Hydraulic Unit, Brake Servo/Brake M/C From M.Y. 2000: Overview

Hydraulic unit, brake servo/brake master cylinder from m.y. 2000: assembly overview
Vehicles from VIN 3B Y 000 001





1 - Tandem brake servo
^ On gasoline engines the vacuum required is taken from the intake manifold.
^ From model year 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.
^ Function 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.
- Removing and installing, Refer to Vacuum Brake Booster, 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
5 - Brake line
^ Brake master cylinder/primary piston circuit to hydraulic unit
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 - Retainer
^ Application
^ See Parts Supplier
15 - Rubber damper
16 - Hex bolt
17 - Tandem brake master cylinder
^ Cannot be repaired. If faulty, replace.
^ Removing and installing, Refer to Brake Master Cylinder, Service and Repair
18 - T 45 torx socket head bolt, 25 Nm
19 - Self-locking nut, 49 Nm
20 - Sealing plug
^ Coat with brake fluid and press into brake fluid reservoir
21 - Brake fluid reservoir
22 - Oil seal
23 - Cap
24 - Vacuum hose
^ Insert into brake servo module
25 - Oil seal





Connecting tandem brake master cylinder brake lines to the hydraulic unit for ABS/EDL front and All Wheel Drive (AWD) and ABS/EDL/ASR Front Wheel Drive (FWD)
A - Secondary piston circuit
B - Primary piston circuit
1 - Hydraulic unit to left-rear parking brake caliper
2 - Hydraulic unit to right-rear parking brake caliper
3 - Hydraulic unit to right-front brake caliper
4 - Hydraulic unit to left-front brake caliper