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Please refer to the very informative Helitool website:
http://www.helitool.com/how_brakes_work.html
And I plagiarize thusly: "I previously stated that all drum systems require
a residual pressure check valve. There is one exception to this rule and
that is the double anchor system that Chrysler used on it's early products."
"Because the shoes rest on the upper adjustment cams they can't depress the
wheel cylinder piston any more than they are supposed to. As a result no
residual pressure check valves are required on our trucks whether you have
disc or original drum brakes or any combination."
BK
----- Original Message -----
..."Unfortunatly it is for 4 wheel disc so you may have to install residual
pressure check valves."
...or assurances that I don't need them? And what about a proportioning
valve for the rear brakes. Yes, no?
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