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Handling Tech: 4G63 suspension, steering, brakes, tires, lightweight wheels, bushings, etc.

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Old 04-30-2009, 12:56 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
DSM Wiseman
 

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How to test a brake proportioning valve?


I've completely dismantled my braking system during my rebuild (brake lines, booster, master cylinder, proportioning valve, front calipers, etc.), and cleaned all the lines and valve. The booster and master are new, and I'll be replacing the lower rubber factory lines with some coated stainless ones.

Needless to say, there hasn't been an ounce of fluid anywhere except what's caught in the hardlines going from the firewall to the rear wheels (which still have the calipers and lines attached) for several months now.

So anyway...before I add new fluid and set about bleeding the sytem, is there a way to test my proportioning valve and make sure it isn't stuck and is working properly? If it needs to be replaced, I'd much rather do it while everything is dry and the motor is still out.

I'm also wondering how critical it is to bench bleed the master, if I use one of those vacuum/pump bleeders. It seems as though I should be able to pull (or push) fluid through the entire system with one of those.

(Does the factory bench bleed the master and PV before assembly? hmmmm)



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