Heavy / Heavy-Duty Brakes – Lecture Summary & Practice Questions
in the AL factor the L refers to the? - correct answer ✔✔length of the slack adjuster
Spring brakes on an air-brake vehicle must be able to hold the vehicle, facing uphill or downhill,
on what percentage grade? - correct answer ✔✔B 20%
How much free movement should exist between a slack adjuster and its camshaft? - correct
answer ✔✔.005 in. max
The warning light on a truck with a antilock brake system light when the truck is started. When
the truck is moving, the light stays on. which of the following could be the cause? - correct
answer ✔✔Misadjusted wheel sensor
THEORY OF OPERATION - correct answer ✔✔BRAKES ARE DESIGN TO COVERT THE ENERGY OF
MOTION INTO HEAT ENERGY DISSIPATE THAT HEAT INTO THE AIR
COEFFICIENT OF FRICTION - correct answer ✔✔the ratio between the force necessary to move
one surface horizontally over another and the pressure between the two surfaces.
THE RETARDER HORSEPOWER - correct answer ✔✔GENERATED BY THE BRAKES, THEN MUST BE
SEVERAL TIMES THAT OF THE ENGINE, OFTEN THE AMOUNTS TO OVER 100 RETARDING
HORSEPOWER AT EACH WHEEL END.
HYDRAULIC BRAKE - correct answer ✔✔THE ONLY MECHANICAL LEVERAGE THAT IS USED IS IN
THE FOOT PEDAL LINKAGE
HEAT DISSIPATION - correct answer ✔✔BRAKE DRUM/ROTOR ACTS AS A HEAT SINK AND A HEAT
EXCHANGER
in the AL factor the L refers to the? - correct answer ✔✔length of the slack adjuster
Spring brakes on an air-brake vehicle must be able to hold the vehicle, facing uphill or downhill,
on what percentage grade? - correct answer ✔✔B 20%
How much free movement should exist between a slack adjuster and its camshaft? - correct
answer ✔✔.005 in. max
The warning light on a truck with a antilock brake system light when the truck is started. When
the truck is moving, the light stays on. which of the following could be the cause? - correct
answer ✔✔Misadjusted wheel sensor
THEORY OF OPERATION - correct answer ✔✔BRAKES ARE DESIGN TO COVERT THE ENERGY OF
MOTION INTO HEAT ENERGY DISSIPATE THAT HEAT INTO THE AIR
COEFFICIENT OF FRICTION - correct answer ✔✔the ratio between the force necessary to move
one surface horizontally over another and the pressure between the two surfaces.
THE RETARDER HORSEPOWER - correct answer ✔✔GENERATED BY THE BRAKES, THEN MUST BE
SEVERAL TIMES THAT OF THE ENGINE, OFTEN THE AMOUNTS TO OVER 100 RETARDING
HORSEPOWER AT EACH WHEEL END.
HYDRAULIC BRAKE - correct answer ✔✔THE ONLY MECHANICAL LEVERAGE THAT IS USED IS IN
THE FOOT PEDAL LINKAGE
HEAT DISSIPATION - correct answer ✔✔BRAKE DRUM/ROTOR ACTS AS A HEAT SINK AND A HEAT
EXCHANGER
