I have 06 Honda CRV and have used Ready Brake (surge brakes) system for ten tears with out any problems, considering your question about the brakes applying on the toad when going down the hill "yes" it does and it is design this way, the toad will have the tendency to free wheel forward due to momentum between vehicles going down the hill, as it moves forward it would have the tendency to apply its own brakes which in turn will hold back and separate it self causing no problems and will resume normal breaking operations.