No. 2119

Bulletin #: 2119
Advanced Technical Information
Part ID: 4653
4
9YA/9YB Cayenne – Brake Squeal due to Rear PSCB Corrosion
Vehicles Affected
Models
Model Year
Model Type
VIN Range
Vehicle-Specific Equipment
Cayenne
As of 2019
9YA
N/A
1ZI – PSCB Porsche Surface
Coated Brakes
Cayenne Coupe
As of 2020
9YB
N/A
1ZI – PSCB Porsche Surface
Coated Brakes
Revision History
Revision
Release Date
Changes
0
August 13, 2021
Original document
Condition
The customer complains of a brake squealing noise, often while the brakes are not being used. The frequency can be
measured in the range of 1-2 kHz and comes from the brakes on the rear axle.
Technical Background
Corrosion build-up on the inner surface of the brake bell can lead to excess
vibrations that cause a middle-frequency noise to be heard.
Figure 1 - Corrosion on inner surface of
brake bell
AfterSales
Aug 13, 2021
Page 1 of 3
Bulletin #: 2119
Advanced Technical Information
Part ID: 4653
4
Service Information
1. Document the noise with a video and FFT plot.
2. Replace the rear brake discs in accordance with workshop manual WM 465319 – Removing and installing 		
rear brake disc.
- Please use part number 9Y0.615.601.C (left) and 9Y0.615.602 (right).
- Note: All parts ordered after July 9, 2021 will be painted on the inner surface of the brake bell. This paint
prevents excessive corrosion build-up throughout the life of the brake disc.
Figure 2: Painted inner surface of brake bell
Warranty
As always, be sure to document the repair completely in PCSS.
For this repair, please code the “cause” as follows:
Cause location:
4653
Rear PSCB brake disc
Cause symptom:
2019
Squeaks
Use the following troubleshooting labor operation:
46532000 2 Brake discs rear remove and reinstall
AfterSales
Aug 13, 2021
Page 2 of 3
Bulletin #: 2119
Advanced Technical Information
Part ID: 4653
4
Search Items
Cayenne, Cayenne Coupe, 9YA, 9YB, brake squeal, PSCB, PSCB squeal
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are
written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in
order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and
may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester
are the ones that must be followed.
F11892
©2021 Porsche Cars North America, Inc.
AfterSales
Aug 13, 2021
Page 3 of 3