ABS/EDL/ASR/ESP Bosch 5.7, From Model Year 2002

Hydraulic unit, brake servo/brake master cylinder assembly overview
1 - Tandem brake servo
^ On gasoline engines the vacuum required is taken from the intake manifold.
^ 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, a vacuum pump is installed to produce vacuum.
^ Functional check
- With engine switched off, depress brake pedal firmly several times (to exhaust the vacuum in the module).
- 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.
^ With bonded seal
^ Removing and installing, Refer to Brake Master Cylinder, Service and Repair
2 - Brake line
^ Brake master cylinder/primary piston circuit to hydraulic control unit
^ Marked on hydraulic unit with -HZ1-
3 - Brake line
^ Brake master cylinder/secondary piston circuit to hydraulic unit
^ Marked on hydraulic unit with -HZ2-
4 - Brake line
^ To left-front brake caliper
^ Marked on hydraulic unit with -FL-
5 - Brake line
^ To right-front brake caliper
^ Marked on hydraulic unit with -FR-
6 - Brake line
^ To right-rear Caliper
^ Marked on hydraulic unit with -RR-
7 - Brake line
^ To left-rear caliper
^ Marked on hydraulic unit with -RL-
8 - Brake pressure sensor
^ Removing and installing, Refer to Powertrain Management, Brake Pressure Switch, Service and Repair
9 - ABS hydraulic unit
^ ABS Return Flow Pump -V39- and valve block must not be separated from each other.
^ Control module and hydraulic unit, disassembling and assembling, Refer to Hydraulic Control Assembly, Service and Repair
10 - Control module
^ Control module and hydraulic unit, disassembling and assembling, Refer to Hydraulic Control Assembly, Service and Repair
11 -Bolt, 3 Nm
12 - Circlip
13 - Buffer
14 - Bracket
^ Application
^ See Parts Supplier
15 - Hex bolt, 9 Nm
16 - Seal
17 - Tandem-brake master cylinder
^ Cannot be serviced. Replace as complete unit if malfunctioning.
^ Remove and install together with brake booster, Refer to Brake Master Cylinder, Service and Repair
18 - Self-locking nut, 49 Nm
19 - Bolt, T45 Torx, 25 Nm
20 - Brake fluid reservoir
21 - Cap
22 - Sealing plugs
^ Coat with brake fluid and press into brake fluid reservoir
23 - Bolt, 10 Nm
24 - Vacuum hose
^ Insert in brake booster