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

MODEL 164, 166

Fig 1: Checking Brake System With Pressure Tester - Shown On Model 164.1

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Brake System Components - Shown On Model 164.1

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

2.6.11

Clean the area around the cap on the brake fluid reservoir, added

Operation step 3

	Removing
	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.	AS42.50-Z-0001-01A
	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02GZ
1	Open engine hood and raise to vertical position	Model 164	AR88.40-P-1000GZ
1	Open engine hood and raise to vertical position	Model 166	AR88.40-P-1000GQ
2	Remove cover over left suspension strut tower	Model 166
	Clean
3	Clean the area around the cap on the brake fluid reservoir	LU cleaner	*BR00.45-Z-1028-04A
4	Unscrew cap on brake fluid reservoir and connect filling and bleeding unit	Pay attention to manufacturer's operating instructions. Brake fluid change unit with supply tank (10-20 l)
5	Detach corresponding complete wheel	Model 164	AP40.10-P-4050Z
5	Detach corresponding complete wheel	Model 166	AP40.10-P-4050EW
6	Remove bleed screw on brake caliper (2) of the brake circuit to be tested and connect pressure tester (3)	Pressure testers (3) for hydraulic fluid systems must not be used for systems with brake fluid. Otherwise, the brake fluid will be mixed with mineral oil. This results in brake failure! Pay attention to manufacturer's operating instructions. Otherwise, incorrect operation and measurement error can occur! Collect escaping brake fluid. Pressure tester
7	Bleed pressure tester (3)
8	Switch off filling and bleeding unit and vent pressure from brake fluid reservoir
	High-pressure check
9	Produce vacuum in brake booster	To do so, abruptly release accelerator pedal at medium engine speed.
10	Insert brake pedal jack (4) and read off and note brake line pressure	Only use the brake pedal jack (4) in combination with the adapter (6) and attach as shown. Otherwise, damage and measurement error can occur. In addition, immediately depress the brake pedal (5) as far as possible and install brake pedal jack (4) with adapter (6) as shown. Read off and note the brake line pressure after a few seconds on the high pressure gauge of the pressure tester (3).
			Fig 3
			Fig 4
11	Read off and note brake line pressure again	After 5 minutes. During the 5 minute duration of the test, the brake line pressure must not drop more than 5 % of the measurement that was read off and noted at the start.
	Low-pressure testing
12	Remove vacuum in brake booster	To do so, switch off engine, remove brake pedal jack (4) and depress brake pedal (5) several times.
13	Produce brake line pressure of 3 bar	To do so, press down on brake pedal (5) as far as possible and attach brake pedal jack (4) with adapter (6) as shown. Slowly turn back knob (1) until the low-pressure gauge on the pressure tester (3) displays a brake line pressure of 3 bar. Only use the brake pedal jack (4) in combination with the adapter (6) and attach as shown. Otherwise damage and measurement error can occur.
14	Read off brake line pressure again	After 2 minutes. The previously set brake line pressure must not fall throughout the 2 min duration of the test
15	Remove brake pedal jack (4)
16	Detach pressure tester (3) and screw bleed screw into brake caliper (2)	Collect escaping brake fluid.
			*BA42.10-P-1001-10L
			*BA42.10-P-1001-12L
17	Bleed brake system	Only bleed the brake caliper (2) to which the pressure tester (3) was connected.
		Model 164	AR42.10-P-0010GZ
		Model 166	AR42.10-P-0010CW
	Install
18	Mount complete wheel	Model 164	AP40.10-P-4050Z
18	Mount complete wheel	Model 166	AP40.10-P-4050EW
19	Detach filling and bleeding unit and attach cap on brake fluid reservoir
20	Install cover over left suspension strut tower	Model 166
21	Close engine hood	Model 164	AR88.40-P-1000GZ
21	Close engine hood	Model 166	AR88.40-P-1000GQ