Checking check valve - AR43.10-P-0023I

Models 215, 220

Shown on model 220

Fig 1: Checking Check Valve (Shown On Model 220)

Courtesy of MERCEDES-BENZ USA

	Check
1	Press the brake pedal several times until the vacuum in the brake booster is reduced
2	Connect tester (030) to brake booster	Measuring connection (031) for checking the check valve (17) and/or brake booster (16).	AR43.10-P-0024-01I
		Vacuum tester	Fig 2
		Test connection	Fig 3
3	Start the engine and produce a vacuum of 0.75 to 0.80 bar by opening the throttle and suddenly releasing the accelerator pedal	Reduce vacuum >0.8 bar by depressing the brake pedal.
4	Switch off engine	Vacuum must not drop by more than 0.2 bar within 30 seconds. Vacuum loss > 0.2 bar, replace vacuum line, if necessary: ↓
4	Switch off engine	Check brake servo	AR43.10-P-0325I
5	Disconnect tester (030) from brake booster	Vacuum tester	Fig 2
5	Disconnect tester (030) from brake booster	Test connection	Fig 3

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

Courtesy of MERCEDES-BENZ USA

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

Courtesy of MERCEDES-BENZ USA