Trailer antilock brakes (ABS)
Section 6.3 of the Florida CDL Manual (p. 6-7) covers trailer antilock brakes and their warning lamp. It is tested on the Combination Vehicles test.
Key facts
| Part of | the Combination Vehicles test (80% to pass) | 49 CFR 383.135 |
|---|---|---|
| Manual section | §6.3 Trailer antilock brakes | FL CDL Manual p. 6-7 |
| Questions in CDL Mile's bank | 4 | CDL Mile, checked against FL CDL Manual |
Key rules
- § 6.3.2p. 6-7
ABS is an extra on top of the normal brakes, so if it fails your regular brakes still work. Keep driving normally, but have the ABS serviced soon.
Braking with ABS
Try two questions
Combination Vehicles · Trailer antilock brakes
In normal driving, how does the manual tell you to brake a tractor-trailer that has ABS?
Tap an answer to see the explanation and the manual page.
Combination Vehicles · Trailer antilock brakes
How does ABS change your braking, according to the manual?
Tap an answer to see the explanation and the manual page.
More Combination Vehicles topics
Sources
Florida Commercial Driver's License Manual, version July 2022, Florida Department of Highway Safety and Motor Vehicles. Page references are to its printed page numbers. CDL Mile is independent and not affiliated with the FLHSMV.
Updated for the July 2022 Florida CDL manual. Last checked November 5, 2026.
See where you stand on all three Florida tests.
A free 15-question check, then practice that targets your weak spots. $49 for 60 days if it helps.
Get my free score →