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Service bulletin 4650

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 id635586
Published by NHTSA2002-10-25
Manufacturer's number4650
Manufacturer's date2002-07-22
NHTSA componentSERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC

NHTSA's summary

CONCERNS WITH CORROSION ON THE BRAKE DISCS. *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 (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. 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.
44702002-10-29. Service bulletin. BRAKE BOSTER SEALT REPLACEMENT AT THE FIREWALL. CORRECTIONS. *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
24542000-04-10. Service bulletin. RECOMMENDED PROCEDURES WHEN WORKING WITH VACUUM LINES AND HOSES. YD