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

MODEL 211, 219 with Adaptive Brake (ABR)

Fig 1: Testing Brake System For Leaks Using Pressure Tester

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

MODIFICATION NOTES

29.7.09	Value changed: Bleed screw to brake caliper	*BA42.10-P-1002-10B
29.7.09	Value changed: Bleed screw to brake caliper	*BA42.10-P-1002-10H

	Checking
	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
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02V
	Notes on repairs to brake system		AH42.00-P-0003-01A
1	Deactivate easy entry/exit	Vehicles with memory package (driver seat, steering column, mirrors) code 275
2	Connect brake fluid changing unit to expansion reservoir (1)	Observe manufacturer's operating instructions! Brake fluid changing unit, see GOTIS http://gotis.aftersales.mercedes-benz.com
3	Detach left front wheel	Vehicles with 6-piston or 8-piston brake calipers
	Remove/install wheels	Model 211	AP40.10-P-4050Z
	Remove/install wheels	Model 219	AP40.10-P-4050TX
4	Remove bleed screw at the left front brake caliper (2) and connect pressure tester (01)	Pressure testers (01) for hydraulic oil systems must not be used for systems with brake fluid otherwise the brake fluid is mixed with mineral oil which can lead to brake failure! Use the correct connection fitting (pitch, taper etc.), otherwise leakage and measurement errors will occur. Follow the manufacturer's operating instructions in order to avoid measurement errors and incorrect operation. Model 211:
		Bleed screw to brake caliper Model 219:	*BA42.10-P-1002-10H
		Bleed screw to brake caliper Pressure tester (for hydraulic single circuit and dual-circuit brake systems)	*BA42.10-P-1002-10B
5	Bleed pressure tester (01)
6	Switch off brake fluid changing unit and release pressure
	High-pressure check
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
7	Allow the engine to run at moderate speed and release the accelerator pedal suddenly	In order to produce the highest possible vacuum in the brake booster (3).	AS00.00-Z-0005-01A
8	Immediately press down brake pedal as far as possible and insert brake pedal jack (02) with adapter between brake pedal and seat	Protect brake pedal and seat against damage.
		Adapter for brake pedal winch	*211589003100
		Brake pedal winch	*000589183100
9	Read off and note brake pressure on high-pressure gauge of pressure tester (01)
10	Read off and note brake pressure again after 5 minutes on the high-pressure gauge of the pressure tester (01)	During the 5 min duration of the test, the brake pressure may not drop more than 5 %.
	Low-pressure testing
11	Switch off engine and loosen brake pedal jack (02)
12	Push down brake pedal several times	In order to reduce the vacuum in the brake booster (3).
13	Depress brake pedal as far as possible and insert the brake pedal jack (02) with adapter for brake pedal jack between the brake pedal and seat	Protect brake pedal and seat against damage.
		Adapter for brake pedal winch	*211589003100
		Brake pedal winch	*000589183100
14	Move back brake pedal jack (02) slowly	Until a brake pressure of approx. 3 bar is displayed on the low pressure gauge of the pressure tester (01).
15	Read off and note the brake pressure after 2 minutes on the low pressure gauge of the pressure tester (01)	The brake pressure must not drop during the 2 min duration of the test.
16	Remove brake pedal jack (02) and adapter for brake pedal jack
17	Detach the pressure tester (01) and screw the bleed screw into the brake caliper (2)
18	Bleed brake system		AR42.10-P-0010-02SX
19	Mount left front wheel	Vehicles with 6-piston or 8-piston brake calipers
	Remove/install wheels	Model 211	AP40.10-P-4050Z
	Remove/install wheels	Model 219	AP40.10-P-4050TX
20	Detach brake fluid change unit
21	Check fluid level in expansion reservoir (1), correct if necessary	Cap on brake fluid expansion reservoir	*BA42.50-P-1001-01D
	Brake system - inspect fluid level	Model 211	AP42.10-P-4210Z
	Brake system - inspect fluid level	Model 219	AP42.10-P-4210TX