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Table of Contents > Descriptions of work > Brake and clutch system: changing brake fluid

VW Passat B8 Service Manual ➜ Brake and clutch system: changing brake fluid

Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
2)  
Spare wheel  
Part number  
Passat Estate Alltrack  
-3G0 010 000 CE-  
Half load  
bar  
Half payload, Convenience  
bar  
Full load  
bar  
Tyre size  
Front  
2.3  
Rear  
2.3  
Front  
Rear  
Front  
2.6  
Rear  
3.2  
1)  
---  
---  
All  
2
415/4.2/61  
T125/70 R18  
)
1)  
Valid for all authorised wheel/tyre combinations. ⇒ Wheels  
and tyres guide; Rep. gr. 44; Wheels, tyres, vehicle geometry;  
Wheel and tyre combinations  
2)  
Spare wheel  
Part number -3G0 010 000 BJ-  
Passat Estate Alltrack  
Full payload  
kPa/bar  
Half payload  
kPa/bar  
Tyre size  
Front  
Rear  
Front  
Rear  
245/45 R18 96W  
245/40 R19 94W  
220/2.2  
220/2.2  
250/2.5  
310/3.1  
Part number  
Passat Estate Alltrack  
-3G0 010 000 CJ-  
Half payload  
kPa/bar/psi  
Half load, comfort  
kPa/bar/psi  
Full payload  
kPa/bar/psi  
Tyre size  
Front  
Rear  
Front  
Rear  
Front  
Rear  
1)  
250/2.5/36  
250/2.5/36  
---  
---  
270/2.7/39  
330/3.3/48  
All  
2
415/4.2/61  
T125/70 R18  
)
1)  
Valid for all authorised wheel/tyre combinations. ⇒ Wheels  
and tyres guide; Rep. gr. 44; Wheels, tyres, vehicle geometry;  
Wheel and tyre combinations  
2)  
Spare wheel  
4.8  
Brake and clutch system: changing  
brake fluid  
Special tools and workshop equipment required  
♦ Torque wrench  
68  
4. Descriptions of work  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
♦ Brake filling and bleeding equipment -VAS 5234-  
♦ Brake filling and bleeding equipment -VAS 6860-  
♦ Insert tool -VAS 6564/9-  
♦ Tool set for brake bleeding -VAS 6564-  
4. Descriptions of work  
69  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
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.  
♦ Do not reuse extracted (used) brake fluid!  
♦ Observe relevant disposal regulations.  
Extracting brake fluid  
– Unscrew cap -1- from brake fluid reservoir.  
– Using the suction hose from brake filling and bleeding unit,  
extract as much brake fluid -2- from the brake fluid reservoir  
as possible through the strainer -1-.  
Note  
The strainer in brake fluid reservoir must remain in place.  
Ensure that no brake fluid runs through the strainer after  
completing the extraction (the brake fluid level in the reser‐  
voir must be even with the lower edge of the strainer).  
Connecting brake filling and bleeding equipment  
– Screw adapter -1- onto brake fluid reservoir.  
70  
4. Descriptions of work  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
– Connect filler hose from brake filling and bleeding unit to  
adapter -1-.  
– Set correct pressure on brake filling and bleeding equipment  
⇒ Operating Manual, and switch on brake filling and bleed‐  
ing equipment.  
Note  
The bleeder hose must be firmly seated on bleeder valve so  
that no air can enter the brake system.  
There must always be sufficient brake fluid in the brake res‐  
ervoir so that no air can enter the brake system through the  
reservoir.  
Start with front right brake caliper on RHD vehicles.  
Due to the tool attachment -VAS 6564/9- the rear wheels do  
not need to be removed any more.  
Front axle  
– Remove cap -1- from bleeder valve of front left brake caliper.  
– Push collector bottle bleeder hose -1- onto front left bleeder  
valve.  
4. Descriptions of work  
71  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
– Open bleeder screw, and let appropriate quantity of brake  
fluid run out ⇒ page 74 .  
– Close bleeder screw. Torque: ⇒ Brake system; Rep. gr. 47;  
Front brake caliper; Assembly overview - front brake caliper.  
– Fit cap back onto bleeder valve on brake caliper.  
– Repeat procedure on front right.  
Rear axle  
– Remove cover cap -1- from bleeder valve of rear left brake  
caliper.  
– Use tool attachment -VAS 6564/9- for rear axle.  
– Guide bleeder hose -1- from tool set for brake bleeding -VAS  
6564- from inner side of rim through socket -3-, and fit it onto  
bleeder valve.  
– Open bleeder screw, and let appropriate quantity of brake  
fluid run out ⇒ page 74 .  
– Close bleeder screw; torque: ⇒ Brake system; Rep. gr. 47;  
Rear brake caliper; Assembly overview - rear brake caliper.  
72  
4. Descriptions of work  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
– Fit again cover cap on bleeder valve of rear left brake cali‐  
per.  
– Repeat procedure on rear right of vehicle.  
Bleeding clutch slave cylinder  
Note  
Applies only to vehicles with manual gearbox.  
– If the bleeder valve -arrow- is not accessible, remove com‐  
plete air filter housing.  
– ⇒ Rep. gr. 23; Air filter; Removing and installing air filter  
housing  
Or  
– ⇒ Rep. gr. 24; Air filter; Removing and installing air filter  
housing  
– Remove dust cap from bleeder valve -arrow-.  
– Connect bleeder hose to bleeder valve and to pressure hose  
of fluid collector bottle.  
To bleed system, use 670 mm long bleeder hose -V.A.G 1238/  
B3-, if necessary.  
– Open bleeder valve.  
– Allow approx. 100 ml of brake fluid to flow out.  
– Close bleeder valve.  
– Rapidly operate pedal from stop to stop 10 to 15 times.  
– Open bleeder valve.  
– Allow another 50 ml of brake fluid to flow out.  
– Close bleeder valve and fit dust cap.  
Specified torque  
Bleeder valve  
Nm  
4.5  
– Depress clutch pedal several times after completion of  
bleeding process.  
– Switch off brake filling and bleeding unit.  
– Reinstall air filter housing in reverse order of removal.  
– Take filler hose off adapter.  
4. Descriptions of work  
73  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
– Unscrew adapter from brake fluid reservoir.  
– Check brake fluid level and adjust level if necessary. It must  
be between position -1- and -2-.  
– Screw cap -1- onto brake fluid reservoir.  
– Check function during road test.  
Table - Sequence and quantity of brake fluid  
Sequence  
Brake fluid quantity  
bleeder valves:  
which must flow out of bleeder valves:  
Brake caliper  
Front left  
Front right  
0.20 l  
0.20 l  
Wheel brake cylinder/brake caliper  
Clutch slave cylinder  
Rear left  
Rear right  
0.30 l  
0.30 l  
0.15 l  
Total quantity for automatic gearbox including  
the quantity extracted from the brake fluid res‐  
ervoir  
approx. 1.00 l  
Total quantity for manual gearbox including  
the quantity extracted from the brake fluid res‐  
ervoir  
approx. 1.15 l  
4.9  
Brake system and shock absorbers: in‐  
specting for leaks and damage  
Check following components for leaks and damage:  
♦ Brake master cylinder  
74  
4. Descriptions of work  

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