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Old 09-07-2024, 07:04 PM   #1
64stpside
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Join Date: Aug 2015
Location: old hickory, tn
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Inital adjustment on willwood adj prop valve on 4 wheel disc brakes??

Hey guys,
I just got a 4 wheel disc brake kit from (auto city classic/toms classic) put on my 64. I decided on a willwood adjustable proportioning valve (the grey one, line in, line out, screw adjuster). I put the screw adjuster on the valve 1/2 way between all the way out and all the way in to start. I took it around the neighborhood and it seemed to do good but i haven't gotten into "panic stops" yet.
Just looking for anyone with experience with these wilwood adjustable valves on where your initial adjustment was.
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Old 09-07-2024, 07:33 PM   #2
geezer#99
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Re: Inital adjustment on willwood adj prop valve on 4 wheel disc brakes??

You gotta go test.
Hammer the pedal down and adjust from there.
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Old 09-08-2024, 03:22 PM   #3
theastronaut
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Re: Inital adjustment on willwood adj prop valve on 4 wheel disc brakes??

Go out and bed in the pads pretty heavily to start with, so the rotors have a transfer layer established and the pads bite like they should, then do some panic stops to see if the back locks up first or not. Adjust it until the back locks up just after the front.

Note that some pads perform noticeably different when hot, so do your testing after the brakes have cooled back down to a normal temp between panic stop tests to simulate the most normal circumstances. Next time you change pads you'll want to bed those in and recheck that the new pads have the same f/r balance and make adjustments if necessary. Different pads have different coefficient of friction.
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