleeder. It should be centered.

wrb36usa 10-26-2012 07:53 AM

I have resolved the problem.
Thanks

wrb36usa 10-26-2012 07:59 AM

That solution solved the sticking problem. Many Thanks.
Maybe you can help with a new brake problem. I now have a good pedal but stopping the car is very difficult. It is acting like there is no power brake since I changed from an 11 inch booster and 1 1/16 bore master cylinder to a 7 inch booster and a corvette style master cylinder. I really seem to just have manual brakes with very little stopping power.

vetteman 10-26-2012 08:11 AM

Quote:

Originally Posted by wrb36usa (Post 1603272)
That solution solved the sticking problem. Many Thanks.
Maybe you can help with a new brake problem. I now have a good pedal but stopping the car is very difficult. It is acting like there is no power brake since I changed from an 11 inch booster and 1 1/16 bore master cylinder to a 7 inch booster and a corvette style master cylinder. I really seem to just have manual brakes with very little stopping power.

Maybe this will help.
http://www.mpbrakes.com/uploads/documents/optomize.pdf

enjenjo 10-26-2012 06:42 PM

Quote:

Originally Posted by wrb36usa (Post 1603272)
That solution solved the sticking problem. Many Thanks.
Maybe you can help with a new brake problem. I now have a good pedal but stopping the car is very difficult. It is acting like there is no power brake since I changed from an 11 inch booster and 1 1/16 bore master cylinder to a 7 inch booster and a corvette style master cylinder. I really seem to just have manual brakes with very little stopping power.

In my opinion, a 7" booster is just barely better than nothing. A 7" booster will produce less than half the boost than a 11" booster. And if you have a bit of cam, with low vacuum, it just makes it worse. The 1 1/16" bore master doesn't help either with a small booster. I have had some success switching to a 7" dual diaphream master cylinder in a case like yours, it still will not put out as much boost as a 11" booster, but it's much better than a single diaphream 7" booster. If that is not enough, you can change to a 1" Corvette style master cylinder, it bolts right in, and improves the mechanical advantage, at the cost of slightly more pedal travel.

wrb36usa 10-29-2012 06:16 AM

That info was really helpful. Wish I had known some of this before I bought the 7 inch booster.
Thanks

wrb36usa 10-29-2012 06:18 AM

I have the Corvette style Master cylinder. guess I will need to go to a larger booster.
Thanks


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