If you feel your brakes in the ON position after passing through a waterway, check the breakaway switch.
This switch can become waterlogged resulting in a short circuit within this switch. As a result of the short circuit, the electric brakes are engaged.
The solution is to pill the pin, wipe clean and re-insert. If the breakaway switch is still causing your brakes to engage, cut the cable and head to your nearest repair shop. The breakaway switch needs replacing.