Too many Kubotas
Veteran Member
I think we agree on that for every action there's an opposite and equal reaction.Oh! Since all of our trailers in PA have brakes on all axles, I have never actually seen one set up with brakes on only one axle. Surprising to me it's on the rear, thinking that most vehicles transfer their weight onto the front axle when stopping, but I guess this is a unique peculiarity of dual leaf spring setups?
But then it seems it'd be even worse for the break-away scenario, since most trailers are tongue-heavy and lighter in the rear, when properly loaded. If only the rear axle has the brakes, seems it could just be locking up the rear tires without much hope of actually stopping a run-away trailer if it comes un-hooked on the highway.
So when applying the (only) brakes on the rear axle of a leaf sprung trailer it makes the axle itself want to rotate "forward". Since the balance beam allows more axle rotation than a fixed single axle spring does it effectively lowers the rear axle and raises the front one. More weight on the braked axle is a good thing.
The same thing happens with the brakes on the front axle, except now the front axle lifts itself up and puts more weight on the brakeless rear axle. Not good.
Of course, if having goofed up enough to put the break-away to use, then the front of the trailer would become much lower and a braked front axle could be beneficial.
Aside from insisting on all axles having brakes, I would prioritize normal driving/braking performance over what happens if something comes apart in the tow vehicle to trailer connection.