During inspection, which item is checked for piston travel?

During inspection, which item is checked for piston travel?

• A. Piston travel
• B. Wipers
• C. Lantern
• D. Brake pipe pressure

Answer: (A)

The test is about measuring how far the brake actuator’s piston moves inside the brake cylinder during braking. This distance, called piston travel, is checked in inspection because it directly shows whether the brake mechanism has enough movement to fully apply and then release the brakes. If the piston travel is too little, the brakes may not clamp properly; if it’s too much, there could be leaks, worn seals, or other wear that allows excessive movement and reduces braking efficiency. The other items listed aren’t related to piston movement in a brake cylinder: windshield wipers serve visibility, a lantern is a signaling device, and brake pipe pressure concerns the air supply rather than the physical displacement of the piston. So verifying piston travel is the correct focus.

The test is about measuring how far the brake actuator’s piston moves inside the brake cylinder during braking. This distance, called piston travel, is checked in inspection because it directly shows whether the brake mechanism has enough movement to fully apply and then release the brakes. If the piston travel is too little, the brakes may not clamp properly; if it’s too much, there could be leaks, worn seals, or other wear that allows excessive movement and reduces braking efficiency. The other items listed aren’t related to piston movement in a brake cylinder: windshield wipers serve visibility, a lantern is a signaling device, and brake pipe pressure concerns the air supply rather than the physical displacement of the piston. So verifying piston travel is the correct focus.