Brake pressure appears to be insufficient at rear wheel cylinders -1984 chevette drum. Made sure no air in lines already. Rear wheels will turn while in drive - will not hold while up on jack stands. Linings have been adjusted to maximum distance before locking drums. Is it the proportioning valve which appears to be none re-settable or is it the master cylinder going to bypass.
Oct 14, 2012 at 8:10 PM
