🛞Arizona Air Brakes — Question 4 of 10
The most common type of foundation brake found on heavy vehicles is the:
Answer: B
S-cam drum.
S-cam drums are the most common brake design used on foundation brakes for commercial vehicles. There will be one drum per wheel and operated by using an air-activated push rod to rotate an S-shaped cam to move the shoes into contact with the drums.
Source: Arizona CDL Manual
All choices
- AWedge drum.
- BS-cam drum.
- CDisc.
Arizona CDL Air Brakes Test Info
Questions on Exam
25
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
Age Requirements
Intrastate: 18+ · Interstate: 21+
Arizona MVD
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More CDL Air Brakes Practice Questions
- To check the free play of manual slack adjusters of S-cam brakes, you should park on:
- A slack adjuster free play needs to be adjusted if it is more than about ____ when you pull hard on it.
- Stab braking:
- Which procedure is used in controlled braking?
- Which braking technique may be used to stop quickly when you do not have ABS?