Carrying out bleeding operation - AR42.10-P-0010-02CW

MODEL 204

FRONT AXLE BRAKE CALIPER

Number	Designation		Model 204 except model 204.077/277/377/9	Model 204.077/277/377	Model 204.9
BA42.10-P-1003-10J	Bleed screw to brake caliper	Nm	14	14	14

REAR AXLE BRAKE CALIPER

Number	Designation		Model 204 except model 204.077/277/377	Model 204.077/277/377
BA42.10-P-1002-12J	Bleed screw to brake caliper	Nm	14	17

CLUTCH OPERATING MECHANISM

Number	Designation		Model 204 with transmission 716.6	Model 204 with Transmission 711.6
BA25.20-P-1001-01B	Bleed screw to central clutch operator	Nm	9	9

Fig 1: Identifying Bleed Bottle And Cover

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Opening Sequence For 6-Piston Brake Calipers On Front Axle

Courtesy of MERCEDES-BENZ USA

Adjust bleeding pressure at brake fluid changing unit to 2.0 bar.
Remove dust caps of bleed screws (1, 2, 3, 4, 5, 6) on the brake calipers.
Connect bleed hose of bleed bottle (01) to bleed screw (1) of brake caliper.
Open bleed screw (1) on brake caliper.
(5.1) Bleeding the hydraulic system of the brake system:
(after this was opened for repair purposes) Depress the brake pedal repeatedly until fresh brake fluid flows out free of bubbles at the bleed screw (1) of the brake caliper.

To bleed the brake system correctly it is essential to pump the brake pedal throughout the entire bleeding process! Otherwise malfunctions and failure of the brake system can occur due to the remaining residual air!

In order to avoid the intake of air, do not pump the brake pedal in a jerking manner, but gradually release.

The bleed screw (1) at the brake caliper can remain open during the entire pumping procedure.

NOTE: Required total volume of brake fluid: approx. 1.5 liter

(5.2) Replacing the brake fluid of the brake system: (Hydraulic system of the brake system was not opened previously for repair purposes)

Keep the bleed screw (1) at the brake caliper open until fresh brake fluid flows out.

It is not necessary to pump the brake pedal!

NOTE: Total quantity of brake fluid required: approx. 0.75 liters.
Close bleed screw (1) at brake caliper.
Repeat process at bleed screw (2, 3, 4, 5, 6) of brake calipers.
The numbering of the bleed screws (1, 2, 3, 4, 5, 6) shows the opening sequence.
Disconnect bleed hose of bleed bottle (01) from bleed screw (1) of brake caliper.
Vehicle with manual transmission:
Remove the cover (7) from the bell housing and repeat bleeding process at the bleed screw of the central clutch operator.
Attach dust caps of bleed screws (1, 2, 3, 4, 5, 6) to brake calipers and cover (7).