USPS Exams 943, 944 & 945 | Latest Update 2026/2027 | 200
Questions and Verified Answers | Complete Q&A Guide | A+ Graded
1. Exam 943 is used to hire which type of USPS maintenance position?
A. Maintenance Support Clerk
B. Automotive Mechanics responsible for routine maintenance and repair
C. Automotive Technicians responsible for complex repairs
D. Mail Processing Equipment Mechanics
Answer: B. Automotive Mechanics responsible for routine maintenance and repair
Explanation: Exam 943 is a technical test used to hire Automotive Mechanics who perform routine types
of maintenance and repair on USPS vehicles. Exam 944 is used for Automotive Technicians who handle
more complex maintenance and repair.
2. Exam 944 is used to hire which type of USPS maintenance position?
A. Automotive Mechanics for routine repairs
B. Automotive Technicians for complex maintenance and repair
C. Maintenance Support Clerks
D. Building Maintenance Technicians
Answer: B. Automotive Technicians for complex maintenance and repair
Explanation: Exam 944 is used to hire Automotive Technicians who are responsible for more complex
types of maintenance and repair on USPS vehicles.
,3. What is the MOST important action to prevent accidental startup when repairing a conveyor motor
that cycles on during routine operation?
A. Place warning signs near the conveyor
B. Notify nearby employees of the repair
C. Apply lockout/tagout procedures and verify isolation
D. Remove loose clothing and jewelry
Answer: C. Apply lockout/tagout procedures and verify isolation
Explanation: Lockout/tagout (LOTO) is the primary method for controlling hazardous energy before
servicing equipment. Verification of energy isolation ensures the machine cannot start unexpectedly.
4. During maintenance of a beltdriven system, a technician notices a damaged guard. What should be
done FIRST?
A. Continue work and report the issue later
B. Remove the guard permanently
C. Replace or repair the guard before returning the equipment to service
D. Ignore the damage if the belt is still functioning
Answer: C. Replace or repair the guard before returning the equipment to service
Explanation: Safety guards must be in place before equipment is returned to service to protect
operators and maintenance personnel from moving parts.
5. What is the minimum brake pad thickness that requires replacement?
A. 1 mm
,B. 2 mm
C. 3 mm
D. 4 mm
Answer: B. 2 mm
Explanation: Brake pads at or below 2 mm thickness are considered unsafe and require replacement.
The friction material becomes too thin to provide adequate stopping power and may cause
metaltometal contact, damaging the rotors.
6. What condition results when a brake drum is out of round?
A. Low pedal
B. Spongy pedal
C. High pedal
D. Pulsating pedal
Answer: D. Pulsating pedal
Explanation: An outofround brake drum creates uneven contact between the brake shoes and the drum
surface during rotation. This causes the brake pedal to pulsate or vibrate when applied, as the shoes
alternately contact high and low spots on the drum.
7. What causes a soft, spongy brake pedal?
A. Bent caliper retainer
B. Air in the hydraulic system
C. Warped rotors
, D. Worn brake pads
Answer: B. Air in the hydraulic system
Explanation: Air in the hydraulic brake system is compressible, unlike brake fluid. When the pedal is
pressed, the air compresses instead of transferring hydraulic pressure to the brake calipers or wheel
cylinders, resulting in a soft, spongy pedal feel.
8. Why should brake fluid be changed regularly?
A. It evaporates over time
B. It becomes too thick
C. It absorbs moisture
D. It loses color
Answer: C. It absorbs moisture
Explanation: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This
absorbed water lowers the boiling point of the fluid and can cause internal corrosion in brake
components, leading to system failure.
9. The parking brake (emergency brake) typically operates which braking system?
A. Front disc brakes only
B. Rear brakes only
C. All four wheels equally
D. Hydraulic system
Questions and Verified Answers | Complete Q&A Guide | A+ Graded
1. Exam 943 is used to hire which type of USPS maintenance position?
A. Maintenance Support Clerk
B. Automotive Mechanics responsible for routine maintenance and repair
C. Automotive Technicians responsible for complex repairs
D. Mail Processing Equipment Mechanics
Answer: B. Automotive Mechanics responsible for routine maintenance and repair
Explanation: Exam 943 is a technical test used to hire Automotive Mechanics who perform routine types
of maintenance and repair on USPS vehicles. Exam 944 is used for Automotive Technicians who handle
more complex maintenance and repair.
2. Exam 944 is used to hire which type of USPS maintenance position?
A. Automotive Mechanics for routine repairs
B. Automotive Technicians for complex maintenance and repair
C. Maintenance Support Clerks
D. Building Maintenance Technicians
Answer: B. Automotive Technicians for complex maintenance and repair
Explanation: Exam 944 is used to hire Automotive Technicians who are responsible for more complex
types of maintenance and repair on USPS vehicles.
,3. What is the MOST important action to prevent accidental startup when repairing a conveyor motor
that cycles on during routine operation?
A. Place warning signs near the conveyor
B. Notify nearby employees of the repair
C. Apply lockout/tagout procedures and verify isolation
D. Remove loose clothing and jewelry
Answer: C. Apply lockout/tagout procedures and verify isolation
Explanation: Lockout/tagout (LOTO) is the primary method for controlling hazardous energy before
servicing equipment. Verification of energy isolation ensures the machine cannot start unexpectedly.
4. During maintenance of a beltdriven system, a technician notices a damaged guard. What should be
done FIRST?
A. Continue work and report the issue later
B. Remove the guard permanently
C. Replace or repair the guard before returning the equipment to service
D. Ignore the damage if the belt is still functioning
Answer: C. Replace or repair the guard before returning the equipment to service
Explanation: Safety guards must be in place before equipment is returned to service to protect
operators and maintenance personnel from moving parts.
5. What is the minimum brake pad thickness that requires replacement?
A. 1 mm
,B. 2 mm
C. 3 mm
D. 4 mm
Answer: B. 2 mm
Explanation: Brake pads at or below 2 mm thickness are considered unsafe and require replacement.
The friction material becomes too thin to provide adequate stopping power and may cause
metaltometal contact, damaging the rotors.
6. What condition results when a brake drum is out of round?
A. Low pedal
B. Spongy pedal
C. High pedal
D. Pulsating pedal
Answer: D. Pulsating pedal
Explanation: An outofround brake drum creates uneven contact between the brake shoes and the drum
surface during rotation. This causes the brake pedal to pulsate or vibrate when applied, as the shoes
alternately contact high and low spots on the drum.
7. What causes a soft, spongy brake pedal?
A. Bent caliper retainer
B. Air in the hydraulic system
C. Warped rotors
, D. Worn brake pads
Answer: B. Air in the hydraulic system
Explanation: Air in the hydraulic brake system is compressible, unlike brake fluid. When the pedal is
pressed, the air compresses instead of transferring hydraulic pressure to the brake calipers or wheel
cylinders, resulting in a soft, spongy pedal feel.
8. Why should brake fluid be changed regularly?
A. It evaporates over time
B. It becomes too thick
C. It absorbs moisture
D. It loses color
Answer: C. It absorbs moisture
Explanation: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This
absorbed water lowers the boiling point of the fluid and can cause internal corrosion in brake
components, leading to system failure.
9. The parking brake (emergency brake) typically operates which braking system?
A. Front disc brakes only
B. Rear brakes only
C. All four wheels equally
D. Hydraulic system
