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Moisture and rust can cause the brake lining toseize to the brake drum and cause a huge problem to get themto release. Bent brake shoes or brake shoe anchorplates can cause a sticking problem. A bent shoe or anchorplate will cause the shoe to contact the brake drumunevenly.
In this way, what causes a drum brake to lock up?
Rear drum brakes can lock for severalreasons. One reason could be a defective wheelcylinder, which is part of the brake system. Yourbrake cable could also be adjusted too tight. The slightestpressure on the brake pedal, will then cause thebrakes to work at full force, causing the lockup.
- Unusual brake pedal feel. One of the first symptoms of bad orfailing drum brakes is unusual brake pedal feel.
- Scraping noises when brakes are pressed. Another symptomcommonly associated with bad brake drums is abnormal sounds.
- Loose parking brake.
In this way, why are my back brakes sticking?
Sometimes brake caliper sticking is caused by thepiston. This boot is easily torn when retracting the pistonback into the caliper while replacing the brake pads.If it gets torn, then rust and other debris can build up inside thecaliper and cause the piston to not slide smoothly.
Just like with the master cylinder not releasingcausing the brake drag, a caliper not releasingand staying applied can do the same thing. This is usuallycaused by a bent caliper mounting bracket or severely warpedrotors and pads. To correct, visually inspect the alignment betweenthe caliper and rotor.