Auto Service Professional

FEB 2016

Magazine for the auto service professional

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24 | February 2016 The Chassis the surfaces, reducing pad material buildup on the machined disc surfaces. Slotted rotors (with no cross-drilled holes) offer a more aggressive pad bite and greater strength (a prime consideration for racing conditions), while holes are a bit more "pad friendly." A combination of holes and slots are a good compromise for superior braking and extended pad life. In case you wondered, holes and/or slots are not for appearance only. They do serve a function, providing the placement and size of the holes/slots have been properly engineered for a given application. Never modify a rotor. If the customer wants drilled or slotted rotors, buy them as needed. Holes and/or slots are precision machined. Trying this on your own can lead to disc fractures and out-of-balance conditions. Rotor runout Whenever servicing used rotors, always take the time to make a few measurements, even if the customer hasn't complained about a bouncing brake pedal. Measure lat- eral runout, disc thickness and measure for thickness variation. Poorly machined or abused rotors, or rotors that have been warped as a result Rotors that feature cross-drilled holes and grooves are designed to reduce hydro-gassing between the pads and disc surfaces, as well as aid in pad debris removal. These features can promote superior braking by reducing gas buildup and increasing the coeffcient of friction.

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