Service bulletins for the 1991 Porsche 911
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.
92 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Brakes are shown. Show all
| No. 1801.4 | 2022-04-05. Service bulletin. SERVICE BRAKES. Advanced technical information for a brake squeal. |
|---|---|
| ATIALL41605 | 2021-06-28. Service bulletin. EQUIPMENT; SERVICE BRAKES. Understanding and addressing brake squeal complaints. |
| 122-L5E2R-04 | 2018-04-23. Service bulletin. SERVICE BRAKES, HYDRAULIC. Subject: Replacing brake booster during repairs Information: If the brake booster on the 911 Carrera 2/Targa/Speedster (964) needs to be replaced, the replacment brake booster will be a 911 (993) version. During conversion, the brake master cylinder, mounting saddle and (push rod) joint screw must be replaced (? Figure 1). The power steering pressure and return linesmay also have to be replaced. |
| GRP4/9310 | 1995-11-01. Service bulletin. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS. BRAKE VIBRATION DAMPER APPLICATION - NEW DAMPING PLATE WITH STEEL CLIP. *TW |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.