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

MODEL 216.### 1# 

MODEL 221.### 1# 

Fig 1: Checking Check Valve

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Operate the brake pedal several times when the engine is switched off	Until the vacuum in the brake booster (A7/7) is reduced.
2	Connect vacuum tester (01) to brake booster (A7/7) with test connection (02)		AR43.10-P-0024-01V
			Fig 2
			Fig 3
	Checking
3	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.
4	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 (1) with check valve (2): ↓
		Except model 221.095/195	AR43.10-P-0355SX
		Model 221.095/195 If necessary: ↓	AR43.10-P-0355SXH
		Check brake booster.	AR43.10-P-0325SX
5	Install in the reverse order

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

Courtesy of MERCEDES-BENZ USA

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

Courtesy of MERCEDES-BENZ USA