NHTSA ID Number: 10149398
Manufacturer Communication Number: M340114
TSB/Document Date: 2018-11-26
Summary
Brake Disc and Brake Pad Service and Reference Information. Pads and/or discs are worn below minimum thickness. Replace the worn brake parts. If the service is performed, refer to the Warranty information.
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SI M34 01 14
Brakes
October 2014
Technical Service
SUBJECT
Brake Disc and Brake Pad Service and Reference Information
MODEL
All
SITUATION
Determining when to service brake components
INFORMATION
1. Brake Noise
Most brake squealing/noise is
produced by vibration of the brake
components. This vibration/oscillation
will build up a resonance which is
heard as a brake squeal.
The type and occurrence of this noise
varies, based on driving profile,
environmental conditions, and buildup
of debris on brake components.
Submit a PuMA Info Only case when
servicing the vehicle for a brake noise
customer complaint.
Include the following in the case:
z
z
z
Identifying the correct axle
Photos of the pads, discs and
calipers
Sound recording/video of the
noise occurring
Refer to the ISTA Repair Manual (by
model) for brake service, diagnostic
hints and proper lubrication points.
Remove the buildup of pad material by
carefully chamfering the edges all
around the brake pads, using a file.
Do not perform this repair if the brake
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pads and/or discs are worn below
minimum thickness.
Replace the worn brake parts.
If the service is performed, refer to the
Warranty information.
Examples of components that do not need to be replaced, including cosmetic guidelines:
2. NAO-specific color transfer since 2009 introduction
Non-asbestos Organic (NAO) brake
pad material, by design, reduces brake
dust and may generate a visible dark
transfer layer between pads and discs.
This behavior is specific to the stateof-the-art technology found in NAO
pad material.
The pad compound incorporates
nonferrous metal, which can affect the
appearance of the brake discs.
Color transfer on friction surfaces:
With heavy or extreme braking, color
transfer to the disc from the pads is
intensified and may generate dark
spots or circular traces. Normal
braking will gradually reduce the
discoloration.
This will not affect braking
performance.
No repair attempt is needed.
3. Light rust on friction surface
Brake disc friction surfaces are
exposed metal. When not in use and
exposed to environmental elements
(moisture, salt, dirt), surface rust can
form. During initial braking, this will
self-clean and an audible groan and/or
noise is temporarily heard until the
disc surface is cleaned.
This will not affect braking
performance.
No repair attempt is needed.
4. Stained spots/corrosion
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Slightly stained
Slight traces of corrosion on the brake
disc friction ring (remains of stained
spots): This is the normal condition of
a vehicle that is stationary and has not
been in use.
This corrosion varies with ambient
elements.
The appearance will not affect braking
performance and will diminish with
everyday use.
No repair attempt is needed.
Significantly stained
Significant signs of corrosion on the
friction ring: This is the normal
condition of a vehicle that is stationary
and has not been in use.
This corrosion varies with ambient
elements.
The appearance will not affect braking
performance and will diminish with
everyday use.
No repair attempt is needed.
5. Grooves
Grooves are formed when debris is
trapped between the pad and the disc.
Debris entry is inherent in the disc
brake cooling design. Current wheel
styling exposes more of the brake
components.
Grooves in the brake discs can be seen
through these wheel openings and are
purely visual; this in no way affects
braking performance.
No repair attempt is needed.
However, the groove depth must be
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evaluated to determine if replacement
is necessary.
If the groove’s or grooves’ depth goes
beyond the minimum thickness, disc
replacement is necessary.
NOTE:
z
z
z
Always refer to the Repair
Manual for model-specific
information.
Always replace discs in pairs
(per axle).
Install new brake pads when
replacing discs.
Attach a hang tag to the inside
rearview mirror after completion of
repair work.
6. Embedded material in brake pad
Improper “bedding in” of the new
brake pads and discs can cause the
rotor material to flake off. This debris
can become lodged in the pads and
cause this appearance.
This appearance will not affect braking
performance.
No repair attempt is needed
7. Customer notification
A hang tag can be found in the box of
new brake pads. It is advisable to make
extra copies for explanation to the
customer.
Attach the hang tag to the inside
rearview mirror after completion of the
repair work.
Advise the customer to avoid extreme
braking for the first 125 miles.
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This initial “bedding in” is important
for the brake component cosmetics and
overall service life.
8. Minimum thickness
MINI
brake discs are stamped with a
minimum thickness value. The
stamped minimum thickness is used to
determine if the brake discs require
replacement during a brake service.
Some motor vehicle inspection
procedures (state-dependent) require
measurement of the brake discs for
safety consideration. A separate
minimum thickness specification is
provided in the Repair Manual.
An example of the specifications is
described below.
The Minimum Thickness for general
inspection (Motor Vehicle Inspection)
is defined as follows:
z
New disc thickness minus 2.4
mm
NOTE:
z
z
z
Always refer to the Repair
Manual for model-specific
information.
Always replace discs in pairs
(per axle).
Install new brake pads when
replacing discs.
Attach the hang tag to the inside
rearview mirror after completion of
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repair work.
9. Brake-induced vibration
Using a micrometer (gauge precision
1/1000 mm), measure the brake disc
thickness.
Measure the surface within the brake
pad contact area.
The thickness difference is measured
with a micrometer at 8 points around
the braking surface.
The thickness difference of the brake
disc is maximum 0.020 mm.
If readings deviate beyond 0.020 mm,
replace the brake discs.
10. Brake overheating
Discoloration and/or visible hard spots
indicate brakes that have overheated.
Inspect the brake components for
error-free operation (calipers binding,
hydraulic restrictions, etc.).
If no mechanical/hydraulic defects are
found, this can be attributed to
improper brake usage. In this case, the
discs have to be replaced (not under
warranty).
NOTE:
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z
z
z
z
Always refer to the Repair
Manual for model-specific
information.
Always replace discs in pairs
(per axle).
Install new brake pads when
replacing discs.
Attach the hang tag to the inside
rearview mirror after completion
of repair work.
WARRANTY INFORMATION
Item #1 Brake Noise – Chamfering Brake Pad Portion Only
Covered under the terms of the MINI New Passenger Car Limited Warranty.
Front axle
Defect Code:
34 00 01 39 00
Labor Operation:
Labor Allowance:
Description:
34 10 059
Refer to KSD2
Cleaning both front wheel brakes
1 FRU
Work time to chamfer front pads
and
34 99 000
Labor operation code 34 10 059 is a Main labor operation. If you are using a Main labor code for another repair,
use the Plus code labor operation 34 10 559 instead.
Rear axle
Defect Code:
34 00 11 39 00
Labor Operation:
Labor Allowance:
Description:
34 10 069
Refer to KSD2
Cleaning and adjusting both rear wheel
brakes
1 FRU
Work time to chamfer rear pads
and
34 99 000
Labor operation code 34 10 069 is a Main labor operation. If you are using a Main labor code for another repair,
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use the Plus code labor operation 34 10 569 instead.
Front and Rear Axles
Defect Code:
34 00 20 39 00
Front and rear axle brakes squeaking
Labor Operation:
Labor Allowance:
Description:
34 10 079
Refer to KSD2
Cleaning and adjusting all brakes of all
wheels
2 FRU
Work time to chamfer front and rear
pads
and
34 99 000
Labor operation code 34 10 079 is a Main labor operation. If you are using a Main labor code for another repair,
use the Plus code labor operation 34 10 579 instead.
Even though work time labor operation code 34 99 000 ends in “000,” it is not considered a Main labor operation.
Also, since the “work time” FRU allowance to be claimed is specified, a separate punch time is not required.
[ Copyright ©2014 BMW of North America, Inc. ]
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- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: M340114
Replacement Service Bulletin Number:
MFR Communication Date: 2014-10-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
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