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Service bulletin 4470

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id635612
Published by NHTSA2002-10-29
Manufacturer's number4470
Manufacturer's date2002-08-01
Replaces4470
NHTSA componentSERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

NHTSA's summary

BRAKE BOSTER SEALT REPLACEMENT AT THE FIREWALL. CORRECTIONS. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Brakes

Vehicles listed
PORSCHE 911 CARRERA1999, 2000 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
No. D6892024-08-06. Service bulletin. Parts information for parts withdrawal involving the brake hose 9J1611707F and 9J1611708F
No. D6842024-07-02. Service bulletin. Parts information for parts withdrawal involving the retainer for brake hose/brake line
No. D6812024-06-05. Service bulletin. Parts information for parts withdrawal involving the retainer for brake hose/pressure difference sender. (9J1611845C, 9J1611846C, PAB906051C)
No. 24032024-04-03. Service bulletin. Special tools and equipment information for brake caliper pins for the 911, Boxster, and Cayman
No. 1801.42022-04-05. Service bulletin. Advanced technical information for a brake squeal.
ATIALL416052021-06-28. Service bulletin. Understanding and addressing brake squeal complaints.
122-S6Q2R-062021-03-06. Service bulletin. Resubmitting at request of Mr. Bernard Hardgrave. Advanced technical information on brake fluid for all Porsche vehicles.
46502002-10-25. Service bulletin. CONCERNS WITH CORROSION ON THE BRAKE DISCS. *TT
11012002-07-15. Service bulletin. TECHNICAL INFORMATION REGARDING BRAKE BOOSTER SEAL AT THE FIREWALL WHICH HAS CHANGED. *TT
46052000-04-11. Service bulletin. SQUEAKING OR CLICKING NOISES CAN OCCURE WHEN THE BRAKE OR CLUTCH PEDALS ARE OPERATED. YD