Remove, install brake line from stepped tandem brake master cylinder to hydraulic unit - AR42.50-P-0002RT

MODEL 251 

Fig 1: Identifying Brake Line From Stepped Tandem Brake Master Cylinder To Hydraulic Unit Remove/Install Components

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Brake Line From Stepped Tandem Brake Master Cylinder To Hydraulic Unit Remove/Install Components - Shown On Engine 113.971

Courtesy of MERCEDES-BENZ USA

Shown on engine 113.971 

	Remove/install
	Risk of poisoning  caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.	Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Brake fluid notes	All models	AH42.50-P-0001-01A
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02RT
	Notes on repairs to brake system	All models	AH42.00-P-0003-01A
1	Open engine hood and raise to vertical position		AR88.40-P-1000RT
2	Unscrew union nut of pressure circuit brake line (4) and unscrew union nut of secondary brake circuit brake line (5)	Risk of confusion!  Before unscrewing, mark the brake line in relation to the appropriate connection. Seal connections with stop plugs in order to prevent brake fluid running out.
		Collect any brake fluid which runs out in a fluff-free, absorbent cloth. Seal brake lines and line connections on the ESP hydraulic unit (3) immediately with plugs, in order to prevent the ingress of foreign bodies.	*BA42.10-P-1003-14A
		Box wrench bit	Figure
		Set of stop plugs	Figure
3	Remove the partition wall between the wheelhouses		AR62.30-P-2400RT
4	Remove screws (6)
5	Remove bracket (7)
6	Remove injection system control unit	Only with engine 156, 642.
7	Unscrew nuts (8)	Only on engine 113 and engine 642.
8	Unclip electrical connector (9)	Only on engine 113, 156 and engine 642. On engine 642 two electrical connectors are attached to the bracket (7) which both have to be unclipped. Do not disconnect electrically
9	Place bracket (10) upwards out of the working area	Only on engine 113, 156 and engine 642.
10	Unscrew union nut of pressure circuit brake line (11) and union nut of secondary brake circuit brake line (12)	Risk of confusion!  Before unscrewing, mark the brake line in relation to the appropriate connection. Seal connections with stop plugs in order to prevent brake fluid running out.
		Collect any brake fluid which runs out in a fluff-free, absorbent cloth. Seal brake lines and line connections on the ESP hydraulic unit (3) immediately with plugs, in order to prevent the ingress of foreign bodies.	*BA42.45-P-1002-01K
		Box wrench bit	Figure
		Set of stop plugs	Figure
11	Unclip brake line of pressure circuit (1) and brake line of secondary brake circuit (2) from clips (13)
12	Remove pressure circuit brake line (1) and secondary brake circuit brake line (2)
13	Install in the reverse order
14	Bleed brake system		AR42.10-P-0010RT

BRAKE HOSES, BRAKE LINES

Number	Designation		Model 251
BA42.10-P-1003-14A	Brake pipe to master brake cylinder	Nm	18

ELECTRONIC STABILITY PROGRAM (ESP)

Number	Designation		Model 251
BA42.45-P-1002-01K	Union nut, brake line to ESP hydraulic unit	Nm	18

Fig 3: Identifying Box Wrench Bit (140 589 00 03 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Set Of Stop Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA