2052785-1
Service Bulletin Details
Public Details for: 2052785-1
Brake noise identification
- 2019 - 2018 - 2017 - 2016 - 2015 - 2014 - 2013 - 2012 - 2011 -
Models from 2018
2018 BENTLEY BENTAYGA |
2018 BENTLEY CONTINENTAL GT |
2018 BENTLEY FLYING SPUR |
2018 BENTLEY MULSANNE |
Models from 2017
2017 BENTLEY BENTAYGA |
2017 BENTLEY CONTINENTAL GT |
2017 BENTLEY FLYING SPUR |
2017 BENTLEY MULSANNE |
Models from 2013
2013 BENTLEY CONTINENTAL GT |
2013 BENTLEY MULSANNE |
Models from 2012
2012 BENTLEY CONTINENTAL GT |
2012 BENTLEY MULSANNE |
Models from 2011
2011 BENTLEY MULSANNE |
Technical product information Topic Market area Brand Transaction No. Level Status Release date Brake noise identification Bentley: worldwide (2WBE),Hongkong-Macau (5HK) Bentley 2052785/1 EH Approval New customer code Object of complaint Complaint type Position running gear -> brakes, brake control -> service brake noise, vibration -> noise Vehicle data New Continental GT Sales types Type MY Brand Designation Engine code Gearbox code Final drive code 3S3* 2018 E * * * 3S3* 2019 E * * * Mulsanne Sales types Type 3Y2* 3Y2* 3Y2* 3Y2* 3Y2* 3Y2* 3Y2* 3Y2* 3Y2* 3Y6* 3Y6* 3Y6* MY 2011 2012 2013 2014 2015 2016 2017 2018 2019 2017 2018 2019 Brand Designation Engine code Gearbox code E * * E * * E * * E * * E * * E * * E * * E * * E * * E * * E * * E * * Final drive code * * * * * * * * * * * * Bentayga Sales types Type MY Brand Designation Engine code Gearbox code Final drive code 4V1* 2017 E 4V1* 2018 E 4V1* 2019 E * * * * * * * * * Continental GT and Continental GTC Sales types Type 393* 393* 393* 393* 393* 393* 393* 394* MY 2012 2013 2014 2015 2016 2017 2018 2012 Brand Designation Engine code Gearbox code E * * E * * E * * E * * E * * E * * E * * E * * Final drive code * * * * * * * * 394* 394* 394* 394* 394* 394* 2013 2014 2015 2016 2017 2018 E E E E E E * * * * * * * * * * * * * * * * * * Flying Spur Sales types Type MY Brand Designation Engine code Gearbox code Final drive code 4W2* 4W2* 4W2* 4W2* 4W2* 2014 2015 2016 2017 2018 E E E E E Documents Document name master.xml brakenoisequestionnaire.xlsx flowchart.docx * * * * * * * * * * * * * * * Technical product information Brake noise identification Customer statement / workshop findings Customer statement: Noise complaint from the braking system. Workshop findings: The noise can be reproduced and clearly assigned to the braking system. Technical background Brake noises can be attributed to many causes. Eight of the most common causes are: 1. Brake discs or pads are close to their wear limit. 2. New brake pads and/or discs have not been properly bedded in after installation. 3. Aftermarket pads or discs are installed. 4. There is debris such as small stones, grit, road salt or sand between the brake disc and pad. 5. Discs are covered in rust. Rust can form when the vehicle has been stationary for long periods of time (Figure 1). Figure 1 6. Discs have a groove in them (Figure 2) Transaction No.: 2052785/1 Figure 2 7. There is chemical contamination on the braking surface of the disc due to a wheel or tyre cleaner being sprayed directly onto the disc (Figure 3). Figure 3 8. There are ‘pad marks’ on the brake disc as a result of the brake pad material transferring to the discs. This can occur when a vehicle has been stood for long periods of time in a wet or snowy environment (Figure 4). Figure 4 Production change * Measure Note: For correct diagnosis and repair the attached Flowchart must be followed. 1. Check the overall condition of the brakes to determine if the brake noise can be attributed to one of the causes listed in the Technical Background section of this TPI. If the noise is not a result of one these causes, proceed with point 2. 2. Record the noise and frequency For the frequency analysis and the noise recording we recommend using the Chassis Ear Tool WT 10437. To record the noise and measure the frequency using WT 10437 Chassis Ear Tool follow these instructions; Refer to ‘File recording’ in the WT 10437 user instructions. Using the microphone provided in the kit, record the noise from outside of the vehicle. If the noise is only replicable during a road test, the microphone still needs to be positioned outside of the cabin for the best results. The assistance of a second technician is required. WARNING Do NOT attempt to carry out the road test alone. The driver's concentration MUST be focused on the road at ALL times. WARNING Observe usual road safety procedures and speed limits. Select ‘FFT Graph’ as Wave Form Type and read the peak achieved during the recording as highlighted in the example above (in this case brake squeal peak frequency is 2000Hz). Save the file to your device. The sound recording/video can also be taken from a mobile telephone as long as the noise is clearly identifiable. If the noise cannot be reproduced a customer recording of the noise is also acceptable. 3. Check to see if a TPI is available that matches the customer complaint and recorded frequency. If there is an applicable TPI available, apply it and complete a DISS complaint to include ‘Workshop findings’ only (No repair query required). Should there be no applicable TPI, proceed with point 4. 4. Raise a DISS technical query. Both the completed ‘Brake noise questionnaire’ and the sound/video recording must be attached. Warranty accounting instructions Warranty claims about noise complaints caused by the brake system are only possible with a completed ‘Brake noise questionnaire’ and an audio/video recording. Noise complaint from braking system Visual check of braking system as per the Technical Background section of the TPI Not OK OK Follow standard repair procedures then retest for noise OK Use WT 10437 to create sound recording and record frequency TPI available? Yes No Raise a DISS technical query Attach the completed ‘Brake noise questionnaire’ Attach the sound/video recording Noise still present OK Repair as per TPI then retest for noise Noise rectified Noise rectified ddd Noise still present Vehicle is fixed Brake noise questionnaire Vehicle information: VIN: Road test: carried out: yes complaint confirmed: Noise type: no When does the noise occur: grinding judder squealing moaning creaking clonk rattle Where does the noise occur: Front axle yes forward backwards always slow down gently Hold (e.g. at traffic lights) 0-30 k.p.h. often slow down hard Curve 30-60 k.p.h. rare emergency stop very rare without brakes more than 60 k.p.h. Brake temperature: Free Text: Rear axle cold Frequency: Noise recording or video must be attached to the DISS or sent to Product Support Inbox kHz How long has the noise been occuring: Noise occurs only once in the same direction (repeatable moving back and forth): yes no Does the noise only occur after the vehicle has been stood: yes no If answered yes, how long was the vehicle stood for? Does the noise still occur after the brakes are applied several times: yes no Road conditions when the noise occurs: Smooth surface Rough surface Cobblestone Condition of the brake discs: Okay rusty hotspot Groove outside Groove inside Cracks tinged Sediments on the pad Brake pad wear (visual check): % Front % Rear Outside temperature: of 15 C° 20 to C° Weather: wet dry Snow Customer Driving profile: short haul Long haul sporty normal driven daily not driven daily parked outside parked inside other: Further information: (if necessary) Repeat repair: yes Previous repair information: no hot