What causes rotors to be scored but pads are worn down?

What causes rotors to be scored but pads are worn down?

The score marks go all the way around the rotor. The other 3 rotors look fine. What’s interesting is that my brake pads still have life in them. I also do not notice any noises when braking. What could cause rotors to be scored before the pads are worn down? Should I replace my rotors or keep driving with them since there aren’t any symptoms yet?

What causes a rotor to hit the caliper bracket?

However, in such cases, the grooves are small and have the same shiny look as the rest of the rotor. What you’ve got going on looks a lot more like when the rotor is hitting the caliper bracket. The most typical cause is a bad hub bearing, which is allowing the hub flange to move around and hit the stationary bracket.

Do you make noise when your rotors are worn down?

Nope, not always. You generally get noise when the actual balls or rollers have worn into odd shapes (they’re no longer round). But sometimes the bearing still rolls smoothly, but the races are worn and some extra clearance has been created. This results in play that can be felt by raising the car and shaking the wheel back and forth.

Is it normal for brake hubs to be rusty?

Click to expand… Yes, the hubs are rusty, but I don’t think there is a way around it, since the car has been garaged most of its life. The rest of the car is quite free from rust. Pad wear looks normal from all 4 sides on the left rear brake.

What causes brakes to shimmy right after rotor and pad?

The shimmy feeling that comes from brakes is usually due to uneven friction material build-up on the rotor. This transfer from pad to rotor is supposed to happen, indeed it makes the brakes work better, which is why brakes function better after break-in.

What should eccentricity be on rotor and pad?

Thickness eccentricity should be zero, must be under .0015″. Check all installs with a dial indicator for runout. Spin the rotor with indicator at 90 degrees on the rotor face near the outer edge. Runout should be zero, must be under .004″, the less the better. Clean pad back, piston, and caliper. Replace shims.

What causes friction build up on a rotor?

There are four major reasons for uneven friction buildup on rotors: Rotors were of uneven thickness when new. Rotors were eccentric when new or as installed. Uneven pad engagement. Improper break-in (a.k.a. “bedding”).

What to do if your brakes pulsate after rotor and pad?

Check all installs with a dial indicator for runout. Spin the rotor with indicator at 90 degrees on the rotor face near the outer edge. Runout should be zero, must be under .004″, the less the better. Clean pad back, piston, and caliper. Replace shims. Proper and complete lubrication of all metal-to-metal contact points.