What is acceptable rotor runout?
What is acceptable rotor runout?
A runout of 0.0005 inch (0.00254 mm) at the bearing flange could result in a 0.001 inch (0.025 mm) runout at the rotor friction surface. The maximum allowable runout at the rotor friction surface is 0.002 inch (0.050 mm) as stated by most manufacturers.
How do you fix brake rotor runout?
Rotor Runout Measurement
- Mount the dial indicator to a rigidly secure portion of the suspension, like the knuckle.
- Tighten down the rotor with the correct conical washers to the recommended lugnut specification.
- Set the dial to zero and turn the rotor.
- Mark the high and low spots of the runout.
- Remove the rotor.
How do I check my disc rotors?
If you have an open-spoke wheel design, you can run your finger vertically down the brake rotor friction surface. If you can feel and see noticeable grooves, then it’s time for new brake rotors. For cars with hub caps that don’t expose the rotor, you will need to remove your wheel to inspect your brake rotors.
How to check rotor runout on new wheel?
Check bearing flange runout: Flange run out is magnified at the rotor friction surface. Install new rotor: Torque the rotor on the flange to check alignment to the knuckle. Check new rotor runout: It’s a double check before installing the wheel. Check lateral runout: mark high and low spot, a shim maybe required to correct the runout.
Can a disc brake rotor warp during service?
Many people believe that disc brake rotors can warp during normal service. Tales sometimes, even told by OE Dealerships, will state that you should not apply your brakes. They will also tell you not to drive through a deep puddle when it’s raining because if the rotor is hot from hard application and then gets drenched, it will warp.
What does runout mean in a disc braking system?
The term “runout” is used to describe the amount of wobble occurring when an element rotates. In a disc braking system, the brake rotor runout must be minimized so that the brakes do not shake and vibrate when engaged. Measuring the runout will allow a service technician to determine if…
Can a brake rotor be turned if runout is too high?
If runout exceeds factory specified maximum allowed value, the brake rotor can be turned, as long as it meets the minimum required thickness value. If the rotor thickness is less than the factory specified minimum required thickness, it should be replaced.