mercedes 190e "h" reg

[Ddraper]

When I depress the brake pedal the car slows down however the there is a knocking sound, the car shudders and the brake pedal pushes back and then doesn't rapidly under my foot? Does anyone know what this could be?

 

[jberks]

abs?
Alternatively, something is out of line, pushing the piston back in the caliper. Could also be the brake servo I would imagine if its a bit late keeping up with the sudden extra power requirements.
Get it checked, most qwicki fit types will diagnose it for you (it could fail the MOT anyway) and then you can decide whether to fix it yourself or let them do it.

 

[MondeoMan]

Warped brake disk(s)?

 

[classicsl]

i had this problem on my sl, 2 new abs sensors at front at £140 fitted cured the problem

 

[nicky]

has the car got ABS fitted,if not you have a warped disc...

 

[tom7035]

Yes, definitely warped disc/s.