2046299-4

Technical Service Bulletin
Topic
Market area
Brand
Transaction No.
Level
Status
Release date
Bentayga - 1.2 - 1.4KHz rear brake squeal
Bentley: worldwide (2WBE),Hongkong-Macau (5HK)
Bentley
2046299/4
EH
Released for publishing
May 20, 2019
New customer code
Object of complaint
Complaint type
Position
chassis -> brakes, brake regulation -> foot brake noises, vibrations -> noise
New workshop code
Object of complaint
Complaint type
Position
chassis -> brake system -> brake pads (disc brake) noises, vibrations -> noise left rear
chassis -> brake system -> brake pads (disc brake) noises, vibrations -> noise right rear
Vehicle data
Bentayga
Sales types
Type
4V1*
4V1*
4V1*
4V1*
MY
2017
2018
2019
2020
Brand Designation Engine code Gearbox code
E
*
*
E
*
*
E
*
*
E
*
*
Documents
Document name
master.xml
Final drive code
*
*
*
*
Technical Service Bulletin
Bentayga - 1.2 - 1.4KHz rear brake squeal
Transaction No.: 2046299/4
Release date: May 20, 2019
Condition
Squeal from the rear of the vehicle at low speed while braking.
Technical Background
While braking at low speed, a vibration of 1.2 to 1.4 KHz can be produced by the friction between the rear brake pad and disc resulting in a complaint
of brake noise from the customer
Production Solution
-
Service
1) Follow the ‘Brake noise identification’ TPI 2052785 - IMPORTANT: For frequency analysis the noise recording equipment Bentley Motors
recommends is the Chassis ear tool WT 10437
2) If the sound recording produces a frequency of 1.2-1.4KHz, fit the shim set 36A 698 219 to the rear brake pads (the kit consists of one shim per
pad)
NOTE: G052 560 A2 “Vary Bond Regular Grade Grease”(100 gram tube) is also required to be used in conjunction with the shims
3) Remove the rear brake pads as per Repair manual Rep.Gr 46 - Rear Brake Pads - To Remove and Fit and check the actual condition of the brake
pads - If the brake pads are to be refitted it will be necessary to make note of the position of the pads for installation purposes.
CAUTION: The performance of the car will be affected if the brake pads are installed in the incorrect position
If new brake pads are required, photographic evidence of the pad thicknesses and the back plate of the pads must be supplied
through a DISS technical query.
IMPORTANT: The following instructions regarding grease application must also be followed regardless if the brake pads are to be replaced or
renewed
4) Carefully clean the back plate of the pad using a suitable brake cleaner IMPORTANT: Take care not to damage the rubber on the bonded shim
NOTE: In the event that the rubber is damaged from contact with the piston and there are loose rubber parts, it would be advised to fit new brake
pads.
5) The next step is to install one shim from the shim kit 36A 698 219 to each rear brake pad, ensuring that when fitted the new shim is seated flat
against the brake pad bonded shim
6) Referring to Figure 1 - Apply 6 dots of grease (< 1.0g in total) to the inside face of the clip on shim
Figure 1
•
Referring to Figure 2 – Using a suitable spatula spread the grease to an even layer condition
Figure 2
7) Assemble the clip-on shim onto the pad - Squeeze together firmly to remove any excess grease which comes out from between the new shim and
the brake pad bonded shim NOTE: Ensure the new shim is seated flat against the brake pad bonded shim
•
Referring to Figures 3 and 4 Clean the pad abutments & the spring clips, then apply a small dot of grease to them
Figure 3
Figure 4
8) Clean the pad abutment faces on the calliper carrier – scrape off any dirt and brake dust which has accumulated, then use a suitable brake cleaner
9) Wipe the face of the piston to remove any brake dust or dirt.
•
Refit the rear brake pads as per Repair manual Rep.Gr 46 - Rear Brake Pads - To Remove and Fit, taking care not to dis-lodge the grease/shims
before the pads are in position.
•
Test Drive the vehicle and verify if the noise is no longer evident, If new pads have been fitted follow the Measure section of the ‘Brake Bedding
Procedure’ TPI 2039982
10) On return from road test, visually check for any excess grease which may have come out from between the two shims and remove with suitable
cleaner.
Required Parts and Tools
Part number
Description
Quantity
36A 698 219
Shim set for rear brake pads
1
G 052 560 A2
Vary Bond grease
1 = 1 x 100 gram tube
Do not order x1 tube of grease for each individual vehicle as the grease must be used on multiple vehicles (minimum of three vehicles
per tube)