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Old 04-03-2009, 06:47 AM
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Brakes hanging up

My front disc brakes "hang up" once in a while. This is on my Hi boy. I have a dual master cylinder mounted below floor. I do have a prop. valve and residual valves on front and back. If i crack open the bleeder on caliper it releases pressure and all is fine for a little while. Could I have a faulty front Res. valve? I thought that I saw a little brake fluid at fitting going to res. valve, but wiped off and did not see any more. Not losing any noticable amount of fluid.
Also to add that pedal normally has non power brake feel until the problem occurs, then the pedal is "stiff" with no play at the top. I haven't taken anything apart yet. Wanted to get feedback first.
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Rick

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Old 04-03-2009, 07:03 AM
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Having a front RV will cause fluid to come out of the bleeder.

Limit residual valve to about 2 lbs. This is if the MC is below the level of the calipers.

The MC push rod length may need adjusting. Usually a bit of free play is needed.

The piston/seal may be sticking in the bore of the caliper.
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Old 04-03-2009, 09:41 AM
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adjust the free play in the peddle. you need about 1/8 or so. Other wise it will not uncover the return bleed hole in the M/C. If that does not do it, look at the caliper it self. They can stick.

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Daves Hot Rod shop KC Mo
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Old 04-03-2009, 12:52 PM
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Thanks for the reply. I am sure it is not the caliper because it is BOTH calipers. I will check rod free play again, but I believe it is OK. I sort of ruled out the MC piston staying in because the pedal got stiffer at the top than usual. My thinking on this was that if the piston were staying in, I would have MORE play at the top of the pedal.
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Rick
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Old 04-03-2009, 01:10 PM
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What type of brake system did the prop. valve come from- all disc, all drum or half and half?
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Old 04-04-2009, 06:23 AM
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Prop. valve is new aftermarket adjustable. I put about 300 miles on car since that was installed, along with residual valves.
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Old 04-12-2009, 08:06 PM
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They make two different types of residual pressure valves -- 2 pounders and 10 pounders. The 10 pounders are for drum brakes, the 2 pounders are for disc brakes. Check to make sure you have the correct ones installed for your application...if you have 10 pound residual pressure valve installed in a disc brake application, the pressure you induce when you apply the brake will stay in the system until you relieve the pressure, i.e. open the caliper bleeder.
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