Seized-Part Job · Car & Truck

How to Remove a Brake Rotor Stuck to the Hub

Caliper is off. Rotor stays. It has decided it lives here now.

A rotor that will not come off after the caliper and bracket are removed is rusted to the hub face and around the center pilot. Check for a retaining screw first. Then use penetrant, shock, and the rotor’s own threaded holes if it has them.

The Method

Step by Step

1
Check for retaining screws
Many rotors have one or two small screws holding them to the hub. Remove them first (an impact driver helps).
2
Soak the joint
Spray penetrant around the center bore and around each wheel stud where it passes through the rotor hat.
3
Strike the hat, not the friction surface
With a heavy hammer, hit the hat section between the studs, rotating the rotor as you go. Only do this if the rotor is being replaced.
4
Use the jacking holes
Some rotors have threaded holes in the hat. Run bolts of the matching thread in evenly and they push the rotor off the hub.
5
Clean the hub face
Wire-brush the hub face to bare metal so the new rotor sits flat. Rust on the hub causes runout and a pulsing pedal.

Heat call: No heat

Heat near the hub can damage the wheel bearing grease and seals. Leverage and shock work better here anyway.

Safety

Keep penetrant off the new rotor and pads. Clean the new rotor with brake cleaner before installing.
Wear eye protection when striking rusty parts. Scale flies.

What to Spray