What will excessive rotor thickness variation cause?
For example, excessive DTV is the leading cause of high speed pulsation complaints. Likewise, DTV is typically more pronounced when stopping from speeds above 35mph. This is caused by the changing thickness of the rotor thus causing the caliper piston to move in and out.
What does minimum thickness of a brake rotor mean?
The rotor’s minimum thickness tells you the minimum operational level of your rotor. This level can be found engraved on the sides of the rotor, within the veins of the rotor, or on the hat of the rotor.
Can you use vented rotors instead of solid?
Solid and vented rotors are NOT interchangeable. To switch from one to the other, you may need new calipers, pads, brackets, etc.
What is the minimum thickness of a brake rotor?
The lowest thickness measurement must not exceed the minimum thickness specification. Most rotors have a minimum thickness specification stamped somewhere on the hat portion of the rotor, this specification can also be found in the vehicle’s service manual. The brake rotor must not fall below the minimum thickness specification after resurfacing.
When to replace both brake rotors at the same time?
If its thickness is below the minimum specification and it cannot be resurfaced, then you need to replace the brake rotors immediately. It is recommended to replace both rotors at the same time, even if one still works as the difference in rotor thickness can result in the brakes pulling towards one side.
What causes the hub of a rotor to turn?
This may be due to runout in the hub, runout in the way the rotor was originally machined, rust or dirt between the rotor and hub, or uneven torquing of the lug nuts that cause distortion in the rotor and hub (which is why lug nuts should always be tightened to specifications with a torque wrench, not an impact gun).
Why are new rotors cheaper than old rotors?
New rotors reduce the risk of improper surface finish and too much runout (at least in theory). The second part of the answer involves money. The price of many aftermarket rotors has fallen drastically in recent years due to the availability of inexpensive rotors from China and elsewhere.