Problem:
After about 20 minutes of driving the LEFT REAR rim is very hot and the wheel is beginning to lock up due to dragging brake shoes, the master cylinder is hot, and the pressure point on the brake pedal when initial pressure is first felt has gone from midway down to almost no movement downward whatsoever. This problem began after I did the following work.
FRONT WHEELS - did complete brake job, i.e. new shoes, new wheel cylinders, drums turned, new brake return springs
RIGHT REAR WHEEL - new shoes
LEFT REAR WHEEL - new shoes
BRAKE LINES/HOSES - installed new stainless brake lines and rubber hoses
Master Cylinder - installed a new unit
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To date, I have (1) checked the linkage at the master cylinder, which will allow about a inch downward travel on the brake pedal before the rod in the MC starts to engaged, (2) readjusted the brakes and watched for brake drum drag on the shoes, (3) replaced the brake fluid, bench bled the MC and bled the brake lines, (4) replaced the LEFT REAR wheel cylinder, (5) turned the LEFT REAR drum, (6) inspected the other wheels for potential problems (7) installed a temporary helper spring on the LEFT REAR wheel in case the current brake return spring had lost some of its strength.
I have run out of things to try, and I could really use some good advice on this troublesome problem. There has to be something I am missing. The brake line running to the master cylinder and the master cylinder itself is close to the exhaust pipe, but the new stainless steel line to the master cylinder takes the same route as the old steel line.
Therefore, I doubt that this could present a problem. Anyway, I am open to and will appreciate all suggestions on ways to cure my brake problem.
