Checking non-return valve - AR43.10-P-0023GH

MODEL 163.113 /128 /136 /154 /157 /172 /174 /175 

Fig 1: Identifying Procedure Components - Checking Non-Return Valve

	Inspect
1	Connect vacuum tester (030) to brake booster (16)	Reduce vacuum of brake pedal by pressing pedal several times.	AR43.10-P-0024-01GH
		Vacuum tester	Fig 2
		Test connection	Fig 3
2	Risk of accident.  Accidents may result if the vehicle starts off unintentionally with the engine running. Risk of injury  as working around the engine during start-up or while running may result in contusions and burns Start the engine and produce a vacuum of 0.75...0.80 bar by accelerating and suddenly releasing the accelerator pedal	Secure vehicle to prevent it moving off. Wear closed and close-fitting work clothes. Do not grasp hot or rotating parts. Reduce vacuum > 0.8 bar by pressing brake pedal.	AS00.00-Z-0005-01A
3	Switch off engine	Vacuum must not drop by more than 0.2 bar within 30 seconds. If vacuum loss is > 0.2 bar, replace vacuum line: ↓ Check brake booster if necessary.	AR43.10-P-0325GH
4	Disconnect vacuum tester (030) from brake booster (16)		AR43.10-P-0024-01GH

Fig 2: Identifying Vacuum Tester (201 589 13 21 00)

Fig 3: Identifying Test Connector (168 589 08 63 00)