USPS Exams 943, 944, 945 NEWEST EXAM 2026-
2027 COMPLETE 50 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED
Air Suspension Systems - CORRECT ANSWER: - pressure is used adjust high and firmness of
the ride by regulating air pressure of airbags withing the suspension.
Alternator - CORRECT ANSWER: responsible for charging the battery while the vehicle is
running
Anti-lock Braking System (ABS) - CORRECT ANSWER: prevents wheels from locking up
during emergency braking by continuously monitoring wheel rotation and adjusting break
pressure accordingly
Bleeding the Brakes (Two-man) Breakdown - CORRECT ANSWER: - raise vehicle and locate
caliper bleed valve
- loosen valve and attach hose to displace fluid
- second person slowly presses and hold brake pedal
- open valve while pedal is held to release fluid and air
- close valve before letting go of pedal
- fill master cylinder as needed
Brake Master Cylinder - CORRECT ANSWER: - directs hydraulic pressure into the break lines,
pushing brake fluid to each wheel
Braking Internal Process - CORRECT ANSWER: press pedal applying force to the fluid in the
master cylinder, pressure is transferred through break lines to Calipers (Disk) or Wheel Cylinders
(Drum), pushes break pads or shoes against rotor or drum.
, Break Fluid Full Breakdown - CORRECT ANSWER: - clear slightly yellow liquid
- helps create hydraulic pressure needed to operate brakes.
- lubricates the components to reduce wear and prevent corrosion.
- providing a barrier between metal parts inside the braking system and the environment
preventing rust and corrosion.
- absorbs and dissipates the heat generated during braking, prevents system from overheating.
Car Battery - CORRECT ANSWER: - stores electrical energy and provides the power needed to
start the engine and power electrical components.
- works with Alternator to charge itself when the engine is running
Cold Cranking Amps (CCA) Rating - CORRECT ANSWER: indication of how much power the
battery can deliver in cold temps.
Common Brake Issues Breakdown - CORRECT ANSWER: Squeaking - worn break pads,
moisture, dust or debris
Grinding - completely worn pads, damaged rotor
Vibrations (through break pedal) - warped rotors (overheating), uneven break pad wear
Soft Pedal - low break fluid, air in the break lines (bleed break lines to fix)
Pulling to One Side - uneven brake pad wear, stuck/sticky calipers
Brake Fluid Contamination - brown or blackening break fluid
Disc Breaks, Rotor, Break Pads, Caliper, Break Fluid - CORRECT ANSWER: Used in Modern
Vehicles. The break pad presses against the rotor to create friction. The force is transferred
through the rotor to the wheel.
Rotor - flat circular metal disc.
Break Pads - friction materials that press against rotor
Caliper - houses break pads and hydraulics that move pads
Break Fluid - transmits force from break pedal to pads through a closed loop of brake lines
2027 COMPLETE 50 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED
Air Suspension Systems - CORRECT ANSWER: - pressure is used adjust high and firmness of
the ride by regulating air pressure of airbags withing the suspension.
Alternator - CORRECT ANSWER: responsible for charging the battery while the vehicle is
running
Anti-lock Braking System (ABS) - CORRECT ANSWER: prevents wheels from locking up
during emergency braking by continuously monitoring wheel rotation and adjusting break
pressure accordingly
Bleeding the Brakes (Two-man) Breakdown - CORRECT ANSWER: - raise vehicle and locate
caliper bleed valve
- loosen valve and attach hose to displace fluid
- second person slowly presses and hold brake pedal
- open valve while pedal is held to release fluid and air
- close valve before letting go of pedal
- fill master cylinder as needed
Brake Master Cylinder - CORRECT ANSWER: - directs hydraulic pressure into the break lines,
pushing brake fluid to each wheel
Braking Internal Process - CORRECT ANSWER: press pedal applying force to the fluid in the
master cylinder, pressure is transferred through break lines to Calipers (Disk) or Wheel Cylinders
(Drum), pushes break pads or shoes against rotor or drum.
, Break Fluid Full Breakdown - CORRECT ANSWER: - clear slightly yellow liquid
- helps create hydraulic pressure needed to operate brakes.
- lubricates the components to reduce wear and prevent corrosion.
- providing a barrier between metal parts inside the braking system and the environment
preventing rust and corrosion.
- absorbs and dissipates the heat generated during braking, prevents system from overheating.
Car Battery - CORRECT ANSWER: - stores electrical energy and provides the power needed to
start the engine and power electrical components.
- works with Alternator to charge itself when the engine is running
Cold Cranking Amps (CCA) Rating - CORRECT ANSWER: indication of how much power the
battery can deliver in cold temps.
Common Brake Issues Breakdown - CORRECT ANSWER: Squeaking - worn break pads,
moisture, dust or debris
Grinding - completely worn pads, damaged rotor
Vibrations (through break pedal) - warped rotors (overheating), uneven break pad wear
Soft Pedal - low break fluid, air in the break lines (bleed break lines to fix)
Pulling to One Side - uneven brake pad wear, stuck/sticky calipers
Brake Fluid Contamination - brown or blackening break fluid
Disc Breaks, Rotor, Break Pads, Caliper, Break Fluid - CORRECT ANSWER: Used in Modern
Vehicles. The break pad presses against the rotor to create friction. The force is transferred
through the rotor to the wheel.
Rotor - flat circular metal disc.
Break Pads - friction materials that press against rotor
Caliper - houses break pads and hydraulics that move pads
Break Fluid - transmits force from break pedal to pads through a closed loop of brake lines
