Chapter 108 Machining Brake Drums and Rotors
Quiz by Matt Lobdell
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- Q1
Brake drums use ________ for the friction surface area.
carbon
aluminum
steel
cast iron
30s - Q2
Technician A says that hard spots in a brake drum should be removed using a carbide-tip machining tool. Technician B says that the drum should be replaced if hard spots are discovered. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q3
The major reason for brake pedal pulsation during braking is due to ________.
poor surface finish on the rotors
thin rotors
excessive rotor thickness variation
grooved rotors
30s - Q4
After machining a rotor, what should be done?
Installed on the vehicle
Rub the machined surface with a brake pad to burnish the surface
Clean the rotor with soap and water
Use new lug nuts when installing on the vehicle
30s - Q5
Typical maximum rotor thickness variation (parallelism)specifications is ________.
0.0005 inch (0.013 mm)
0.300 to 0.500 in. (8.0 to 13 mm)
0.003 to 0.005 in. (0.08 to 0.13 mm)
0.030 to 0.050 in. (0.8 to 1.3 mm)
30s - Q6
Typical maximum rotor runout specifications are ________.
0.030 to 0.050 in. (0.8 to 1.3 mm)
0.0003 to 0.0005 in. (0.008 to 0.013 mm)
0.003 to 0.005 in. (0.08 to 0.13 mm)
0.300 to 0.500 in. (8.0 to 13 mm)
30s - Q7
Rotor finish is measured in ________.
millimeters
centimeters
inches
microinches
30s - Q8
The lower the Ra of a rotor, the ________ the surface.
higher
rougher
lower
smoother
30s - Q9
The brake lathe arbor should be checked using a ________.
vacuum gauge
feeler gauge
thread pitch gauge
dial indicator
30s - Q10
A disc brake rotor is being machined. Technician A says that a feed rate of 0.0008 inch per revolution and 150 RPM is where the rotor should be set for a final cut. Technician B says that the rotor should be given a non-directional surface finish using 150 grit sandpaper. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q11
Technician A says that brake drums on the same axle should be close to the same inside diameter for best brake balance. Technician B says that a brake drum may be cracked if it rings like a bell when tapped with a light steel hammer. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q12
A hubless brake drum cannot be machined because it cannot be held in a lathe.
falsetrueTrue or False30s - Q13
The major reason for brake pedal pulsation during braking is due to excessive rotor thickness variation.
truefalseTrue or False30s - Q14
Two technicians are discussing hard spots in brake drums. Technician A says the drum should be replaced. Technician B says the hard spots are caused by using riveted rather than bonded brake shoes. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technicians
30s - Q15
Hard spots in a brake drum are caused by________.
excessive heat and pressure
improper mounting of the drum on the lathe
machining a drum at too high a speed
machining a drum without using a rubber belt to damper out the vibrations
30s