Q:

What are the signs of bad rotors?

A:

Quick Answer

Signs of bad rotors include vibration when the brake petal is depressed, and a visual inspection that reveals wear and tear. Rotors can be replaced or resurfaced unless they are under a certain thickness. A rotor that is too thin does not absorb the immense heat of the braking process and may crack or break while in use, causing brake failure.

Know More
What are the signs of bad rotors?
Credit: Geri Lavrov Photolibrary Getty Images

Full Answer

According to experts at Tomorrow's Tech, "The bottom line here is this: if a customers vehicle has a pedal pulsation, the rotors need to be resurfaced or replaced. You also need to measure rotor runout on the vehicle to determine if the problem is the rotor or the hub, so the appropriate corrections can be made."

Runout occurs when the rotor wobbles as it spins and can be measured with a dial indicator.

Rotors should be replaced if hard spots or cracks are present but can be resurfaced when they are grooved. Hard spots and cracks indicate inevitable rotor failure and resurfacing is not recommended for these conditions. Grooving occurs naturally during the braking process over a period of time and, assuming that the rotor is of an appropriate thickness, most motorists choose to resurface rotors rather than replace them initially.


Is this answer helpful?

Similar Questions

  • Q:

    Why does a car shake when applying the brakes?

    A:

    If the steering wheel or car shakes when the brakes are applied, it is almost certain that the problem lies with the rotors. This is an important distinction as steering wheel or car vibration can happen for a number of reasons, but if it only happens when the brakes are applied, this isolates the problem. Worn brake pads are another possibility, but if the pads have recently been replaced, then this leaves only the rotors as suspects.

    Full Answer >
    Filed Under:
  • Q:

    Why do my brakes grind when I come to a stop?

    A:

    If a car's brakes grind when the car comes to a stop, worn out or defective brake pads could be damaging the rotors of the brakes. Brake problems of any kind should be inspected and taken care of as soon as possible to avoid further damage and reduce the chances of the brakes failing entirely.

    Full Answer >
    Filed Under:
  • Q:

    What causes a bad brake booster?

    A:

    There are several things that can cause a bad brake booster including a bad vacuum. A brake booster needs vacuum pressure to work effectively so a lack of pressure can cause failures. Other causes of booster failure include broken springs and ruptured diaphragms.

    Full Answer >
    Filed Under:
  • Q:

    Do bad shocks make a noise?

    A:

    Bad shocks and struts sometimes make noises. When a vehicle's shocks go bad, the noises may be caused by friction or banging from bumps and vibrations.

    Full Answer >
    Filed Under:

Explore