Important: After replacing the brake pad friction linings, you should press the brake pedal firmly several times with the vehicle stationary to ensure that the friction linings are in their working position. Before you begin removing the disc brake caliper or disconnecting the brake hose from the brake caliper, you must secure the brake pedal with a device (spacer bar) to hold the brake pedal. Brake fluid that has already been used cannot be reused. Tightening torque of wheel mounting bolts: 120 Nm.
Assembly diagram of the front wheel brake mechanism C54-II
1 - Brake disc, without maximum axial runout marking, thickness: 25 mm, wear limit: 22 mm, replace on both sides of the axle in principle; 2 - Screw, 4 Nm; 3 - Brake disc, with a mark approx. wide. 5 mm to indicate the maximum axial runout, with 5 holes for mounting the wheel hub, thickness: 25 mm, wear limit: 22 mm, replace on both sides of the axle in principle; 4 - Sheet steel retaining piece for holding friction linings; 5 - Friction linings (segments), with wear indication, when wear is appropriate (border: 2...3 mm) the indicator light on the instrument panel is on, thickness: 18.6 mm (incl. support plate), wear limit: 2.0 mm without support plate, replace on both sides in principle; 6 - Brake caliper (brake mechanism shield); 7 - Corrugated cover (cuff); 8 - Guide pin; 9 - Heat-protective casing; 10 - Disc wheel brake support; 11 - Screw, 30 Nm, replace after each extraction; 12 - Elastic bushing; 13 - Brake hose with nipple, hollow screw and sealing rings, do not disassemble, replace only one piece, as a set, tightening torque: 35 Nm; 14 - Screw, 124 Nm; 15 - Hexagon socket head cap screw, 8 Nm, for ABS speed sensor; 16 - ABS Speed Sensor; 17 - Wheel hub bearing cap; 18 - Protective sheet; 19 - Screw, 10 Nm; 20 - Wheel hub with wheel hub bearing, with and without maximum axial runout marking
Removal
Install the brake pedal holding device. Unscrew the brake hose from the disc brake caliper. Unscrew the disc brake caliper from the caliper support.
Installation
Screw the disc brake caliper onto the caliper support.
Screw the brake hose onto the disc brake caliper. Remove the brake pedal holding device. Bleed the brake system.
