VOLKSWAGEN PASSAT 1997 B3, B4 / 3.G Service Workshop Manual

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24 - Brake line connection Hydraulic unit to rear
right wheel cylinder Thread connection:
M12 x1, 18 Nm (13 ft
lb)
25 - Brake line connection Hydraulic unit to front
left brake caliper Thread connection:
M10 x1, 15 Nm (11 ft
lb)
26 - Brake line Master brake
cylinder/secondary
piston circuit to
hydraulic unit Page 5 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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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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Brake Pedal Position Sensor, removing
and installing

Note:
The Brake Pedal Position Sensor is only
supplied as a repair kit. Apart from the sender,
this repair kit contains a sealing ring, circlip and
four different spacer caps.

- - one white spacer cap
- - one green spacer cap
- - one blue spacer cap
- - one red spacer cap The spacer caps are of differing length. When replacing the sensor note the color of
spacer cap. The new sensor must have the
same color cap as the old sensor.
On the brake servo housing in the vicinity of the
sever location there is a colored spot, which is
identical to that of the spacer cap. Page 8 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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Removing

- Release brake servo vacuum by operating the
brake pedal several times.

- Remove connector from expansion tank.
- Swing coolant expansion tank to side.
- Pull connector off sensor. - Expand circlip with a small screwdriver in a
clockwise direction and pull sensor (arrow) out of
brake servo. Page 9 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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1 - Brake disc, not
ventilated When worn always
replace on both sides Brake disc diameter:
256 mm Brake disc thickness:
13 mm Wear limit: 11 mm 2 - Brake disc, ventilated When worn always
replace on both sides Brake disc diameter:
256 mm Brake disc thickness:
20 mm Wear limit: 18 mm 3 - Screw
4 - Countersunk screw To secure rotor Only on vehicles with
ABS Page 2 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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Repair Manual, Maintenance 5 - Brake pad With brake pad wear
indicator Always replace on
both sides Removing and
installing Page 46-6 Pad thickness: non-
ventilated brake disc,
14 mm Pad thickness:
ventilated brake disc,
11 mm Checking thickness Wear limit: 7 mm
(including backplate)
6 - Hub Removing and
installing from
Page 40-14 7 - Wheel speed sensor
rotor Only on vehicles with
ABS
8 - Hex bolt, 10 Nm (7 ft lb) 9 - Splash plate Page 3 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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10 - Wheel bearing housing 11 - Brake carrier with
guide pins and
protective caps Supplied as
replacement part
assembled with
sufficient amount of
grease on guide pins If protective caps are
damaged use repair kit Use grease packet
supplied to lubricate
guide pins
12 - Heat shield Install in piston 13 - Brake caliper housing Do not disconnect
brake hose when
changing brake pads Page 4 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