Ford Transit 2002 Owner's Manual page 686

24. Remove the brake booster vacuum pump.
Discard the O-ring seal.
25. Remove the brake booster vacuum pump drive
tappet.
26. Using the special tools, remove the valve collets.
NOTE: Make a note of the position of the
27.
valve springs and valve retainers to make
sure they are installed in the same position.
Remove the valve springs with valve retainers.
28. Using the special tool, remove the valve stem
seals.
Discard the seals.
29. NOTE: Make a note of the position of the
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