Brake System Operation Quiz

Questions and Answers

What happens when the brake pedal is pressed?

The air reservoir releases all pressure into the braking system.

The brake con valve opens, allowing air to press against the power piston. (correct)

The power piston moves backward, allowing fluid to exit the master cylinder.

The brake shoes return to their original position immediately.

Which component returns the brake pedal to its original position after being released?

Op rod

Power piston

Pedal returning spring (correct)

Brake shoes

What is the result of the power piston pressing against the master cylinder piston?

The brake shoes move outward. (correct)

The stop light sending unit is deactivated.

The fluid is returned to the reservoir.

The brake con valve is closed immediately.

What occurs after the brake con valve closes?

<p>Fluid from the master cylinder is forced into the reservoir.</p> Signup and view all the answers

When does the air behind the power piston escape through the air con valve?

<p>During the brake 'off' action after the pedal is released.</p> Signup and view all the answers

Study Notes

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.

Description

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.