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J-(Chicago) · 10-28-2007, 07:27 PM

The metering valve, pressure differential switch and proportiong valve all are set to spec by the weight of the vehicle.

You want your rear brakes to engage slightly before your front, and if you can't even bleed them, I'd imagine the ratio is WAY off.

The proportioning valve only lets a certain portion of the pressure through to the rear wheels so that the front wheels apply more braking force. So if equal braking was to go to all four wheels the rears should lock up first. If your valve was set at 80%, and the brake pressure was 100 psi your rear brakes would get 80psi

I just boneyarded a few and used the one that worked the best.
The second one I tried worked nice so I kept it on.

Sorry I can't be of more help. Ready your line wrenches soldier.
Perhaps you could engineer a homemade psi valve testing rig, and rent it out to the rest of us when ours go bad

10-28-2007, 07:27 PM	#5 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 1,406	The metering valve, pressure differential switch and proportiong valve all are set to spec by the weight of the vehicle. You want your rear brakes to engage slightly before your front, and if you can't even bleed them, I'd imagine the ratio is WAY off. The proportioning valve only lets a certain portion of the pressure through to the rear wheels so that the front wheels apply more braking force. So if equal braking was to go to all four wheels the rears should lock up first. If your valve was set at 80%, and the brake pressure was 100 psi your rear brakes would get 80psi I just boneyarded a few and used the one that worked the best. The second one I tried worked nice so I kept it on. Sorry I can't be of more help. Ready your line wrenches soldier. Perhaps you could engineer a homemade psi valve testing rig, and rent it out to the rest of us when ours go bad __________________ I'd rather have a numbers matching poker hand. Last edited by J-(Chicago) : 10-28-2007 at 07:37 PM.