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Brakes 'grab' because when pressure is applied to the pedal, a device pumps fluid into a system that has a caliper (a squeezing device) that causes brake pads to squeeze the rotor (round, silver disc behind the wheel). It is quite simple.

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Obviously the opposite side brake is not working, or is out of adjustment. If disc brakes the side that is grabbing may have a binding caliper piston that has the lining on that side partly applied and dragging. Grease soaked brake lining from a leaking wheel seal will cause brake grab also. If drum brakes be sure both sides are adjusted equally, operate freely and have not grease or brake fluid leaks. On drum brakes the side that grabs is always the side the brake adjustment is set to tight on. Drum or disc brake, the side that grabs is the side with the defect. RE: soaked lining, adjusted to tight, caliper or wheel cylinder stuck or frozen, broken and or missing hardware. cracked drum, scored rotor etc.

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10y ago
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Q: Why do the brakes grab when applying the brakes?
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