Air Brake Adjustment: ICBC Class 4 Practice Questions
Get comfortable with Air Brake Adjustment before test day. Same style of questions ICBC actually asks, an instant score, and a clear look at where you need more practice.
Practise Air Brake Adjustment
One question at a time, just on this topic. Once you're done, you'll get your score and a full breakdown of every answer. 80% is a pass, and there are 15 questions in the bank to draw from.
Practise Air Brake Adjustment NowSample questions
A taste of what's in this category, with the answer and why. Hit practise above for the full set.
Why is correct air-brake adjustment so important?
- Out-of-adjustment brakes reduce braking power and lengthen stopping distance
- B It improves fuel economy only
- C It makes the brakes quieter
- D It has no real effect
Why: When brakes are out of adjustment, less force reaches the foundation brakes, reducing braking power and increasing stopping distance.
The most common air-brake defect found during inspections is:
- A Worn brake pedals
- Brakes out of adjustment
- C A faulty horn
- D A cracked windshield
Why: Brakes out of adjustment are the most common air-brake defect found in roadside inspections, which is why checking adjustment matters.
What does a slack adjuster do?
- A Stores compressed air
- B Controls the compressor
- C Cools the brake drum
- Connects the brake chamber pushrod to the brake and sets pushrod travel
Why: The slack adjuster links the pushrod to the foundation brake and is used to keep pushrod travel within limits as the linings wear.
"Applied pushrod stroke" being too long indicates:
- A The brake is well adjusted
- B The air pressure is too high
- The brake may be out of adjustment
- D The tires are under-inflated
Why: Excessive pushrod travel (applied stroke) is a sign the brake is out of adjustment and may not deliver full braking force.
An automatic slack adjuster is designed to:
- Maintain proper brake adjustment automatically as linings wear
- B Never need any inspection
- C Replace the brake chamber
- D Increase air pressure
Why: Automatic slack adjusters self-adjust to keep pushrod travel within limits as linings wear, but they still must be inspected for proper function.
If a vehicle has automatic slack adjusters, you should:
- A Manually adjust them at every stop
- Still inspect them; manual readjusting can hide an underlying fault
- C Remove them
- D Ignore the brakes entirely
Why: Automatic slack adjusters should be inspected, not routinely hand-adjusted; manually adjusting them can mask a problem that needs repair.