Adjust parking brake - AR42.20-P-0540RT

MODEL 251 

Fig 1: Adjusting Parking Brake

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

1.9.10

"Perform brake test on test bench" reference changed

Test sequence augmented/revised

	Removing
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
	Notes on repairs to brake system	All models	AH42.00-P-0003-01A
1	Release parking brake
2	Lift/jack up vehicle		AR00.60-P-1000RT
3	Remove rear wheels		AP40.10-P-4050RT
	Adjust
4	Remove rubber insert (2)
5	Bring brake shoes (4) into contact with parking brake drum	Turn the adjusting wheel (3) by means of a screw driver until the brake shoes (4) contact the brake drum and the brake disk (1) cannot be turned by hand anymore. Positioning direction for applying the brake shoes (4): Turn both adjustment wheels from above downwards.
6	Detach adjustment wheel (3)	Loosen left and right adjustment wheel by the same number of teeth. It must be possible to rotate the rear wheel or brake disk (1) completely freely by hand.
	Checking
7	Operate the parking brake lever several times and check the travel of the parking brake lever	Number of notches at which the parking brake must be adjusted if up to that point there is insufficient braking effect	*BE42.20-P-1001-01H
8	Release parking brake and check unobstructed movement of rear wheels or brake disks
	Install
9	Fit rear wheels		AP40.10-P-4050RT
	Risk of death  caused by limbs being caught  or crushed  by rotating parts when performing tests on the brake test stand	Never leave the vehicle unattended on the rollers except in an emergency. Ensure that no one is under the vehicle or near rotating parts during testing. In case of emergency, use the EMERGENCY STOP switch to shut down test stand.	AS42.00-Z-0001-01A
10	Carry out brake test on the test stand		AP42.00-P-4290BA

ADJUSTMENT VALUES FOR PARKING BRAKE

Number	Designation	Model 251
BE42.20-P-1001-01H	Number of notches at which the parking brake must be adjusted if up to that point there is insufficient braking effect	7