Test brake system with pressure tester for leaks - AR42.10-P-0015V

MODEL 171.442 /454 /456 /473 

Fig 1: Identifying Pressure Tester And Brake Pedal Winch

Courtesy of MERCEDES-BENZ USA

	Checking
	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.	-
	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.	-
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02V
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
1.1	Deactivate easy entry/exit for driver seat	On vehicles with memory package (driver seat, steering column, mirrors), code 275 When the easy entry/exit is activated the driver seat or steering wheel move into a different position when the driver door is opened or closed. The driver seat may be damaged in the process when the brake pedal jack (080) is installed .	AR54.30-P-1000-02EDV
2	Hoist vehicle with lifting platform until wheels are free		AR00.60-P-1000V
3	Unscrew bleeder screw at brake caliper and connect to pressure tester (051)	Only use pressure testers for brake systems. Pressure testers for hydraulic oil system must not be used for systems with brake fluid, otherwise the brake fluid is mixed with hydraulic fluid. This results in failure of the brake system After the leak test, only bleed the brake caliper to which the pressure tester (051) was connected.
		Bleed screw on front axle floating caliper	*BA42.10-P-1002-10P
		Bleed screw on rear axle fixed caliper Pressure tester	*BA42.10-P-1002-12P
4	Bleed pressure tester (051).
	High-pressure check
5	Allow the engine to run at moderate speed and release the accelerator pedal suddenly	This produces the highest possible vacuum.
6	Mount the brake pedal jack (080) with adapter for brake pedal jack between the driver seat and brake pedal	Protect the brake pedal and driver seat from damage.
		Brake pedal winch	Fig 2
		Adapter for brake pedal winch	Fig 3
7	Depress brake pedal as far as possible with the brake pedal winch (080)
8	Check pressure drop	The pressure may drop by a maximum of 5% within 5 minutes.
	Low-pressure testing
9	Switch off engine and press the brake pedal several times	In order to reduce the vacuum in the brake booster
10	Press down the brake pedal using the brake pedal jack (080) until the pressure gauge of the pressure tester (051) displays a line pressure of approx. 3 bar	Brake pedal winch Pressure tester	Fig 2
11	Check pressure drop	The line pressure must not drop within 2 minutes.
12	Disconnect pressure tester (051)
13	Remove brake pedal jack (080) with adapter for brake pedal jack
14	Bleed brake system		AR42.10-P-0010V
15	Lower vehicle		AR00.60-P-1000V
16.1	Activate easy entry/exit for driver seat	On vehicles with Memory package (driver seat, steering column, mirrors), code 275.	AR54.30-P-1000-02EDV
	Checking
	Risk of death  caused by body parts being pulled in by rotating vehicle wheels and roller dynamometer rollers	Do not insert your hand into rotating parts. Wear closed and snug-fitting work clothes. Safeguard areas with rotating vehicle parts and dynamometer rollers against unauthorized access. Safeguard roller dynamometer from unauthorized access.	-
17	Carry out brake test on the test stand
	Brake testing on test stand		AP42.00-P-4290V

FRONT AXLE BRAKE CALIPER

Number	Designation		Model 171
BA42.10-P-1002-10P	Bleed screw to brake caliper	Nm	7

REAR AXLE BRAKE CALIPER

Number	Designation		Model 171 except 171.473	Model 171.473
BA42.10-P-1002-12P	Bleed screw to brake caliper	Nm	7	7

Fig 2: Identifying Brake Pedal Winch (000 589 18 31 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Adapter For Brake Pedal Winch (211 589 00 31 00)

Courtesy of MERCEDES-BENZ USA