Brake problem

[Damoore1983]

Hi when i'm driving and hit the brakes all seems ok, but if i hit a patch of rough ground or brake a little too quickly, i get a lot of vibration on the brake pedal also hear a loud grinding noise/ or somtimes a noise that can only be discribed as a coiled spring being released.

any ideas

thanks

[lofty]

If you hit the brakes hard and keep the pressure on you should hear a gunning sound, this is the ABS (Active Braking System) coming in and preventing the brakes locking the wheels,
If you know anything about cadence braking, that’s what you do, press release press release until the car stops.
MB designed this system that is now fitted on a lot of cars and it does the job for you BUT only if you press the brake pedal hard and keep the pressure on. proved to stop the car quicker and without locking the wheels even on wet surfaces
I strongly suspect that is what you heard.

Not sure how you spell Cadence what I can tell you is its difficult to do releasing the brakes and reapplying several times when your approaching the rear of another vehicle takes a bit of doing until you have confidence in the method with the 'A' Class and some other cars it's done for you. The esp also kicks in and keeps the car straight all clever stuff.