Remove/install mechanical stop lamp switch - AR42.10-P-0040MCC

MODEL 451.3/4 

MODEL 450.3/ 4 

Illustrated on model 451 

Fig 1: Identifying Stop Lamp Switch Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

MODIFICATION NOTES

22.9.10

Work procedure completely revised owing to new self-adjusting brake light switch (S9/1)

Operation steps 1 to 12

	Remove
1	Remove brake pedal module cover	The brake pedal module cover removed is no longer fitted
		Type 450	AR29.10-P-0330SM
		Model 451	AR29.10-P-0330MCC
2	Disconnect electrical connector (3) on brake light switch (S9/1)
3	Turn brake light switch (S9/1) 90° counterclockwise and remove from bracket (2)
	Checking
4	Check that punch holes are present in boot on brake pedal (1); make punch holes if necessary and install boot	Only on model 450 If the boot of the brake pedal (1) is not already punched, the boot must be punched and an additional pedal assembly seal must be retrofitted. The new brake pedal module cover will be installed at a later stage.
		Left-hand drive vehicles	AR29.10-P-0340SM
		Right-hand drive vehicles	AR29.10-P-0340SN
5	Check whether catch hooks of pedal assembly seal are all engaged correctly	Engage the catch hooks of the pedal assembly seal if necessary.
	Install
6	Insert brake light switch (S9/1) into bracket (2) and turn 90° clockwise as far as end stop	Before installing the new self-adjusting brake light switch (S9/1), make sure that the plunger is pulled out fully.
7	Contact electrical connector (3) on brake light switch (S9/1)
8	Install brake pedal module cover	Use the new brake pedal module cover.
		Type 450	AR29.10-P-0330SM
		Model 451	AR29.10-P-0330MCC
	Adjust
9	Pull brake pedal (1) back firmly in direction of arrow (arrow A)	Automatic adjustment of the brake light switch (S9/1) when pulling back the brake pedal (1) is clearly audible.
	Checking
10	Connect STAR DIAGNOSIS and delete fault memory	Type 450	AD00.00-P-2000-04SM
		Model 451	AD00.00-P-2000-04MCC
11	Check brake light switch signal using Star Diagnosis
12	Close Star Diagnosis	Type 450	AD00.00-P-2000-04SM
		Model 451	AD00.00-P-2000-04MCC