A sticking brake caliper keeps its pads pressed against the rotor after you release the pedal. The usual signs are the vehicle pulling to one side, a burning smell or smoke from one wheel, one wheel much hotter than the others, uneven pad wear and a dragging feel. Most sticking calipers come from seized slide pins or a corroded piston, and the fix is to service or replace the caliper before it overheats the brakes.
Sticking brake caliper symptoms
- The vehicle pulls to one side while driving or braking
- A burning smell, or smoke from a wheel after a drive; see burning smell from car
- One wheel much hotter than the others; check carefully without touching the rotor
- Uneven pad wear, with one pad worn far more than the other
- The vehicle feeling sluggish, as if the brakes are slightly on, and worse fuel economy
What causes a caliper to stick
- Seized slide pins: on floating calipers, dry or corroded pins stop the caliper sliding back.
- Corroded piston: a torn dust boot lets in water and dirt, so the piston will not retract.
- A collapsed brake hose: the inner lining can act like a one-way valve and hold pressure on the caliper.
- Parking brake hardware: on rear calipers with an integrated parking brake, the mechanism can seize.
Steering wheel shakes when braking
Shaking through the steering wheel or a pulsing pedal when braking usually means uneven rotor thickness, often called warped rotors, which a sticking caliper can cause by overheating one rotor. Worn suspension or steering parts can make the shake worse. Replace or resurface the rotors and fix the cause, or the shake returns.
How to fix a sticking caliper
- Remove the caliper and pads and check that the piston retracts smoothly.
- Clean and lubricate the slide pins with brake-specific grease, replacing pins and boots if worn.
- Replace or rebuild a caliper with a seized or corroded piston; replace a collapsed hose.
- Fit new pads if they are worn or contaminated, and check the rotors.
- Bleed the brakes; see how to bleed brakes.
Do not keep driving on a caliper that is dragging hard. It can overheat the brakes, boil the fluid and fade the brakes when you need them.
Upgrading rear calipers on GM heavy-duty trucks
For 2013-2025 Chevrolet and GMC 2500 and 3500 trucks, the SSBC-USA B8-Barbarian rear caliper upgrade kit ($2,031.00) replaces the rear calipers with 8-piston calipers machined from billet aluminum. It bolts to the stock axle with OEM hardware, works with the factory hydraulics and ABS, and ships fully assembled with high-friction, low-dust semi-metallic pads; each caliper has four stainless bleeders.
Its pistons are stainless steel with square-cut pressure and dust seals. See also how long do brake pads last.
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