Brake Booster - Design Update

911 (996)
1/01 4770

Binder - Group 4, Running Gear

3-30-01

Brake Booster / Spare Parts Requirements

Vehicle Type:
911 Carrera (996) / 911 Carrera 4 (996)

Model Year:
As of '98 (W)

Concerns:
Brake booster

Information:

A modification in the body firewall has dictated a modification in the brake booster bellows. The replacement brake booster is supplied with the new style bellows. It is not possible to retrofit the new style bellows to the older vehicles. See VIN list below.

In the case of vehicles produced before the introduction date stated below, the fitted bellows must be exchanged first before the brake booster is replaced.

Introduction:

September 13, 1999

VIN's:

99 1YS 62 0337 USA - Coupe
99 5YS 65 0546 USA - Cabriolet

Parts:





Spare Parts Requirements





Parts Allocation

Repair Procedure:

The following measures are necessary before the installation of a new brake booster (996 355 923 00) in vehicles before the stated introduction date:

- Remove the plastic bellows fitted on the new brake booster.

- Pull the short bellows off the old, removed brake booster (996 355 930 00) and the grommet (996 355 221 00). Use these parts for holding the second bellows off the push rod. If necessary (e.g. if damaged), replace the bellows and the grommet.

The previous second bellows (996 423 269 04) remain fitted on the body firewall. If necessary (e.g. if damaged), replace the bellows.

- Fit the previous short bellows (996 355 930 00) instead of the removed plastic bellows on the new brake booster.

- Fit the previous grommet (996 355 221 00) on the push rod of the new brake booster.

- Install the brake booster in the vehicle, as described in the Technical Manual, Group 4.

Literature:

911 Carrera (996) Technical Manual, Group 4 (Supplement 45):

> Repairs: 47 70 19 - Removing and installing brake booster.





DISCLAIMER