Talking To Customers

Work Procedure: 

1. When talking to customers, ask about the operating conditions in which the noise occurs:
   • Are the brakes warm or cold?
   • Weather conditions dry or wet?
   • Outside temperature warm or cold?
   • Slight or hard braking?
   • Slow, normal or sporty driving?

   Information 

   • A groaning noise and creaking can be heard when the brakes are pressed slightly when the vehicle is nearly at a standstill, e.g. when maneuvering or parking. These noises do not occur when driving normally. 
   • The groaning/creaking increases when driving on gradients, in wet conditions and in Sport+ drive mode as well as at low temperatures. 
   • Squealing can occur in all driving situations. 
   • Other brake noises may be scraping or clicking. 

   Braking noise	Conditions of occurrence
   Groaning/creaking	A groaning noise and creaking can be heard when the brakes are pressed lightly when the vehicle is nearly at a standstill, e.g. when maneuvering or parking. These noises usually do not occur during normal driving. Slopes, wetness and Sport+ driving mode as well as low temperatures increase a groaning/creaking.
   Squealing	Slopes, wetness and Sport+ driving mode as well as low temperatures increase a squealing.
   Scraping/chipping	Usually occurs on PCCB brake systems when the brake is actuated shortly in front of the vehicle. Slight actuation of the brake can promote scraping/chipping.

   For better classification of the noises, see 3D information  .

2. Classification of customer description and deriving possible action:

   The brake noise occurs shortly before the vehicle comes to a standstill or while creeping at slow speeds, usually when the brakes are cold (groaning or creaking):

   Continue with > Cold brakes  .

   The brake noise is generally  produced shortly before a standstill when the brake is warm and the vehicle has a PCCB brake system (scraping or chipping):

   Continue with > brake noise (scraping/chipping)  .

   The brake noise occurs in every driving situation (squealing):

   Continue with > Warm brakes  .

   The brake noise cannot be assigned to any of the noises specified above:

   Continue with > Other brake noises  .

3D Information: 

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

> TIGHTENING TORQUES FOR BRAKE MECHANISM