911 Targa (996) F6-3.6L (2004)
Vacuum Brake Booster: Service and Repair
Converting Brake Booster (Bellows)
Converting brake booster (bellows)
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2 bellows variants have been installed as standard in the 911 Carrera (996) (first version -A- and new/current version -B-).
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The bellows variant of the first version -A- is no longer available as a spare part. The version must be installed in the event of repair -A1-
(conversion described in the following).
Note!
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The conversion described in the following only applies for vehicles in which the bellows first version A (with 2 rubber bellows -1 and 2-) is
installed!
Overview of bellows conversion
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To convert the bellows variant -A- to version -A1-, the hydraulic unit, the brake booster -4- with brake master cylinder and the intermediate piece
-11- must be removed.
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The assembly of the brake master cylinder with the brake booster -4- must not be disconnected for removal and installation if both parts should be
continued to be used!
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To remove the intermediate piece -11-, the battery must be removed! This will prevent damage of the components in the surrounding area.
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The following parts must be exchanged or replaced for first installation of variant -A1- (replacement ausführung):
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Remove short bellows -2- on the brake booster and the long bellows -1- on the firewall.
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Remove the grommet (rubber groove ring) -3- for mounting the long (former) bellows (not replaced).
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The following parts are used in place of the removed parts -1 / 2 / 3- : Bellows -B- (already mounted on new brake boosters), connection
sleeve -7.1- with sealing ring -7.3-, the seal for the firewall -7.2- and the hose clamps (clamps) -6 and 6.1-.
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The two push rods -12 and 9- are to be replaced with the modified version -12.1 and 9.1-.