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Old 03-11-2005, 09:26 AM
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Tripped Combination Valve

I have a 7" Booster under floor, Corvette Dual MC, Combination Valve and 2# Residuals in the front and 10# Residual in my 9" Ford Rear on my 34 Ford Coupe.

How do you check for a tripped combination valve? The combination valve is an aftermarket unit with a plastic fitting on the side and a plastic pin in the middle of the fitting. If it is tripped...how do you reset it?

Not getting much pressure to the rear. If the valve isn't tripped...I guess I'll have to buy a line pressure gauge and work from the rear wheel cylinders forward.

All input will be greatly appreciated.

Sweet-34

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Old 03-12-2005, 07:02 AM
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The only time I have had much luck with combination valves is when I used the matching front and rear brakes from the combination valve donner car. In your case of disc/drum on a 34 Ford, I would toss the combo valve and install a adjustable proportioning valve. While costing near $70, it is the quickest, most reliable way to get your brakes dialed in!!

Trees
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Old 03-12-2005, 11:31 AM
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Speedway has a generic adjustable PV for less than $40.
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Old 03-12-2005, 12:21 PM
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Try pushing the pin in the middle in. It might go kinda hard, but it should push in. The rear brakes were the same way on my '84 Chevy plowtruck. Also, whatever you do, DO NOT use heat to aid in moving the button.

Hope that helps, Chet.
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Old 03-16-2005, 07:30 PM
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Problem Solved

When I replaced the MC, I didn't notice that I was sold an 1 1/8th. bore instead of the 1" bore I needed. Now I'm getting the pressure needed to activate the rear drums. The valve wasn't tripped. Thanks for your help....

Sweet-34
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Old 03-22-2005, 04:57 AM
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Found Answer To Tripped Valve

Attach a test light to a positive 12-volt source. Touch the point of tester to the pin in the center of the plastic plug on side of combination valve. If NO light goes on the system is operating correctly.

If light goes on...this indicates the pressure valve is stuck in front or rear position.

Bleed brake system to determine which system...front or rear is not getting proper flow of fluid. One system will squirt fluid...other system will trickle.

The system with the flow must be opened for flow to alter the pressure on opposite side to center valve.

Slowly depress pedal with steady pressure until light goes out. When light goes out close bleeder.

The system is now centered. Bleed complete system.

Sweet-34
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