My car shakes when I brake

What to do right now

Keep driving normally but pay attention to how bad it gets. If the shaking is mild and only shows up above 50 mph, you have some time. If the pedal feels soft, sinks, or the shaking is getting worse fast, that's different, get it looked at right away rather than waiting for a routine appointment. This is not something that fixes itself, and it will not get better on its own. It usually gets slowly worse over weeks or months.

What usually causes it

Most of the time this is the front brake rotors. They wear unevenly over time, especially if a car sits for a while or gets driven hard and then cooled down quickly, and that unevenness is what you feel as a pulse through the pedal or the wheel. That's the common answer, by far.

Less commonly it's a loose wheel bearing, a bent rim, or a tire with a belt starting to separate. Warped rotors show up specifically under braking. The other causes tend to show up all the time, not just when you brake.

How to tell them apart

Shaking that only happens when you press the brake, and goes away the instant you let off, points to the rotors. Shaking that's there all the time, brakes or not, especially at highway speed, points more toward a tire or a wheel bearing.

Feel where it shows up. Shudder mainly in the steering wheel usually means the front rotors. Shudder mainly in the seat or the pedal itself, without much in the wheel, can mean the rear rotors instead. Neither of these is exact, it's just a decent first guess before someone puts the car on a lift.

A grinding or metal-on-metal noise on top of the shaking means the pads have worn through and it needs attention sooner, not later.

What the repair involves

If it's the rotors, the usual fix is replacing the front rotors and pads as a set, since resurfacing rotors is less common now than just replacing them. Rear rotors and pads get done the same way if that's where the wear is. Cost depends on the car, what parts it takes, and whether both axles need it, so it varies enough that we won't guess a number here, but it's a routine job, not a major one.

If it turns out to be a wheel bearing, that's a different repair and usually a bit more involved. If it's a tire, that's a tire shop conversation, not a brake one. Either way, the only real way to know for sure is to get the wheels off and look at the rotors, pads, and bearings directly, which takes maybe half an hour once the car's up on a lift.

Auto Star in Graham does brake diagnosis and repair, and can look at it and tell you plainly what's actually worn versus what's fine. Open Monday through Saturday, 8 to 6.