Volkswagen Golf / Golf GTI / Jetta. Manual — part 471

47-30

Checking and adjusting pressure

Note:

The brake pressure regulator is set with the

vehicle unladen

1)

.

- Lift vehicle and connect the pressure gauges to

left front brake caliper and to right rear wheel
cylinder/caliper.

- Bleed both gauges.

- Lower vehicle and bounce rear of vehicle

several times.

- Press brake pedal and measure pressures.

- Compare figures attained with specifications,

Page 47-31

, and if necessary adjust.

1)

The term "unladen" means: The weight of the

vehicle ready for the road which has a:

Driver's weight of 75 kg (165.34 lb).

Full fuel tank.

Spare wheel, vehicle tool kit and jack installed to

relevant stowage points on vehicle.

The fluid reservoir for the windshield/headlight

washer system must be full.

Brake pressure regulator, assembly overview

47-31

Specifications for load dependent brake pressure regulator

Model / Version

Bar (psi)

Bar (psi)

Rear disc brakes Front axle

70 (1015)

Front axle

100 (1450)

Rear axle 36 to 42 (522-609) Rear axle 49 to 55 (710-798)

Brake pressure regulator, assembly overview

47-32

Adjusting brake pressure regulator

Rear axle test pressure too high:

- Release regulator spring.

Rear axle test pressure too low:

- Increase tension regulator spring.

Note:

Do not adjust with brake pedal depressed. Use

the following work sequence:

Read off figures:

- Release pedal.

- Adjust spring.

Press pedal again:

- Read off figures and if necessary, readjust.

- Remove pressure gauge and bleed brake

system

Page 47-38

.

Brake pressure regulator, assembly overview

47-33

Brake system, bleeding

Vehicles with ABS and ABS/EDL

When at least one chamber in the brake fluid

reservoir is completely empty (e.g. leaks in
braking system) the hydraulic unit must be bled
using the VAG 1551 scan tool in function 04,
"basic setting".

Basic setting

Repair Manual, Brake System On Board

Diagnostic (OBD), Repair Group 01

WARNING!

Do not exceed a filling pressure of 1 bar (14.5
psi) when filling with brake fluid using brake
filler and bleeder unit VAS 5234. The brake
system will not be completely bled if
excessive pressure is used.

Note:

Bleeding the brake system on vehicles with

ABS is the same as for vehicles with
conventional braking systems with the
exception of using function 04 to bleed systems
that have been completely empty.

Brake fluid absorbs moisture from the air and

must therefore be replaced every two years.
Use only new, unused and approved brake fluid
that complies with MVSS 116 DOT 4.

Brake system, bleeding