A brake caliper is the part that squeezes the brake pads against the rotor. When it works well, it squeezes when you press the pedal and lets go when you release it. A seized or sticking caliper doesn’t let go all the way. That can cause a lot of problems, and it’s very common in Ontario because of rust and road salt.
Signs of a seized brake caliper
- The car pulls to one side when driving or braking.
- A burning smell near one wheel after driving.
- One wheel is much hotter than the others after a drive. (Be careful, don’t touch it directly.)
- More brake dust on one wheel than the others.
- The car feels like it’s dragging, or it rolls less easily.
- Worse fuel economy than normal.
- One brake pad is worn much more than the others.
- A grinding or squealing noise from one wheel. See grinding noise when braking.
What causes a caliper to seize?
- Rusty or dry slide pins. Most calipers slide on pins that need grease. Salt and water wash the grease away and the pins rust. This is the most common cause.
- A rusted caliper piston. If the rubber boot around the piston tears, water gets in and the piston rusts.
- Old brake fluid. Brake fluid absorbs water over time, which can cause rust inside the caliper. Read brake fluid 101.
- Rusty pad brackets. Rust builds up under the pads and pinches them, so they can’t move freely.
- A car that sits a lot. Parts that don’t move are more likely to rust in place.
Is it safe to drive with a seized caliper?
Not for long. A stuck caliper makes the brake overheat. Heat can damage the rotor, burn through the pad, boil the brake fluid, and in serious cases damage the wheel bearing. It can also make the car pull when you brake hard. Get it checked as soon as you notice the signs.
How it’s fixed
- If only the slide pins are sticking: we clean them, grease them, and replace worn rubber parts. This is often done during a normal brake job.
- If the piston is seized or the caliper is badly rusted: the caliper needs to be replaced. It’s usually done with new pads, and often new rotors, because the heat damages them.
How to prevent it
- Make sure the slide pins are cleaned and greased every time your brakes are done.
- Flush your brake fluid every 2 to 3 years.
- Get your brakes checked once a year, especially after winter.
Think your caliper is sticking? We can check it today
President Tire & Wheels offers a free brake inspection and same-day brake service at 632 Colby Drive, Waterloo. Brake pads and rotors start at $350 per axle with a 1-year warranty, or $499 per axle with a 2-year warranty (most sedans). If a caliper needs replacing, we’ll give you the price before we start.
Get a free brake quote, see our brake service page, or call (226) 698-1667. Serving Waterloo, Kitchener and Cambridge.
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