Brake System Operation Quiz

Brake "On" Action

• Pressing the brake pedal initiates movement of the arm and operating rod forward.
• The brake control valve activates, allowing air pressure to build until the air reservoir is adequately filled.
• Air flows behind the power piston, pushing it forward and closing the return spring.
• The operating rod of the power piston triggers the master cylinder piston, closing the return spring and activating the stop light sending unit.
• Pressurized fluid in front of the master cylinder piston is forced out to both front and rear wheel cylinders, exerting pressure on their pistons.
• Brake shoes extend outward, adhering to the wheel and drum, leading to the wheel's stoppage and consequently halting the vehicle.

Brake "Off" Action

• Releasing the brake pedal allows the returning spring to exert tension, pulling the pedal back to its original position.
• The operating rod moves backward, closing the brake control valve and allowing the returning spring to reposition the brake shoes.
• The piston in the wheel cylinder retracts, facilitating the flow of brake fluid from the master cylinder back to the fluid reservoir.
• The power piston returns to tension, and air behind it is released through the air control valve.

This quiz explores the detailed actions involved when the brake pedal is pressed in a brake system. It covers the mechanics of air pressure application, valve operation, and the functionality of the power piston and master cylinder. Test your understanding of these critical components in braking systems.