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Old 05-09-2012, 11:06 AM
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S-10 front brakes sticking

I am running an S-10 front end on a 40 Willys and I am having a problem with the front brakes sticking on after driving a few miles. I have had the rotors turned and replaced the calipers with reman units from Napa and put on new pads. Also, the hoses were supposedly replaced before I bought the car. Car has very few miles on it. I could use some good ideas on where to look first.

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Old 05-09-2012, 12:07 PM
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Brakes hanging up

A little more info on the initial thread. While the brakes were stuck on I cracked the line that ties the two front brakes together and both wheels immediately freed up. Tells me that the problem is not at the wheel end of the system. I will take it out for a spin and when they get tight I will then release the pressure at the master cylinder.
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Old 05-09-2012, 12:22 PM
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Try shortening the master cylinder activation rod a little. It may be a touch to long so the fluid cant bleed back. I have seen this many times before. If the rod is not adjustable you may be able to shim the master off the firewall with some washers just to test the theory
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Old 05-09-2012, 02:35 PM
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Brakes hanging up

I shortened the push rod. No help. I checked the plastic check valve in the power booster and it seems OK. It was free and only working one way with no leaks the other way. What I have isolated the problem to is a small 2 ounce check valve in the brake line. When I crack the line between the check valve and the master cylinder the wheel is still locked up. When I crack the line down stream of the check valve the brakes release and all is well. Now all I have to figure out is what the check valve is for and what the problem is with it. I have two valves, one in the front system and one in the rear system. I understand you need to have two of them if your running 4 wheel disc brakes.

I just found this on line. Do not use a residual pressure valve with 4 wheel Disc brake systems. The residual pressure will cause the calipers to drag.

Last edited by dilligaf; 05-09-2012 at 03:02 PM.
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Old 05-11-2012, 10:22 AM
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If the residual valve does not fix it, then my bet would be on failing brake lines at the caliper. It is comon for the inner wall of the line to collapse under pressure retaining pressure in the line. I dont care if "the other guy" said they were new... if you didnt put them on there yourself, dont assume hes right
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Old 05-12-2012, 03:26 PM
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Brakes hanging up

The residual valves seemed to be the problem. The brakes do not lock up now. However the brakes will not lock up the wheels when I make a panic stop. With this light car and four wheel disc brakes I would thing it would stop easier than it does. I have noticed that there is no proportioning valve. I plan on putting that in the first of the week.
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