CDL School Bus (S) Endorsement Test
Antilock brakes: practice questions
Our CDL School Bus bank has 12 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
Your ABS malfunctions. What do you still have?
- Only engine braking
- Only the parking brake
- No brakes at all; you must stop at once
- Normal brakes; have the ABS fixed soon
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D. Normal brakes; have the ABS fixed soon — If your ABS malfunctions, you still have regular brakes. Drive normally, but get the system serviced soon (CDL Manual 10.6.4)
Question 2
How can you tell your school bus has ABS?
- A sticker on the door
- A yellow ABS malfunction lamp on the instrument panel
- A red light on the roof
- A green light on the left outside mirror
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B. A yellow ABS malfunction lamp on the instrument panel — Your school bus will have a yellow ABS malfunction lamp on the instrument panel if it is equipped with ABS (CDL Manual 10.6.1)
Question 3
Hydraulically braked buses built on or after which date must have ABS?
- July 1, 1995
- January 1, 2001
- March 1, 1998
- March 1, 1999
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D. March 1, 1999 — Hydraulically braked trucks and buses built on or after March 1, 1999 (CDL Manual 10.6.1; 49 CFR 393.55(a))
Question 4
Air-braked buses built on or after which date must have ABS?
- October 1, 2005
- January 1, 1990
- March 1, 1998
- March 1, 1999
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C. March 1, 1998 — Air brake vehicles (trucks, buses, trailers and converter dollies) built on or after March 1, 1998 (CDL Manual 10.6.1; 49 CFR 393.55(c))
Question 5
On newer buses, what should the ABS lamp do at start-up?
- Never come on
- Stay on the whole trip
- Light for a bulb check, then go out
- Flash until you reach 30 mph on the road
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C. Light for a bulb check, then go out — As a system check on newer vehicles, the malfunction lamp comes on at start-up for a bulb check and then goes out quickly (CDL Manual 10.6.4)