# Service bulletin No. 4\-23

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.

- Type: Service bulletin
- NHTSA id: 10237350
- Published by NHTSA: 2023\-06\-05
- Manufacturer's number: No. 4\-23
- Manufacturer's date: 2023\-05\-01
- NHTSA component: SERVICE BRAKES; EQUIPMENT

## NHTSA's summary

Technical information on WPA1 \- reworking brake line threading for the Boxster, Cayman, and 911

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10237350-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10237350-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Equipment and accessories

## Vehicles listed

- 2022 to 2023 PORSCHE 718 BOXSTER
- 2023 PORSCHE 718 CAYMAN
- 2022 to 2023 PORSCHE 911
- 2022 PORSCHE redundant CAYMAN

## Other bulletins for the same vehicles and component

- [GR13D800](/bulletins/11035892.md), 2026-08-05, Service bulletin: SERVICE BRAKES. Parts Withdrawal \- 1 Set of Brake Pads for Disk Brake
- [GR13D798](/bulletins/11035890.md), 2026-08-05, Service bulletin: SERVICE BRAKES. Parts Withdrawal \- Brake Disc
- [No. 2309.3](/bulletins/11032392.md), 2026-05-07, Service bulletin: ELECTRICAL SYSTEM; SERVICE BRAKES. Instructions on advanced technical information for 718 GTS 4.0 \- Brake Booster \(Power Brake\) Warning in Instrument Cluster
- [No. D752](/bulletins/11028352.md), 2026-02-05, Service bulletin: SERVICE BRAKES. Parts information for parts withdrawal involving the caliper without brake pads. The part numbers affected are in the attached PDF. The vehicles associated are cars that use the part numbers in the PDF.
- [No. D749](/bulletins/11026376.md), 2025-12-05, Service bulletin: SERVICE BRAKES. Parts information for parts withdrawal involving the brake disc 9Y0615301AJ
- [No. 31\-25](/bulletins/11021353.md), 2025-08-04, Service bulletin: SERVICE BRAKES. Technical information for a complaint Maneuvering Assistant: Implausible Standstill When Reversing
- [D719](/bulletins/11018757.md), 2025-06-02, Service bulletin: SERVICE BRAKES. Parts information for Parts Withdrawal \- 1 Set of Brake Pads for Disk Brake. Vehicles included are all cars that use part number 992698451R
- [No. 16\-25](/bulletins/11018005.md), 2025-05-06, Service bulletin: SERVICE BRAKES. Symptom based workshop manual for a yellow warning message \- parking brake malfunction in the instrument cluster
- [No. 214\-21](/bulletins/11006852.md), 2024-09-04, Service bulletin: SERVICE BRAKES. Technical information on a complaint \- brake rubbing/floating pedal pressure point/high wear on brake pads and discs/lateral runout of brake disc. replacing brake pads with race track pads
- [No. 214\-21](/bulletins/11005796.md), 2024-08-06, Service bulletin: SERVICE BRAKES. Technical information for a complaint regarding the brake rubbing/floating pedal pressure point/high wear on brake pads and discs/lateral runout of brake disc. Replace brake pads with race track pads

JSON: [/v1/bulletins/10237350](/v1/bulletins/10237350)

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