What is brake runout?
Lateral runout is the side to side movement of the brake rotor as it rotates. When this gets excessive, pad and rotor wear will result. This excessive movement will result in vibration and pulsation in the steering wheel or seat of a vehicle.
What is acceptable brake rotor runout?
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.
What causes runout?
Run-out or runout is an inaccuracy of rotating mechanical systems, specifically that the tool or shaft does not rotate exactly in line with the main axis. Radial run-out is caused by the tool or component being rotated off centre, i.e. the tool or component axis does not correspond with the main axis.
What is axial runout?
Axial runout is when the axis of rotation is tilted to some degree from the main axis, meaning the axis of rotation is no longer parallel to the main axis.
What is used to measure runout?
Runout is measured using a simple height gauge on the reference surface. The datum axis is controlled by fixing all datum points and rotating the central datum axis. The part is usually constrained with V-blocks, or a spindle, on each datum that is required to be controlled.
How can I control my runout?
How do you check runout?
Runout is a condition where the centerline of the coupling or shaft has deviated from its true axis of rotation. To measure coupling or shaft runout, it is common to use a dial indicator with a standard magnetic base. Simply mount the magnetic base on a stationary surface.