Remove/install pedal assembly - AR29.10-P-0300MCU

MODEL 451.3/4 

Fig 1: Identifying Pedal Assembly Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of poisoning  caused by swallowing brake fluid. Risk of injury  caused by brake fluid coming into contact with skin and eyes.	Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
1	Push down brake pedal several times	To reduce any vacuum.
2	Remove maintenance flap
3	Unscrew cap of brake fluid expansion reservoir and drain brake fluid
4	Remove bellows at brake pedal		AR29.10-P-0340MCC
5	Remove diagonal struts	On model 451.4	AR61.10-P-5138MCU
6	Remove mechanical stop lamp switch		AR42.10-P-0040MCC
7	Remove grommet (2) with electrical line (3) from pedal assembly (1)	Pay attention to the correct seat of the grommet (2) otherwise damage can occur due to water entry.
8	Unhook electrical line (3) from brackets (4)
9	Unhook bracket (5) of wiring harness (7)
10	Unclip retaining clip (6) of wiring harness (7)
11	Pull vacuum line of brake booster (9) out of brake booster (8)	: Check the grommet of the brake booster vacuum line (9) in the brake booster (8), replace if necessary.
12	Remove retainer (10) and carefully press out expansion reservoir connecting line (11) at master brake cylinder (12) using a suitable tool	Collect brake fluid in a suitable container. Seal the connections using suitable plugs. : Check seals of expansion reservoir connecting line (11) in master brake cylinder (12), replace if necessary. Use pliers for installation.	Fig 2
13	Unhook electrical line (13) at brake line (14)
14	Check bolted connections of brake lines (14, 15) with the master brake cylinder (12) for color coding	: Identify brake lines (14, 15) accordingly.	AR42.10-P-0013-05MCC
15	Loosen bolted connections of the brake lines (14, 15) with the brake hose (12) and separate	Collect brake fluid in a suitable container. Seal the connections using suitable plugs.	*BA42.10-P-1005-04E
		: Use a 12 mm open-end wrench bit. Do not bend brake lines (14, 15), pay attention to routing, leaktightness and clearance. If a brake line (14, 15) with a red color coding has been released, this brake line (14, 15) must be replaced. Refer to: ↓ Remove/install brake line from the master brake cylinder to the ESP hydraulic unit	AR42.10-P-0034MCU
16	Unscrew bolts (16, 17)		*BA29.10-P-1001-02C
			*BA29.10-P-1006-02C
17	Remove pedal assembly (1) with brake booster (8) and master brake cylinder (12)	Pedal assembly (1), brake booster (8) and master brake cylinder (12) are supplied as one replacement part.
18	Install in the reverse order
19	Bleed brake system		AR42.10-P-0010MCU

PEDALS, BEARING BRACKET

Number	Designation		Model 451.3/4
BA29.10-P-1001-02C	Bolt, brake pedal module to body	Nm	25
BA29.10-P-1006-02C	Bolt, connection piece between brake pedal module and brake booster to body	Nm	27

BRAKE LINES, BRAKE HOSES

Number	Designation		Model 451.3/4
BA42.10-P-1005-04E	Brake pipe to master brake cylinder	Nm	16

Fig 2: Identifying Pliers (450 589 15 37 00)

Courtesy of MERCEDES-BENZ USA