NHTSA ID Number: 10177623
Manufacturer Communication Number: B340320
TSB/Document Date: 2020-07-27
Summary
PREMATURE WEAR OF THE REAR AXLE BRAKE PADS WITH STANDARD BRAKES: The CBS data and Check Control (CC) message shows the rear axle brake pads are worn, and the vehicle has less than 15,500 miles. Increased residual braking forces in the rear axle brake calipers caused by production-related deviations on the surface of the piston ring seal.
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TSB/Document ID: B340320
Replacement Service Bulletin Number:
MFR Communication Date: 2020-06-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
7/6/2020
34 03 20_PREMATURE WEAR OF THE REAR AXLE BRAKE PADS WITH STANDARD BRAKES
SIB 34 03 20
PREMATURE WEAR OF THE REAR AXLE BRAKE PADS WITH
STANDARD BRAKES
2020-06-02
MODEL
E-Series
Model
Description
G20
3 Series Sedan
G29
Z4 Roadster
Production Date
November 1, 2018 to December 31,
2019
November 1, 2018 to December 31,
2019
Affected Option
Code
Standard brakes
Standard brakes
SITUATION
The CBS data and Check Control (CC) message shows the rear axle brake pads are worn, and the vehicle
has less than 15,500 miles.
CAUSE
Increased residual braking forces in the rear axle brake calipers caused by production-related deviations on
the surface of the piston ring seal.
CORRECTION
Improved rear axle brake calipers.
PROCEDURE
1. Is the rear axle brake pad wear indicator and the CBS data display showing worn rear brake pads
(service due)?
Yes, proceed to next step
No, no further action required
2. Does the vehicle have under 15,500 miles or does the rear brake pads have under 15,500 accumulated
miles since the last replacement?
Yes, proceed to next step
No, replace brake pads under maintenance program or as customer pay as applicable
3. Replace both rear axle brake calipers as per REP 34 21 745* “Removing and installing/replacing rear left
or right brake caliper”. Install new pads and wear sensor.
* NOTE: The model G30 must be used when searching the repair instruction. Repair instructions are not
currently available in ISTA or AIR for G20.
PARTS INFORMATION
Obtain and confirm the part numbers for your specific vehicle by entering the chassis number in either ETK
or AIR which takes into account specific equipment and/or options.
For 330i, 330i xDrive; and Z4 sDrive30i
Part Number
Description
34 20 8 836 841
Caliper housing left
34 20 8 836 842
Caliper housing right
Refer to ETK
Repair kit, brake pads asbestos-free
Refer to ETK
Brake pad wear sensor, rear
81 22 0 142 156
Brake fluid (12 oz btl)
Quantity
1
1
1
1
As needed
Copyright ©2020 BMW
of North America, Inc.
1/3
7/6/2020
34 03 20_PREMATURE WEAR OF THE REAR AXLE BRAKE PADS WITH STANDARD BRAKES
For M340i, M340ix and Z4 M40i
Part Number
Description
34 20 8 836 845
Caliper housing left
34 20 8 836 846
Caliper housing right
Refer to ETK
Repair kit, brake pads asbestos-free
Refer to ETK
Brake pad wear sensor, rear
81 22 0 142 156
Brake fluid (12 oz btl)
Quantity
1
1
1
1
As needed
And:
Bulk Material - Sublet
Part Number
83 12 2 296 187
Description
Brake Pad Paste - 5 ml
Quantity
1
WARRANTY INFORMATION
For those vehicles with an “active” maintenance program, when the repair outlined in the Procedure section
applies and is performed, this repair will address and replace the following maintenance service tasks:
Rear brakes service (Pads are due with under 15,500 miles accumulated); and the
Brake fluid service (When it shows Recommended, Due or Bundling Eligible)
Please be sure to explain on the repair order and in the claim comments for the Standard Scope line item
that one or both of the maintenance service tasks listed above were addressed by performing the repair
outlined in this Service Information Bulletin.
If any additional required maintenance service tasks are required and performed, when eligible, claim these
items normally and reset the CBS data.
Defect Code:
3421022900
Brake pad, rear jammed/stuck
As outlined in the Procedure section (Step 2, Yes) and in conjunction with the above, rear caliper
replacement is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and
Light Trucks.
Labor Operation
34 00 506
And:
34 21 755
Description
Venting brake system (Plus work)
Labor Allowance
Refer to AIR
Replacing both rear axle brake calipers (including the
brake pads)
Refer to AIR
Replacing both rear axle brake calipers (including the
brake pads) (Wheels removed)
Refer to AIR
Or:
34 21 760
Refer to AIR for the corresponding flat rate unit (FRU) allowances.
Please also follow the Technical Data information and applicable Service Information Bulletins for rear brake
discs inspection and servicing with the replacement of the brake pads.
And, as needed:
Sublet – Bulk Materials (RO and Claim Comments Required)
Copyright ©2020 BMW of North America, Inc.
2/3
7/6/2020
34 03 20_PREMATURE WEAR OF THE REAR AXLE BRAKE PADS WITH STANDARD BRAKES
Sublet See the sublet
Code reimbursement
4
calculations below
Reimbursement for the repair-related bulk material (Do not use the
BMW part numbers for claim submission)
Sublet reimbursement calculation for claiming the applicable repair-related bulk material (BMW part
numbers) is at the dealer net price amount for the quantity used plus your center’s handling.
Enter this material cost in sublet and itemize the amount on the repair order and in claim comment section.
Copyright ©2020 BMW of North America, Inc.
3/3
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