# Service bulletin GRP4/9506

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: 46404
- Published by NHTSA: 1996\-04\-25
- Manufacturer's number: GRP4/9506
- Manufacturer's date: 1995\-11\-01
- NHTSA component: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

## NHTSA's summary

EXCESSIVE OPERATING NOISE FROM THE HYDRAULIC BRAKE BOOSTER PUMP. TO REDUCE THE OPERATING NOISE FROM THE HYDRAULIC BRAKE BOOSTER PUMP, A DAMPER \(ARROW, FIGURE 1\) CAN BE INSTALLED BETWEEN THE PUMP AND THE BRAKE SYSTEM ACCUMULATOR.

## 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

- 1996 PORSCHE 911
- 1996 PORSCHE CARRERA

## Other bulletins for the same vehicles and component

- [No. 1801.4](/bulletins/10209901.md), 2022-04-05, Service bulletin: SERVICE BRAKES. Advanced technical information for a brake squeal.
- [ATIALL41605](/bulletins/10198525.md), 2021-06-28, Service bulletin: EQUIPMENT; SERVICE BRAKES. Understanding and addressing brake squeal complaints.
- [122\-S6Q2R\-06](/bulletins/10188291.md), 2021-03-06, Service bulletin: EQUIPMENT; SERVICE BRAKES. Resubmitting at request of Mr. Bernard Hardgrave. Advanced technical information on brake fluid for all Porsche vehicles.

JSON: [/v1/bulletins/46404](/v1/bulletins/46404)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20GRP4%2F9506&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F46404&vehicle=Service%20bulletin%20GRP4%2F9506)