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
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.Learn more in Brakes
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 >
Symptoms of a bad master cylinder include leaking fluid, fading pedal and bad brake fluid. When the brake pedal starts to sink, becomes unresponsive or feels spongy, the master cylinder is malfunctioning. A bad master cylinder does not transfer the power from the brake pedal to stop the vehicle safely.Full Answer >
Bad ground wires are usually attached to an accessory or engine component affected by a symptomatic electrical glitch. If the ground wire is loose, it may need to be reattached firmly; if it appears attached, a voltmeter can be used to locate breaks inside the wire's cladding.Full Answer >
Common causes of uneven brake pad wear include driving with warped rotors, a clogged brake line or leaky calipers. Vehicles that are heavier in the front than in the rear can wear brake pads unevenly due to an uneven distribution of weight. Debris in the breaking system, such as rocks or other foreign objects, wears brake pads down unevenly as well.Full Answer >