Some answers not in order:
Crossover hydro gear brake system: less unsprung weight(no brakes required on rear axles and the weight is centrally located for better balance)
They are more effective because the braking is done on the gear shaft itself.
Removing brake issues like sticking, no lines to run, uneven wear - (warped discs),fluid loss and loss of stopping power from debris,less maintanace, etc
The new FG cars come with hydro cross gear brakes.
You can get a mechatech kit that retrofits the hydro cross gear brake to most FG vehicles + other makes also.
One reason for single systems usually - by racers, convience ie: faster filling/topping off during a race and some use it to control f/r balance with a proportioning valve.
But... If the servo or brake fails,you have 0 brakes.
With dual brakes if one fails,you still have the the other braking system.
Front and cross hydro gear in the rear are the way to go.
In the end ,It's a matter of personal choice, which system you choose.
I'm running front and rear now but thinking of next build using hydro gear brake setup.
