Question

Two technicians are discussing disc brake rotor service. Technician A says that the inner races (bearing cups) should be removed from the rotor before it is mounted on the lathe. Technician B says that a non-directional finish on the rotor surfaces can be obtained by using sandpaper. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians
D) Neither technician

Answer 1

Answer:

B) Technician B only

Explanation:

When working on the lathe, the bearing cups serve as a centering device while the rotor is on a bench lathe.

The outer and inner bearing seal are grease before mounting the rotor on the lathe for one-piece rotors.

The rotor surface is required to be made non-directional after machining so as to enable the proper seat of the new pads to the rotor . The rotor surface should be dressed with 120-grit to 150-grit aluminium oxide sand paper mounted on a sanding disc power tool.