Remove/install brake booster vacuum line - AR43.10-P-0355MEV

MODEL 451.391/491 

Fig 1: Identifying Brake Booster Vacuum Line Remove/Install Components - Model 451.391/491 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Brake Booster Vacuum Line Remove/Install Components - Model 451.391/491 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Risk of death  when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who wear electronic implants (e.g. cardiac pacemakers), must not  carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
	Note on high-voltage battery		AH54.10-P-0006-01MEV
	Note on the voltage on-board electrical system		AH54.00-P-0010-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Push down brake pedal several times	To reduce any vacuum.
2	Remove high-voltage battery	When removing the brake booster vacuum line at front (1.1).	AR54.10-P-1140MEV
3	Pull brake booster vacuum line at front (1.1) out of brake booster (3)	When removing the brake booster vacuum line at front (1.1). The brake booster vacuum line at front (1.1) and brake booster vacuum line at rear (1.2) can be removed separately and replaced if necessary. : Check seal on brake booster (3) for damage and replace if necessary.
4	Unclip front brake booster vacuum line (1.1) from brackets (2, 4)	When removing the brake booster vacuum line at front (1.1). : Check bracket (2, 4) for damage, replace if necessary.
5	Disconnect pneumatic clutch (1.3) between the brake booster vacuum line at front (1.1) and brake booster vacuum line at rear (1.2)	The pneumatic clutch (1.3) is located above the frame-type integral support (6).
6	Unclip brake booster vacuum line at front (1.1) from bracket (5) and remove	When removing the brake booster vacuum line at front (1.1). : Check bracket (5) for damage, replace if necessary.
7	Operate both catch hooks of pneumatic clutch (1.4) simultaneously in the arrow direction and detach brake booster vacuum line at rear (1.2) at brake booster vacuum pump (M57)	When removing the brake booster vacuum line at rear (1.2). : Make sure that the pneumatic coupling (1.4) is seated correctly on the brake booster vacuum pump (M57).
8	Detach brake booster vacuum line at rear (1.2) at brake booster vacuum pump control unit (N65/3)	When removing the brake booster vacuum line at rear (1.2).	AR43.05-P-1323MEV
9	Expose brake booster vacuum line at rear (1.2) at body	When removing the brake booster vacuum line at rear (1.2). The brake booster vacuum line at rear (1.2) is fasted to the body with a cable tie.
10	Pull out the brake booster vacuum line at rear (1.2) forwards between the frame-type integral support (6) und body and remove	When removing the brake booster vacuum line at rear (1.2).
11	Install in the reverse order
12	Carry out brake test on the test stand
			AP42.00-P-4290MCC