Advanced Technical Information
Brake Noise Reporting and Documentation

All

1603

4636

4

Binder – 4 --- Chassis

Vehicle Type:

All

Model Year:

All

Information:

Brake noise can vary greatly. The most common brake noise complaint is squeal.
The frequency range for brake squeal is large and the countermeasures necessary for different
frequencies are quite different. The result is that without accurate frequency measurements, it is
not possible to determine the appropriate countermeasure.
There are modern tools that are very easy to use to collect frequency and volume (measured in
Decibels, dB). It can even be easier than trying to get a video or sound recording.
The tool mentioned above is called a Spectrum Analyzer or a Fast Fourier Transform (FFT). It is
possible to download an app for a phone or tablet that accomplishes this task quite easily. A couple of examples are shown below.
The following spectrum analyzer app is for Android devices:

©2016 Porsche Cars North America, Inc.

AfterSales

Date: 2-16-16

Page 1 of 3

4

All
4636

Advanced Technical Information

1603
This app is for iPhone and iPad:

Date: 2-16-16
Page 2 of 3

AfterSales

©2016 Porsche Cars North America, Inc.

4

All

Advanced Technical Information

1603

4636

A couple of notes to help in the use of these apps:
• The volume level of the noise you are capturing (measured in dB) is critical in determining the severity of the noise. So it is best to capture this live, than to get it from a video (the volume of the computer playing the video will then determine the dB reading).
• Screen shots are sufficient, if you are able to freeze the screen and then put a cursor on the noise
so that the exact frequency and dB can be seen (like the second one above) that is extremely
helpful.
Please attach the screen shots to the PQIS job. We will then have a starting point to work from.

Dealership
Distribution
Routing

Service Manager_______ Service Specialist _______

_______

_______

_______

_______

_______

_______

________

Asst. Manager

_______

_______

_______

_______

_______

_______

________

_______ Service Specialist _______

Dr. Ing. h.c. F. Porsche AG is the owner of numerous trademarks, both registered and unregistered, including without limitation the Porsche Crest®, Porsche®, Boxster®, Carrera®, Cayenne®,
Cayman®, Macan®, Panamera®, Speedster®, Spyder®, 918 Spyder®, Tiptronic®, VarioCam®, PCM®, PDK®, 911®, RS®, 4S®, FOUR, UNCOMPROMISED®, and the model numbers andthe
distinctive shapes of the Porsche automobiles such as, the federally registered 911 and Boxster automobiles. The third party trademarks contained herein are the properties of their respective owners.
Porsche Cars North America, Inc. believes the specifications to be correct at the time of printing. Specifications, performance standards, standard equipment, options, and otherelements shown are
subject to change without notice. Some options may be unavailable when a car is built. Some vehicles may be shown with non-U.S. equipment. The information contained herein is for internal authorized
Porsche dealer use only and cannot be copied or distributed. Porsche recommends seat belt usage and observance of traffic laws at all times.

©2016 Porsche Cars North America, Inc.

AfterSales

Date: 2-16-16
Page 3 of 3