Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤
Maintenance - Edition 11.2020
♦ Brake servo (for anti-lock brake system: hydraulic unit)
♦ Brake pressure regulator and
♦ Brake caliper
♦ Shock absorbers (during inspection only)
♦ Presence of dust caps on brake fluid bleeder screws
♦ Presence of caps on guide bushes
– Ensure that brake hoses are not twisted.
– Additionally ensure that brake hoses do not touch any vehi‐
cle components when steering is at full lock.
– Check brake hoses for abrasion, porosity and brittleness.
– Check brake lines for corrosion.
– Check brake connections and fastenings for correct seating,
leaks and corrosion.
– Check brake lines and brake hoses for correct seating and
attachment in retainers.
NOTICE
Faults found must always be rectified (repair measure).
4.10
Brakes, front and rear: checking thick‐
ness of brake pads and condition of
brake discs
Front disc brake pads: checking thickness ⇒ page 76
Rear disc brake pads: checking thickness ⇒ page 77
Brake discs: checking condition ⇒ page 78
Special tools and workshop equipment required
♦ Torque wrench
♦ Battery lamp -VAS 6901-
♦ Mirror
The adapter to loosen and tighten the anti-theft wheel bolts can
be found in the vehicle tool kit ⇒ page 143 .
4. Descriptions of work
75
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤
Maintenance - Edition 11.2020
4.10.1
Front disc brake pads: checking thick‐
ness
Note
One some vehicles it may be very difficult to ascertain or meas‐
ure the thickness of the pad due to the geometry of the wheel
rim. If this is the case, remove the wheel on the side where
the brake pad wear indicator is installed for better evaluation or
measurement of the remaining pad thickness.
Sequence of operations
– Measure outer and inner brake pad thickness by inspecting
through the holes of wheel rim (depending on type).
– For better evaluation or measurement of remaining pad
thickness, remove wheel on side where brake pad wear indi‐
cator is installed as necessary.
– Pull off wheel bolt covers if necessary ⇒ page 143 .
– Mark position of wheel relative to brake disc.
– Unbolt wheel bolts and remove wheel.
– Measure inner and outer pad thickness.
a - Pad thickness “without” backplate
Wear dimension: 2 mm
NOTICE
The brake pads have reached their wear limit at a pad thick‐
ness of 2 mm (without backplate) and must be renewed (re‐
pair measure).
Note
When replacing brake pads, always check brake discs as well
for wear! Checking and if necessary replacing the brake discs is
a repair measure.
Sequence of operations
– Check brake disc for wear ⇒ Brake system; Rep. gr. 46;
Front brake; Assembly overview - front brake.
– If necessary, secure wheel in marked position.
76
4. Descriptions of work
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤
Maintenance - Edition 11.2020
– Tighten wheel securing bolts in diagonal sequence to speci‐
fied torque ⇒ page 143 .
– Place adapter in vehicle tool kit after completing work.
– Fit wheel bolt covers if necessary .
4.10.2
Rear disc brake pads: checking thick‐
ness
Note
One some vehicles it may be very difficult to ascertain or meas‐
ure the thickness of the pad due to the geometry of the wheel
rim. If this is the case, remove the wheel on the side where
the brake pad wear indicator is installed for better evaluation or
measurement of the remaining pad thickness.
Sequence of operations
– Illuminate area behind hole in rim using an electric hand
torch.
– Inspect outer pad to determine its thickness.
– Illuminate inner pad with an electric hand torch and mirror.
– Determine thickness of inner pad by inspecting.
a - Inner and outer pad thickness “without” backplate
Wear dimension: 2 mm
NOTICE
The brake pads have reached their wear limit at a pad thick‐
ness of 2 mm (without backplate) and must be renewed (re‐
pair measure).
Note
When replacing brake pads, always check brake discs as well
for wear! Checking and if necessary replacing the brake discs is
a repair measure.
Sequence of operations
– Check brake disc for wear ⇒ Brake system; Rep. gr. 46;
Rear brake; Assembly overview - rear brake.
– If necessary, secure wheel in marked position.
4. Descriptions of work
77
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤
Maintenance - Edition 11.2020
– Tighten wheel securing bolts in diagonal sequence to speci‐
fied torque ⇒ page 143 .
– Place adapter in vehicle tool kit after completing work.
– Fit wheel bolt covers if necessary .
4.10.3
Brake discs: checking condition
– Check all brake discs for the following damage patterns:
♦ Cracks
♦ Scoring
♦ Rust (no surface rust)
♦ Burrs on circumference of brake disc
Note
Inform customer if brake disc damage is similar to these dam‐
age patterns. Renewing the brake discs is a repair measure.
4.11
Brake fluid level: Check
NOTICE
♦ Never allow brake fluid to come into contact with fluids
that contain mineral oils (e.g. oil, petrol, cleaning agents).
Mineral oils will damage seals and rubber grommets of
brake system.
♦ Brake fluid is poisonous. In addition, due to its corrosive ef‐
fect, brake fluid must not come into contact with paintwork.
♦ Brake fluid is hygroscopic, which means it absorbs mois‐
ture from the ambient air and should therefore always be
stored in air-tight containers.
♦ Rinse off spilled brake fluid using plenty of water.
♦ Observe relevant disposal regulations.
When replenishing, ensure to not spill any liquids in the en‐
gine compartment.
Spilled liquids may cause damage in the motor compartment.
Toothed belts, V-belts and poly V-belts which came into con‐
tact with oil, brake fluid or coolant must always be renewed.
Brake fluid level at delivery inspection
– At delivery inspection, the fluid level must be at MAX. mark‐
ing -1-.
78
4. Descriptions of work
2024 VW Passat Owner's Manual
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