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Re: Part No for Brake Combination Valve
Before changing the valve check the pressure between the valve and the master cylinder. It is far more likely that one of the rubber items in the brake system has failed, compared to a failure of a part with no rubber components. The rubber items will degrade over time or can physically react to different kinds of brake fluid.
The cups in the master cylinder and the hoses would be my number one items to check.
And if pressure tests of the master cylinder check out only then I would remove the valve to clean and verify the spool inside was stuck before buying another one.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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