HEAVY/ HEAVY DUTY BRAKESEXAM
2025 QUESTIONS WITH COMPLETE
SOLUTIONS.
in the AL factor the L refers to the? - ANSWERSlength 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? - ANSWERSB 20%
How much free movement should exist between a slack adjuster and its camshaft? -
ANSWERS.005 in. max
HYDRAULIC BRAKE - ANSWERSTHE ONLY MECHANICAL LEVERAGE THAT IS
USED IS IN THE FOOT PEDAL LINKAGE
HEAT DISSIPATION - ANSWERSBRAKE DRUM/ROTOR ACTS AS A HEAT SINK
AND A HEAT EXCHANGER
PRESSURE DIFFERENTIAL SWITCH - ANSWERSIS USED TO WARN THE VEHICLE
OPERATOR THAT ONE OF THE HYDRAULIC SYSTEMS HAS FAILED
BLEEDING THE BRAKES - ANSWERSThe process of using fluid pressure (brake fluid)
to force air out of the brake lines and components.
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?
- ANSWERSMisadjusted wheel sensor
THEORY OF OPERATION - ANSWERSBRAKES ARE DESIGN TO COVERT THE
ENERGY OF MOTION INTO HEAT ENERGY DISSIPATE THAT HEAT INTO THE AIR
COEFFICIENT OF FRICTION - ANSWERSthe ratio between the force necessary to
move one surface horizontally over another and the pressure between the two surfaces.
THE RETARDER HORSEPOWER - ANSWERSGENERATED 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 LINE - ANSWERSSystem of steel tubes and rubber hoses that contain
and move high-pressure fluid within a hydraulic system.
SERVICING THE HYDRAULIC BRAKE SYSTEM - ANSWERSIS A MATTER OF
ADJUSTMENTS, REPLACEMENT OF WORN OR DAMAGED PARTS AND
2025 QUESTIONS WITH COMPLETE
SOLUTIONS.
in the AL factor the L refers to the? - ANSWERSlength 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? - ANSWERSB 20%
How much free movement should exist between a slack adjuster and its camshaft? -
ANSWERS.005 in. max
HYDRAULIC BRAKE - ANSWERSTHE ONLY MECHANICAL LEVERAGE THAT IS
USED IS IN THE FOOT PEDAL LINKAGE
HEAT DISSIPATION - ANSWERSBRAKE DRUM/ROTOR ACTS AS A HEAT SINK
AND A HEAT EXCHANGER
PRESSURE DIFFERENTIAL SWITCH - ANSWERSIS USED TO WARN THE VEHICLE
OPERATOR THAT ONE OF THE HYDRAULIC SYSTEMS HAS FAILED
BLEEDING THE BRAKES - ANSWERSThe process of using fluid pressure (brake fluid)
to force air out of the brake lines and components.
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?
- ANSWERSMisadjusted wheel sensor
THEORY OF OPERATION - ANSWERSBRAKES ARE DESIGN TO COVERT THE
ENERGY OF MOTION INTO HEAT ENERGY DISSIPATE THAT HEAT INTO THE AIR
COEFFICIENT OF FRICTION - ANSWERSthe ratio between the force necessary to
move one surface horizontally over another and the pressure between the two surfaces.
THE RETARDER HORSEPOWER - ANSWERSGENERATED 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 LINE - ANSWERSSystem of steel tubes and rubber hoses that contain
and move high-pressure fluid within a hydraulic system.
SERVICING THE HYDRAULIC BRAKE SYSTEM - ANSWERSIS A MATTER OF
ADJUSTMENTS, REPLACEMENT OF WORN OR DAMAGED PARTS AND
