Test Brake System With Pressure Tester For Leaks - AR42.10-P-0015GW

Model 463 (except 463.270/271) as of model year 2013 up to model year 2019 

Courtesy of MERCEDES-BENZ USA

	Check
	Risk of poisoning  from swallowing brake fluid. Risk of injury  from skin and eye contact with brake fluid	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.  Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02A
1	Remove left front wheel
	Remove/install wheels, rotate if necessary		AP40.10-P-4050G
2	Clean area surrounding cap on brake fluid expansion reservoir
3	Unscrew cap from brake fluid expansion reservoir
4	Connect brake fluid changer to brake fluid expansion reservoir	Observe manufacturer's operating instructions.
5	Unscrew bleed screw on front left brake caliper and connect pressure tester (051)	Pressure testers for hydraulic oil systems must not be used for systems with brake fluid. Otherwise, the brake fluid may be mixed with mineral oil and this will cause the brake system to malfunction! Observe manufacturer's operating instructions.
6	Bleed pressure tester (051)
	High-pressure test
7	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running. Allow the engine to run at moderate speed and release the accelerator pedal suddenly	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. In order to produce as high a vacuum as possible in the brake booster.	AS00.00-Z-0005-01A
8	With the engine running, depress brake pedal as far as possible using the brake pedal jack (080) and apply brake pedal jack (080)	Cover brake pedal and driver's seat in the contact area of the brake pedal jack (080). Otherwise the brake pedal or the driver seat may be damaged.
		Brake pedal jack	Fig 1
9	Read off and note brake pressure on high-pressure gauge of pressure tester (051)
10	Read off and note brake pressure again after 5 minutes on the high-pressure gauge of pressure tester (051)	During the 5 min. duration of the test, the brake pressure may not drop more than 5 %.
	Low-pressure test
11	Switch off engine and operate brake pedal several times until vacuum is reduced
12	Turn back brake pedal winch (080) until a line pressure of approx. 3 bar overpressure is indicated on the pressure gauge
13	Read off and note the brake pressure after 2 minutes on the low pressure gauge of pressure tester (051)	The brake pressure must not drop during the 2 min duration of the test.
14	Remove brake pedal jack (080)
15	Detach pressure tester (051) and screw in bleed screw at left front brake caliper	Bleed screw at front axle fixed brake caliper	*BA42.10-P-1001-02B
16	Bleed brake system	Bleed brake system Model 463 (except 463.270/271) as of model year 2013 up to model year 2019	AR42.10-P-0010GW

Fig 1: Identifying Brake Pedal Jack (000 589 18 31 00)

Courtesy of MERCEDES-BENZ USA