Why Do Drum Brakes Lock up?

One of the most common causes of one or two wheel lockup on drum brake equipped vehicles is the service and/or parking brake adjustment. ... If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon.

How do I stop my brakes from locking up?

Take your foot off the brake pedal so your wheels can get enough traction to possibly unlock momentarily. Then reapply pressure to the brake if needed. Repeatedly (and quickly) press the brakes over and over until the brakes either disengage or bring you to a safe stop.

What causes rear drum brakes to drag?

Brake dragging is commonly caused by broken or weak springs on the drum brakes. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters.