Checking Brake Booster - AR43.10-P-0325GW

Model 463 

as of model year 2013 up to model year 2019 

Courtesy of MERCEDES-BENZ USA

	Check
1	Connect vacuum tester to brake booster i33	Connect/disconnect testing unit at brake booster	AR43.10-P-0024-01GW
		Vacuum tester	Fig 2
2	Connect pressure tester (051) to brake caliper using connection fitting	Use correct connection fitting (pitch, cone etc.). Leaks and measurement errors can otherwise occur. Bleed screw at front axle fixed brake caliper	*BA42.10-P-1001-02B
3	Start engine and by opening the throttle j A produce a vacuum of 0.6 to 0.8 bar.	If only a substantially lower vacuum is attained or if the vacuum immediately falls away, the seal between the brake booster and the tandem master brake cylinder may be damaged or the check valve in the vacuum line may be defective. The vacuum pump may also be defective.
4	Apply specified force to the brake pedal and read line pressure	Brake line pressure	*BE43.10-P-1003-01B
		Brake pedal jack	Fig 1
5	Detach pedal force meter (060) from brake pedal.
6	Detach pressure tester (051) from test connections	On vehicles without test connections, detach the pressure tester (051) with the connection fitting from the brake caliper.
7	Detach vacuum tester from brake booster
8	Bleed brake system i4	Bleed brake system Model 463 (except 463.270/271) as of model year 2013 up to model year 2019 Only Weed the brake caliper to which the pressure tester (051) was connected.	AR42.10-P-0010GW

Fig 1: Identifying Brake Pedal Jack (000 589 18 31 00)

Courtesy of MERCEDES-BENZ USA

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

Courtesy of MERCEDES-BENZ USA