Gross trailer weight
The Act uses gross weight. For a trip-specific decision, actual loaded trailer weight is more useful than dry weight.
ONTARIO · TRAILER BRAKES
When does a trailer need brakes in Ontario?
Ontario's Highway Traffic Act requires every trailer or semi-trailer with a gross weight of 1,360 kg or more—about 3,000 lb—to have brakes adequate to stop and hold the vehicle.
HOW TO APPLY IT
Use loaded trailer weight, not a brochure shortcut
Trailer cargo, fluids and installed equipment can move a trailer across the legal brake threshold.
Legal minimum ≠ towing maximum
Having legally required brakes does not increase the tow vehicle's GCWR, trailer rating, payload or hitch rating.
Controller compatibility
Where electric trailer brakes are used, controller type, vehicle wiring and proper setup remain separate equipment questions.
Brake controller guideThis page summarizes official Ontario sources reviewed August 23, 2026. It is informational, not legal advice. The current Act and MTO guidance remain authoritative.
OFFICIAL SOURCES
Check Ontario's wording directly
Highway Traffic Act s.64(5)
Every trailer or semi-trailer at 1,360 kg gross weight or more must have brakes adequate to stop and hold the vehicle.
MTO handbook
The driver's handbook repeats the 1,360 kg gross-trailer-weight brake requirement in plain language.
Vehicle + equipment limits
Then verify the applicable vehicle towing ratings and the ratings and instructions for the installed towing equipment.
TOWGAUGE
Now check the vehicle side.
Use TowGauge's source-backed Canadian vehicle configurations to check the trailer rating, then add vehicle-specific payload or scale data when you want deeper checks.
Official sources: Ontario Highway Traffic Act · Ontario MTO towing handbook.