I agree Mark. I've run front disk brakes with no proportioning valve and standard rear brakes for years. They work great on dry pavement without locking the rears. The only time I managed to lock the rear brakes on my 63 American (ran for 6-7 years without a prop valve) was during a panic situation on damp concrete on a downward incline (coming off a bridge). All four wheels locked up immediately though, so a prop valve wouldn't have helped. A prop valve might make a big difference on wet or icy roads though. You won't know until it's too late. I bet under some conditions you (meaning me too) never notice the rears locking up. Note that 65-66 AMC cars with disks have no prop valve. The rear brake lock-up situation was handled by using a weaker non-servo rear brake setup. -------------------- Date: Friday, January 26, 2007 03:17 PM From: markprice242@xxxxxxxxxxxx Oh, yeah, I meant to add, if I ever get to it I will be adding the adjustable prop valve in place of the no prop valve at all setup on the American. It actually works fairly well right now. I have 83 discs up front with 205/60/15" tires 69 9" drums in the rear with 255/60/15 tires 1979 Mustang manual disc master which I have discovered is a 7/8" master. The pedal is firm, yet has feel to it. Takes a good solid effort to lock up the rears, with no loss of control and no front lockup before it stops. -- Mark Price markprice242ATadelphia.net Morgantown, WV _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list