brake fluid VOLKSWAGEN PASSAT 1995 B3, B4 / 3.G Service User Guide

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Hydraulic unit, removing and installing

Note:
For easier disassembling and assembling, it is
more practical to remove the hydraulic unit
complete with brake servo and brake master
cylinder.

Removing

- Disconnect battery Ground (GND) strap.
- Separate all electrical connections on ABS
unit.

- Remove as much brake fluid as possible from
brake fluid reservoir using a suction bottle.

- Disconnect brake lines from ABS hydraulic unit
and seal threaded holes with plugs from repair
kit, Part No. 1HO 698 311.

- Remove left-hand trim under instrument
panel.

- Disconnect brake pedal from brake servo unit
Page 46-44 . Page 6 of 10Assembly overview - hydraulic unit, brake servo/brake master cylinder12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.45.4

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- Remove nuts from brake servo/bulkhead.
- Carefully remove hydraulic unit and brake servo
with brake master cylinder from engine
compartment.

Installing

Note:
Hydraulic units supplied as replacement parts
are already filled with hydraulic fluid and bled.
Only remove sealing plugs on hydraulic unit
when the relevant brake line is going to be
connected.
If the sealing plugs are removed too early,
brake fluid can escape, it is then no longer
guaranteed that the unit is sufficiently filled or
adequately bled.

- Preassemble hydraulic unit and brake servo with tandem master cylinder away from vehicle.

- Secure hydraulic unit, brake servo with tandem
master cylinder to bulkhead.

- Connect brake lines.
- Reconnect all electrical connections on ABS unit (ensure correctly connected).

- Bleed brake system Page 47-27 .
- Install left-hand trim under instrument panel. Page 7 of 10Assembly overview - hydraulic unit, brake servo/brake master cylinder12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.45.4

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Installing

Note: When installing new circlip ensure opening is
uppermost - installation position (arrow).
- Install new sealing ring to sensor. (Coat sealing
ring with lubricant e.g. soft soap). Note: - Sensor notch must point downward when inserting
into brake servo and be heard to engage.
- Connect sensor unit connection and ensure
correctly located. To ensure correctly seated pull senor by hand. Leaks at the sensor sealing ring, result in
insufficient braking vacuum and poor engine
idling. For ease of illustration, shows installing the
sensor with brake fluid reservoir removed. Page 10 of 10Assembly overview - hydraulic unit, brake servo/brake master cylinder12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.45.4

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Front brakes,
servicing (Girling
caliper)
Note: After replacing brake pads,
depress brake pedal firmly
several times with vehicle
stationary so that the brake
pads are properly seated in
their normal operating
position. To remove brake fluid from
the reservoir, use a bleeder
bottle which is used only for
brake fluid. Brake fluid is
poisonous and must on not
be siphoned by mouth
using a hose! Wheel bolt tightening
torque: 110 Nm (81 ft lb) Page 1 of 7Front brakes, servicing (Girling caliper)12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.1

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Installing

Note:
Before inserting new brake pads, press piston
back into the cylinder with resetting tool. Before
pressing the piston back, remove some brake
fluid from the reservoir with a bleeder bottle. If
reservoir has been topped up, fluid may overflow
and cause damage. Note: - Press piston back. - Install brake pads. - Swing brake caliper housing down and tighten bolt. The repair kit contains two self-locking bolts which must always be installed. After replacing the brake pads, depress brake
pedal firmly several times with the vehicle
stationary so that the brake pads are properly
seated in their normal operating position. Page 7 of 7Front brakes, servicing (Girling caliper)12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.1

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Installing
Note:
Before installing new brake pads, press piston back
into the cylinder with resetting tool. Before pressing
the piston back, remove some brake fluid from the
reservoir with a bleeder bottle. If reservoir has been
topped up, fluid may overflow and cause damage. - Remove both guide pins from brake caliper. - Remove brake caliper housing and lay to one side
so that weight of brake caliper does not stress or
damage brake hose.
- Take brake pads out of brake caliper housing or
from brake carrier. - Pressing piston back. Page 6 of 7Front brakes, servicing (Teves/Ate)12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.2

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Note:
Care is to be exercised to ensure the seal is not
damaged when lifting the dust boot (only use a blunt
instrument, e.g. plastic wedge). Fig. 1 Wheel cylinder, checking for leaks - Lift dust boot - If brake fluid is found in the dust boot then replace
wheel cylinder Page 4 of 8Rear wheel brakes, servicing12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.4

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Installing

Note:
Before pressing the piston back, remove some
brake fluid from the reservoir. Use a bleeder
bottle or a plastic bottle which is only used for
brake fluid. Brake fluid is poisonous and must not
be siphoned by mouth through a hose. Note: - Thread in piston by turning knurled wheel of
special tool 3272 clockwise.
- Install brake pads. Install special tool 3272 so that the collar (arrow)
of the tool is seated against the brake caliper. If the piston is difficult to move, use a 13 mm
open end wrench on the flats (arrow A) provided
for this purpose. If the piston is pushed back with a piston resetting
tool or by operating the foot brake, the automatic
adjustment in the brake caliper will be destroyed. Page 8 of 10Rear wheel brakes, servicing (disc brakes)12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.5

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- Secure brake caliper housing with new self-
locking bolts. Note: - Attach parking brake cable (arrow) to brake caliper housing. After each brake pad change firmly depress brake
pedal several times with vehicle stationary, so
that the brake pads are properly seated in their
normal operating position. After changing brake pads check brake fluid level. Page 9 of 10Rear wheel brakes, servicing (disc brakes)12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.46.5

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7 - Sealing ring Always replace 8 - Self-locking hex nut, 20 Nm (15 ft lb)
9 - Brake master cylinder Cannot be repaired. If
faulty, replace
complete.
10 - Sealing plug Moisten with brake
fluid and press into
reservoir
11 - Seal Page 3 of 4Assembly overview: brake master cylinder/brake servo12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.47.1