Rear brake proportioning valve options on 1985 GSL
07-17-18, 01:37 PM
#1
Full Member
Thread Starter
Rear brake proportioning valve options on 1985 GSL
Went thru tech section and it appears that many FB owner don't run this valve. And from talking to other Rotor-heads; many replace with aftermarket. Questions: 1) What is the reduction of brake efficiency (or reduced stopping distance) if not running this valve. 2) What is most common aftermarket valve and how do you have balance set-up. I am having trouble finding OEM replacement (any recommended sources). Thanks.
07-17-18, 03:13 PM
#2
Waffles - hmmm good
iTrader: (1)
Replacements are from used sources. I don't think a new one will be found. Not running one will cause brake imbalance on hard stops and possible uneven wear. You should use one. For drum rears this is especially true but for disc I don't know how critical it is.
07-18-18, 08:16 AM
#5
Waffles - hmmm good
iTrader: (1)
My 80 has a proportioning valve hanging off the side of the master which the rear drum lines go through. You need the valve for drums so they maintain a minimum pressure to make them stay slightly out against the drum, otherwise they would rattle around in the drum and not work right. I would think your 79 is missing this but would have had it when new.
07-18-18, 08:19 AM
#6
My 80 has a proportioning valve hanging off the side of the master which the rear drum lines go through. You need the valve for drums so they maintain a minimum pressure to make them stay slightly out against the drum, otherwise they would rattle around in the drum and not work right. I would think your 79 is missing this but would have had it when new.
07-20-18, 05:48 PM
#7
Freeskier7791,
When you did you T2 brake install, did you do the rear brakes also? If not, that would explain your front lock-up. We did that with our endurance racer and the car lost braking ability (because of the lock-up) and ruined a lot of tires. Installing the T2 (or at least 2nd gen) brakes on the rear solved the problem.
Carl
When you did you T2 brake install, did you do the rear brakes also? If not, that would explain your front lock-up. We did that with our endurance racer and the car lost braking ability (because of the lock-up) and ruined a lot of tires. Installing the T2 (or at least 2nd gen) brakes on the rear solved the problem.
Carl
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07-27-18, 10:51 AM
#8
Senior Member
Freeskier7791,
When you did you T2 brake install, did you do the rear brakes also? If not, that would explain your front lock-up. We did that with our endurance racer and the car lost braking ability (because of the lock-up) and ruined a lot of tires. Installing the T2 (or at least 2nd gen) brakes on the rear solved the problem.
Carl
When you did you T2 brake install, did you do the rear brakes also? If not, that would explain your front lock-up. We did that with our endurance racer and the car lost braking ability (because of the lock-up) and ruined a lot of tires. Installing the T2 (or at least 2nd gen) brakes on the rear solved the problem.
Carl
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