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

MODEL 204, 207 

Fig 1: Identifying Check Valve

Courtesy of MERCEDES-BENZ USA

	Checking
1	Eliminate the vacuum in brake booster (A7/7)	To do this, press the brake pedal several times with the engine switched off.
2	Open engine hood and raise to vertical position	Model 204
		Type 207	AR88.40-P-1000EW
3	Connect vacuum tester (030) to brake booster (A7/7) with test connection (031)		AR43.10-P-0024-01V
			Fig 2
			Fig 3
4	Start the engine and produce a vacuum of 0.75 to 0.8 bar by pressing and suddenly releasing the accelerator pedal	Reduce vacuum >0.8 bar by depressing the brake pedal several times.
5	Turn off engine	The vacuum must not reduce by more than 0.2 bar within 30 seconds. In the event of a vacuum loss >0.2 bar: Replace vacuum line (8) with check valve (17). ↓ If necessary:
		Check brake booster.	AR43.10-P-0325CW
6	Detach vacuum tester (030) with test connection (031) from brake booster (A7/7)

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

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

Courtesy of MERCEDES-BENZ USA