Volkswagen PASSAT Repair Manual page 181

ABS, ABS/EDL hydraulic unit, vacuum brake booster and brake master cylinder (Teves 20 GI), servicing
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After separating ABS control module from ABS
hydraulic unit, always install valve dome
transportation protection on hydraulic unit.
Warranty claims for ABS hydraulic units on which
the valve dome transportation protection was not
used will not be accepted.
Removing
CAUTION!
Determine correct radio anti-theft coding
before disconnecting the battery.
- Disconnect battery Ground (GND) strap.
- Remove coolant expansion tank and swing to
one side.
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12/7/2004