ABS/EDL/ASR/ESP Bosch 5.3, From M.Y. 2000
From m.y. 2000: hydraulic unit, brake servo/brake master cylinder, assembly overview
Vehicles from vehicle identity No. 3B Y 000 001
1 - Tandem brake servo
^ On gasoline engines the vacuum required is taken from the intake manifold.
^ From m.y. 2001, vehicles with a gasoline engine and automatic transmission are equipped with a brake vacuum pump, Refer to Vacuum Pump, Brakes, Service and Repair
^ On Diesel engines an exhauster is installed to create the required vacuum.
^ Functional check
- With engine switched off, depress brake pedal firmly several times (to exhaust the vacuum in the unit).
- Depress brake pedal with average foot pressure, hold and start engine. If the servo module is working properly, the pedal will drop slightly (servo assistance becomes effective).
- If faulty replace complete.
- Removing and installing, Refer to Vacuum Pump, Brakes, Service and Repair
2 - Brake line connection
^ To left-rear caliper
^ Marked on hydraulic unit with -HL-
3 - Brake line connection
^ To right-rear Caliper
^ Marked on hydraulic unit with -HR-
4 - Brake line
^ Master brake cylinder/secondary piston circuit to hydraulic unit
^ Marked on hydraulic unit with -HZ2-
5 - Brake line
^ Hydraulic unit to Electronic Stabilization Program (ESP) hydraulic pump
^ Marked on hydraulic unit with -VLP-
^ Marked with -HE- on Electronic Stabilization Program (ESP) hydraulic pump
6 - Brake line
^ To left-front brake caliper
^ Marked on hydraulic unit with -VL-
7 - Hex nut, 12 Nm
8 - Threaded stud
9 - Rubber damper
10 -ABS hydraulic unit
11 - Brake line
^ To right-front brake caliper
^ Marked on hydraulic unit with -VR-
12 - Retainer
13 - Hex bolt, 9 Nm
14 - Rubber damper
15 - Electronic stabilization program hydraulic pump
16 - Brake line
^ Brake master cylinder/primary piston circuit to Electronic Stabilization Program (ESP) hydraulic pump
^ Marked with -HZ- on Electronic Stabilization Program (ESP) hydraulic pump
17 - Hex nut, 9 Nm
18 - Rubber damper
19 - Connector for electronic stabilization program hydraulic pump
20 - Connection for brake fluid from brake fluid reservoir
^ Marked with -BA- on electronic stabilization program hydraulic pump
21 - Brake pressure sender
^ Always replace together with electronic stabilization program hydraulic pump
22 - Retainer
^ Application
^ See Parts Supplier
23 - Rubber damper
24 - Hex bolt
25 - Tandem brake master cylinder
^ Cannot be repaired. If faulty, replace complete.
^ Removing and installing, Refer to Brake Master Cylinder, Service and Repair
26 - T 45 torx socket head bolt, 25 Nm
27 - Self-locking nut, 49 Nm
28 - Sealing plug
^ Coat with brake fluid and press into brake fluid reservoir
29 - Brake fluid reservoir
30 - Oil seal
31 - Cap
32 - Vacuum hose
^ Insert into brake servo unit
33 - Oil seal
Connecting tandem brake master cylinder brake lines from electronic stabilization program hydraulic pump to ABS/EDL/ASR and ESP hydraulic unit
A - Hydraulic unit to electronic stabilization program hydraulic pump
Marked -VLP- on hydraulic unit,
Marked -HE- on electronic stabilization program hydraulic pump
B - Hydraulic unit to master cylinder secondary piston circuit
Marked -HZ2- on hydraulic unit
1 - Hydraulic unit to left-front brake caliper
Marked -VL- on hydraulic unit
2 - Hydraulic unit to right-front brake caliper
Marked -VR- on hydraulic unit
3 - Hydraulic unit to right-rear brake caliper
Marked -HR- on hydraulic unit
4 - Hydraulic unit to left-rear brake caliper
Marked -HL- on hydraulic unit