Brake Failure

[da SLUG man]

I was talking with one of the guys that carries out the SVA test. He said there is a load sensing valve that makes sure the front brakes come on slightly before the rears. This valve is prone to seizure and can adversly effect the braking prefomance. If it has seized halfway open it can bring the rear brakes in first and thats when the vehicle could become unstable.

it actually increases the braking on the back when carrying a load, and decreases when not carrying a load.... (just a bias valve that is moved by the action of the rear of the vehicle rising and falling as it's loaded)
saggy arse drivers probably get trouble with the back brakes locking in the wet?