Brake Noise (Squealing)

Information 

The noise complaint must be documented as follows.

Recreate the driving situation in which the noise occurs and repeat this several times if possible. Choose the quietest area possible to do this.

• At speeds < 10 km/h (6 mph) - Record the noise from outside and capture the brake that is causing the noise in the picture
• At speeds > 10 km/h (6 mph) - Record the noise from inside and capture the speedometer in the picture

File name of the video: Quality line ID_Vehicle_Noise_DDMMYYYY

e.g.: 2200123456_911 Carrera_Squealing_26082020

Work Procedure: 

Information 

First classify the noise using the sound file. You will find this under "4636 - Sound file for TI (122/20)" in the information medium TI - Technical Information, Main group 4 - Chassis.

If the noise is not a squealing noise, continue with > Cold brakes  .

Squealing 

Create vehicle analysis log (VAL), reproduce the noise and record it on video.

Can the squealing noise be confirmed and is this the noise the customer complained about?

Yes	No
Check wear condition of the brake pads, see

> WM, 463602 CHECKING THICKNESS OF FRONT BRAKE PADS 

> WM, 463456 REPLACING FRONT PCCB BRAKE PADS 

> WM, 463802 CHECKING THICKNESS OF REAR BRAKE PADS 

> WM, 463556 REPLACING REAR PCCB BRAKE PADS 

The brake pads are > 50% worn or the brake pad or disc shows signs of damage, continue with Step  1. If the wear condition is unobtrusive: Make meaningful documentation of the noise with sound and video material in PQIS. Reference Group 4 ATI 1801 Brake Squeal for additional measures to address the squealing noises. If no remedial action is available and there is no technical defect in the brake system, explain the technical situation to customers with the help of the Driver's Manual of the vehicle (section: Brakes - Footbrake - Brake pads and brake discs).  If necessary, contact Technical Support in order to agree on how to proceed.

Continue as required for the detected noise, using the sound file to classify it. See 3D Information.

1. Replace brake pads, see

   > 463656 REPLACING FRONT BRAKE DISC PADS 

   > 463456 REPLACING FRONT PCCB BRAKE PADS 

   > 463856 REPLACING REAR DISC BRAKE PADS 

   > 463556 REPLACING REAR PCCB BRAKE PADS .

2. Check brake discs and replace them if necessary, see

   > 465002 CHECKING FRONT BRAKE DISCS (WEAR ASSESSMENT) 

   > 465102 CHECKING FRONT PCCB BRAKE DISCS (WEAR ASSESSMENT) 

   > 465302 CHECKING REAR BRAKE DISCS (WEAR ASSESSMENT) 

   and

   > 465402 PCCB - CHECKING REAR BRAKE DISCS (WEAR ASSESSMENT) 

   > 465019 REMOVING AND INSTALLING FRONT BRAKE DISC 

   > 465119 REMOVING AND INSTALLING FRONT PCCB BRAKE DISC 

   > 465319 REMOVING AND INSTALLING REAR BRAKE DISC 

   > WM, 465419 REMOVING AND INSTALLING REAR PCCB BRAKE DISC 

3D Information: 

For better classification of the noises, use the sound file/video under the following link.

> TIGHTENING TORQUES FOR BRAKE MECHANISM