Antilock braking systems: Mississippi CDL practice questions
Part of the General Knowledge test. We have 6 checked questions on this topic. Here are the key rules, and two to try.
Key facts
| Part of | the General Knowledge test (80% to pass) | 49 CFR 383.135 |
|---|---|---|
| Manual section | §2.18 Antilock braking systems | MS CDL Manual p. 2-36 |
| Questions in CDL Mile's bank | 6 | CDL Mile, checked against MS CDL Manual |
Key rules
- § 2.18.5p. 2-36
ABS on the tractor alone helps you keep steering control and lowers the chance of a jackknife, but the trailer can still swing out. If it starts to, ease off the brakes when it is safe to do so.
ABS on the Tractor Only or Only on the Trailer
- § 2.18p. 2-36
ABS is an add-on to your normal brakes. Sensors watch for a wheel that is about to lock, and only then does the ECU lower brake pressure. The rest of the time your brakes work normally.
Antilock braking systems
Try two questions
General Knowledge · Antilock braking systems
In an emergency stop, when does the manual say you may apply the brakes fully instead of braking the way you normally would?
Tap an answer to see the explanation and the manual page.
General Knowledge · Antilock braking systems
Which of these problems is ABS designed to help you avoid?
Tap an answer to see the explanation and the manual page.
More General Knowledge topics
Sources
Mississippi Commercial Driver's License Manual, version March 2025, Mississippi Department of Public Safety. Page references are to its printed page numbers. CDL Mile is independent and not affiliated with Mississippi DPS.
Updated for the March 2025 Mississippi CDL manual. Last checked November 5, 2026.
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