Brakes on the vehicle while on a dolly would be very dangerous since if the car brakes applied harder than the dolly it could pull the car loose which would create a real mess!
I agree but here is the info
Independent braking system is required in each weight bearing wheel where gross weight exceeds 1,300 kg (2,867 Ibs). Breakaway brakes are required on all trailers 1,360 kg (3,000 Ibs) and over."
I can only hope there is a translation problem. I sent email to Quebec asking for clarification.