Assembly overview - Hydraulic unit, brake servo/ brake master cylinder (right-hand drive) — VW

Brake fluid reservoir cap
Brake fluid reservoir
Sealing plugs
Primary piston circuit brake pipe
Connecting on ABS vehicles
=>Page
45-26
.
Connecting on ABS/EDL vehicles
=>Page
45-26
.

Secondary piston brake pipe
Connecting on ABS vehicles =>Page
45-26
.
Connecting on ABS/EDL vehicles =>Page
45-26
.

Attention!
The brake pipes items 4 and 5 must not be interchanged when connecting.
Nut; 25 Nm
Tandem brake master cylinder
Sealing ring
Brake pedal position sender
Removing and installing
=> Page 45-29
Checking

=> Running gear - self-diagnosis; Repair group 01
Running gear - self-diagnosis

Spacer cap
Various versions => Page 45-29

Sealing ring
Renew

Circlip
Renew

Brake servo
Push rod
Brake pedal
Brake light switch
Gasket
Hexagon nut, 25 Nm

Bracket
Heat shield
Clip
Supply pipe
Brake fluid reservoir to brake master cylinder secondary piston circuit
Connecting => Fig.
3
.

Supply pipe
Brake fluid reservoir to master brake cylinder primary piston circuit
Connecting => Fig.
3
.

Attention!
The brake pipes, items 22 and 23 must not be interchanged when connecting.
Hexagon nut, 25 Nm
Heat shield

Mounting bush
Buffer
Brake pipe
Hydraulic unit to front right brake caliper

Brake pipe
Hydraulic unit to rear left brake caliper

Brake pipe
Hydraulic unit to rear right brake caliper

Brake pipe
Hydraulic unit to front left brake caliper

ABS or ABS/EDL hydraulic unit
Removing and installing
=> Page 45-26

Mounting bracket
Gasket
Reinforcing plate
Hexagon nut, 25 Nm

Connecting brake pipes from tandem master cylinder to hydraulic unit

Fig.1
Vehicles with ABS

A -
Secondary piston circuit
B -
Primary piston circuit

Fig.2
Vehicles with ABS/EDL

A -
Secondary piston circuit
B -
Primary piston circuit
1 -
Hydraulic unit to front right brake caliper
2 -
Hydraulic unit to rear left brake caliper
3 -
Hydraulic unit to rear right brake caliper
4 -
Hydraulic unit to front left brake caliper

Fig.3
Connecting supply pipes to hydraulic unit and reservoir

A -
Secondary piston circuit
Colour coding: green
Connect smaller diameter to top fitting on reservoir

B -
Primary piston circuit
Colour coding: yellow
Connect larger diameter to bottom fitting on reservoir

Notes.

The supply pipe connections to the hydraulic unit have different diameters.
Colour coding on supply pipes -arrows- correspond to the colour coding of the hydraulic unit connections.
The supply pipes must be fitted as far as the stops on the hydraulic unit connections and at least 17 mm onto the reservoir connections.
First fit supply pipes to hydraulic unit, clip into retainer and then fit onto reservoir connection.