System PartsQuestion 14 of 60
What is the function of the brake chamber and pushrod?
a.To store reserve air for the trailer
b.To cool the brake drums during long stops
c.To warn the driver of low air pressure
d.To convert air pressure into mechanical force that turns the slack adjuster
Explanation
When you brake, air enters the brake chamber and pushes the pushrod outward. The pushrod moves the slack adjuster, which rotates the S-cam and applies the brakes. This converts the air pressure into the mechanical force that presses the shoes against the drum.
Practice all 60 questions free — no signup required.
Related questions on this topic
- What is the purpose of the supply pressure gauge in the cab?
- What does the application pressure gauge show?
- What does the brake pedal (foot valve) do in an air brake system?
- What is the purpose of the slack adjuster?
- What controls the parking brakes on a vehicle with air brakes?
- Why should you NOT use the parking brakes if the brakes are very hot, such as after coming down a steep hill?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against CDL Air Brakes Knowledge Test · How we review