Mechanics

F150 DRUM BRAKES LOCK UP AND PULSE BADLY (REAR BR

1998 Ford F-150

Brakes problem
1998 Ford F150 V8 Four Wheel Drive Automatic 190000 miles

Rear brakes locking up!
1) Replaced front and rear e-brake cables (they were rusted and bound up)

2) Replaced shoes, hardware and drums.

3) Wheel cylinders are not leaking.

STILL LOCKING UP AND PULSATING

The few mechanics looked at it are baffled.

HELP!
Avatar
Eastcoastmc
August 13, 2009.



What kind of shoes are you using? If they are reman the odds are good that the curve is incorrect causing too much shoe contact in the drum, which causes lock up.

Tiny
Jack42
Aug 24, 2009.
Thanks for the reply.

The shoes are not reman.

This was happening prior to replacing shoes, hardware, drums, e-brake cables.

Eastcoastmc

Tiny
Eastcoastmc
Aug 24, 2009.
Both lock up at the same time?

Tiny
Jack42
Aug 24, 2009.
Yes, both sides lock up at the same time.

Tiny
Eastcoastmc
Aug 24, 2009.
Usually a pulsation in the rear indicates they are out of round (egg shaped). What brand of shoes/drums did you use? Have the drums been checked for being out of round? Are the primary and secondary shoes in the correct spots? Sorry for the basic questions, this is all stuff I would check first if I had the vehicle

Tiny
Jack42
Aug 24, 2009.
Are you having any other issues such as ABS light on or check engine light on?

If sensor on rear end has issues it will sometimes cause lock up as described. Another thing is Ford had some issues with shoes grabbing early in morning on dewey or rainy type mornings on those vehicles and was almost a characteristic.

Tiny
Mjr346
Aug 24, 2009.