Check brake booster - AR43.10-P-0325GH

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

Fig 1: Identifying Procedure Components - Checking Brake Booster

	Inspect
1	Connect vacuum tester (030) to brake booster (16)	Reduce the vacuum in the brake booster (16) by pressing the brake pedal several times	AR43.10-P-0024-01GH
		Vacuum tester	Figure
		Test connection	Figure
		Brake booster data	*BE43.10-P-1001-01A
		Brake booster data	*BE43.10-P-1002-01A
2	Connect pressure tester (051) with connection fitting to brake caliper		*WH58.30-Z-1012-15A
3	Connect pedal force measuring instrument (060) at brake pedal		*WE58.40-Z-1003-19A
	Risk of accident as vehicle may start off by itself with the engine running. Risk of injury suffered in the form of bruises or burns to the hands when reaching in while the engine cranks or runs	Secure vehicle to prevent it moving off. Wear closed and close-fitting work clothes. Do not grasp hot or rotating parts.	AS00.00-Z-0005-01A
4	Start engine and generate specified vacuum by opening the throttle and suddenly releasing the accelerator pedal	If a considerably lower vacuum is achieved or if the vacuum decreases immediately, the O-ring between the brake booster and tandem master brake cylinder may be damaged, or the check valve in the vacuum line may be defective: ↓	*BE43.10-P-1003-01A
		Check non-return valve.	AR43.10-P-0023GH
		Remove and install stepped tandem master brake cylinder and replace O-ring.	AR42.10-P-0310GH
5	Apply specified force to brake pedal and read off line pressure.	The value measured must be within the value range.	*BE43.10-P-1003-01A
6	Remove pedal force measuring instrument (060) at brake pedal		*WE58.40-Z-1003-19A
7	Disconnect pressure tester (051) with connection fitting from brake caliper		*WH58.30-Z-1012-15A
8	Disconnect vacuum tester (030) from brake booster (16)		AR43.10-P-0024-01GH
		Vacuum tester	Figure
		Test connection	Figure
9	Bleed brake system.	After testing, only bleed the brake caliper to which the pressure tester was connected.	AR42.10-P-0010GH

Test values for pneumatic brake booster

Number	Designation					Model Series 163
BE43.10-P-1001-01A	Brake booster Ø				mm	279
BE43.10-P-1001-01A	Brake booster Ø				inch	11
BE43.10-P-1002-01A	Boost factor					≈5.6
BE43.10-P-1003-01A	Brake pipe line pressure	Suction pipe vacuum 0.750.8 bar	Force at brake pedal	50 N	bar	9-20
				100 N	bar	36-48
				150 N	bar	53-68
				200N	bar	70-85
				250N	bar	82-96

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

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

Commercially available tools

Number	Designation
WH58.30-Z-1012-15A	Pressure tester (hydraulic single / dual circuit brake systems)

Workshop equipment

WE58.40-Z-1003-19A

Pedal force meter