# Service bulletin 122\-C4M9S\-09

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: 10148778
- Published by NHTSA: 2018\-11\-19
- Manufacturer's number: 122\-C4M9S\-09
- Manufacturer's date: 2018\-08\-17
- NHTSA component: SERVICE BRAKES, HYDRAULIC

## NHTSA's summary

Subject: Rear disc brake pads Symptom: If the vehicle is braked while driving at low speeds, a squealing noise can be heard shortly before the vehicle comes to a standstill. Cause: The disc brake pads can cause the squealing noise due to a change in the manufacturing process used by the supplier.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10148778-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10148778-0001.pdf)

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

## Components

Brakes

## Vehicles listed

- 2018 PORSCHE CAYENNE

## Other bulletins for the same vehicles and component

- [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
- [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. D689](/bulletins/11005786.md), 2024-08-06, Service bulletin: SERVICE BRAKES. Parts information for parts withdrawal involving the brake hose 9J1611707F and 9J1611708F
- [No. D684](/bulletins/11002860.md), 2024-07-02, Service bulletin: SERVICE BRAKES. Parts information for parts withdrawal involving the retainer for brake hose/brake line
- [No. D681](/bulletins/11001069.md), 2024-06-05, Service bulletin: SERVICE BRAKES. Parts information for parts withdrawal involving the retainer for brake hose/pressure difference sender. \(9J1611845C, 9J1611846C, PAB906051C\)
- [No. 122\-20](/bulletins/10233885.md), 2023-04-06, Service bulletin: SERVICE BRAKES, HYDRAULIC. Technical information on a complaint \- brake noise
- [No. 120\-22](/bulletins/10222394.md), 2022-10-04, Service bulletin: SERVICE BRAKES, HYDRAULIC. Symptom\-based workshop manual for the PSCB brake system. Squeaking noises from around the front axle. Replacing brake discs and brake pads.
- [No. 1801.4](/bulletins/10209901.md), 2022-04-05, Service bulletin: SERVICE BRAKES. Advanced technical information for a brake squeal.
- [No. 111\-20](/bulletins/10203089.md), 2021-11-05, Service bulletin: SERVICE BRAKES, HYDRAULIC. Information on symptom\-based workshop manual. Disc brakes \- squealing noises at low speed from rear axle area.

JSON: [/v1/bulletins/10148778](/v1/bulletins/10148778)

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