Friction brake pedal assembly/parking brake, function - GF42.20-P-1000A

WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.

MODEL 129, 140, 163, 202, 208, 209, 210, 211, 215, 220, 240

MODEL 203, 230 up to Model Year 08/modification year

Fig 1: Identifying Pedal Assembly Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

To hold the brake pedal (75) of the parking brake in the pressed position and avoid loose knock.

Function

A brake drum (1) is cast into the brake pedal (75). A pre-compressed flat spiral spring (2) is wound around this drum (1).
The flat spiral spring is pre-compressed by a spring (6).
If the brake pedal (75) is pressed, the force of friction of the flat spiral spring (2) continuously holds the brake pedal (75). When the pedal is pressed the familiar adjusting noise is passed on via the toothing (3) and the notch (4).