How thick do rotors need to be?
How thick do rotors need to be?
The standard solid rotor is 12mm (0.472 inches) thick. It should not be ground to less than 10.5mm (0.413 inches). The standard vented rotor is 20mm (0.787 inches) thick and should be ground to no less than 18.5mm (0.728 inches). It should not be more than 0.002 inch (0.050mm).
Should rotors be measured for thickness variation?
Brake disc thickness variation means variation in the thickest and the thinnest parts of the rotor. This causes the rotors to have an uneven wear. This is a rotor condition that one of the rotor surface is thicker than other….Typical run-out value.
| Vehicle | Run-out value |
|---|---|
| Luxury Cars | .50mm (0.019 in) |
What is the specification for maximum allowable thickness variation?
Typically, the average specification for DTV is . 0005″. On the other hand, the maximum allowable variation in thickness on a rotor is 5 ten thousandths of an inch.
How is thickness variation measured?
Run out needs to be measured with a dial indicator with the rotor mounted on the vehicle however, DTV can be measured using a precision micrometer off the vehicle. This is done by measuring the thickness of the rotor 25mm in front of the outer edge.
Do you need to measure the rotor thickness?
If you need to measure the rotor thickness, just follow the detailed testing procedure in any factory service manuals. The rotor thickness should be measured using a micrometer. The thickness should also be gauged before and after the rotors have been turned, to check for proper thickness or depth specification.
What should be the distance between the rotors?
While measuring, keep a distance of about 45’ apart and 10mm from the rotor edge. Importantly, all the readings should be above the minimum requirement for thickness.
How do you know if you need new rotors?
Use a micrometer at the thinnest point on the surface of the rotor where it meets the pads to measure the minimum operational thickness. If your rotor needs to be cut or has worn passed this thickness, you’ll need new rotors. You may also discover your rotor has Disc Thickness Variation.
How is the DTV of a brake rotor measured?
This means that the rotor is machined to match the hub. Rotor thickness should be measured in at least six areas of the rotor’s face. Generally speaking, the DTV should not vary more than 0.001”. Some manufacturers specify zero DTV.
If you need to measure the rotor thickness, just follow the detailed testing procedure in any factory service manuals. The rotor thickness should be measured using a micrometer. The thickness should also be gauged before and after the rotors have been turned, to check for proper thickness or depth specification.
While measuring, keep a distance of about 45’ apart and 10mm from the rotor edge. Importantly, all the readings should be above the minimum requirement for thickness.
This means that the rotor is machined to match the hub. Rotor thickness should be measured in at least six areas of the rotor’s face. Generally speaking, the DTV should not vary more than .001”. Some manufacturers specify zero DTV.
Use a micrometer at the thinnest point on the surface of the rotor where it meets the pads to measure the minimum operational thickness. If your rotor needs to be cut or has worn passed this thickness, you’ll need new rotors. You may also discover your rotor has Disc Thickness Variation.
