310T Practical Skills and Training 2

Question 1

When performing a brake chamber stroke check on a service brake, the pushrod stroke must not exceed which limit to pass inspection?

Accepted Answer

The readjustment limit specified by FMCSA

Answer

FMCSA regulations define readjustment limits for each brake chamber size, and a stroke exceeding that limit requires immediate adjustment.

Question 2

A technician notices the air dryer purge valve is leaking continuously. The MOST likely cause is:

Accepted Answer

Failed purge valve solenoid or seat

Answer

A continuously leaking purge valve typically indicates a failed solenoid, a worn valve seat, or debris preventing the valve from fully seating.

Question 3

When adjusting automatic slack adjusters on S-cam brakes, if adjustment continues to back off after the wheels turn, what is indicated?

Accepted Answer

The S-cam bushings are worn

Answer

Automatic slack adjusters that repeatedly back off often indicate worn S-cam bushings or tubes, which prevent proper cam rotation and cause the adjuster to reset.

Question 4

What is the correct procedure when bleeding air from hydraulic brake lines on a coach equipped with a hydroboost system?

Accepted Answer

Bleed with engine running to maintain hydraulic pressure

Answer

Hydroboost systems require the engine to run during bleeding so hydraulic pressure is available for proper pedal feel and complete air purging.

Question 5

During a pre-trip inspection, a driver reports the low air warning buzzer activates before the vehicle reaches operating pressure. Which component should be checked FIRST?

Accepted Answer

Low pressure warning switch calibration

Answer

If the warning activates prematurely, the low-pressure switch may be out of calibration or faulty, triggering the alarm at the wrong pressure threshold.

(310t) Truck and Coach Technician Certification Practice Test

(310t) Truck and Coach Technician Certification Practice Test

310T Practical Skills and Training 2