cam anyone tell me if the a4 electronic rear brake pressure regulation is anything like the bmw corner braking system.if it is i wonder why audi does not sell it as hard as bmw.

Not familiar with the BMW corner braking system, but from your description it acts something like the 'Vetter system of applying braking to one rear wheel during cornering to minimize oversteer potential. No, Audi system isn't like this; as fart a I know, it's for low traction, low grip situations.<br>