B340613

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SI B34 06 13
Brakes
July 2016
Technical Service
Brake Disc and Brake Pad Service and Reference Information
New information provided by this revision is preceded by this symbol
.
This Service Information bulletin supersedes SI 34 06 13 dated March 2015.
MODEL
All except M vehicles
SITUATION
Determining when to service brake components
INFORMATION
1. Brake Noise
Most brake squeal 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 build up
of debris on brake components.
Submit a PuMA Info Only case when
servicing the vehicle for a customer
complaint of brake noise.
Include in the case:
z
Identifying the correct axle
z
Photos of the pads, discs and
calipers
z
Sound recording/video of noise
occurring
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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
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 surfaces
Brake disc friction surfaces are
exposed metal. When not in use and
exposed to environmental elements
(moisture, salt, dirt), surface rust can
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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
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.
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.
Significantly stained
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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
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
Always refer to the Repair
Manual for model-specific
information.
z
Always replace discs in pairs
(per axle).
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z
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.
This initial “bedding in” is important to
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the brake component cosmetics and
overall service life.
8. Minimum Thickness
BMW 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
the measurement of 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 (not applicable to perforated
brake discs and M vehicles)
NOTE:
z
Always refer to the Repair
Manual for model-specific
information.
z
Always replace discs in pairs
(per axle).
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z
Install new brake pads when
replacing discs.
Attach the hang tag to the inside
rearview mirror after completion of
repair work.
9.
Brake-induced Vibration
Brake
disc
thickness
variation
is the
result of
lateral
runout in
the face
of the
brake
disc.
A brake
disc with
lateral
runout
while
driving
will
slightly
contact
the brake
pad once
per
revolution
resulting
in a thin
spot on
the brake
disc.
This
consistent
contact
will
eventually
cause the
brake disc
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to wear
unevenly.
Refer to
SI B34 01
14
10. Brake Overheating
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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:
z
Always refer to the
Repair Manual for
model-specific
information.
z
Always replace discs
in pairs (per axle).
z
Install new brake
pads when replacing
discs.
z
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 BMW New Vehicle Limited Warranty for Passenger Cars
and Light Trucks.
Front Axle
Defect Code:
34 00 01 39 00
Front axle brakes - Squeaking
Labor Operation:
Labor Allowance:
Description:
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34 10 059
Refer to KSD2
Cleaning both front wheel
brakes (Main work)
1 FRU
Work time to chamfer front pads
and
34 99 000
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
Rear axle brakes - Squeaking
Labor Operation:
Labor Allowance:
Description:
34 10 069
Refer to KSD2
Cleaning and adjusting both rear wheel
brakes (Main work)
1 FRU
Work time to chamfer rear pads
and
34 99 000
If you are using a Main labor code for another repair, use the Plus code labor operation 34 10 569
instead.
Front and Rear Axles
Front and rear axle brakes Squeaking
Defect Code:
34 00 20 39 00
Labor Operation:
Labor Allowance:
Description:
34 10 079
Refer to KSD2
Cleaning and adjusting all
brakes of all wheels (Main work)
2 FRU
Work time to chamfer front and rear
brake 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.
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ATTACHMENTS
View PDF attachment B340613_Technician_Rotor_Measuring_Sheet.
[ Copyright ©2016 BMW of North America, Inc. ]
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