B341017

TIS Service Bulletin
Page 1 of 3
SI B34 10 17
Brakes
April 2017
Technical Service
LOW-SPEED BRAKE SQUEAL
New information provided by this revision is preceded by this symbol
.
This Service Information bulletin replaces SI B34 10 17 dated October 2017
What’s New:
• Production range added
• Procedure – Identify brake carrier part number
• Part numbers changed
MODEL
G30 (5 Series Sedan)
From Start of
Production up to
11/30/17
SITUATION
Vehicle brakes produce a squealing noise when applied at low speed.
CAUSE
Guide pin on the rear brake caliper bracket.
CORRECTION
Replace rear brake caliper carriers with new part number, as well as discs and pads.
PROCEDURE
For conditions that are similar to the situation described:
1. Identify, by external observation, where the noise is coming from.
Is the sound coming from the rear brakes?
YES- go to next step.
NO – continue diagnosis with ISTA NED.
2. Identify the rear brake caliper carrier part numbers:
a. Compare vehicle caliper carrier part numbers to the “old” part numbers listed below
“OLD” Part Number
Description
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Standard brakes
34 20 6 870 579
Caliper carrier, left
34 20 6 870 580
Caliper carrier, right
Sport brakes (SA2NH) All models
34 20 6 881 297
Caliper carrier, blue, left
34 20 6 881 298
Caliper carrier, blue, right
b. Does the vehicle brake caliper carrier match the “old” part number listed above?
Yes- go to the next step
No- continue as described in the attached brake squeal repair guide
3. Replace the affected caliper carriers with the “new” part number found in parts information
Note: Brake replacement requires new pads and discs on both sides of the vehicle.
Note: Correct brake pad greasing is important for proper operation and brake squeal elimination.
Failure to properly grease pads (as described in attached brake repair guide) may result in return visit for
squealing brakes.
PARTS INFORMATION
Part Number
Description
Quantity
34 20 6 891 913
Caliper carrier, left
1
34 20 6 891 914
Caliper carrier, right
1
34 20 6 891 915
Caliper carrier, blue, left
1
34 20 6 891 916
Caliper carrier, blue, right
1
Standard brakes 540i and 540xi
Sport brakes (SA2NH) All models
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks.
Defect Code:
3400203900
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Labor Operation:
Labor Allowance:
Description:
34 21 320
Refer to KSD2
Remove and install or replace both rear
brake discs (Main work)
Refer to KSD2
Remove and install or replace both rear
brake discs (Plus work – Vehicle is
already in the workshop)
Refer to KSD2
Remove and install or replace both rear
brake discs (Associated work - Rear
wheels removed)
Refer to KSD2
Remove and install or replace both rear
brake discs (Associated work - rear brake
pads removed with either a covered
maintenance repair or some other repair)
N/A
Associated work - Rear brake discs are
already removed with a either a covered
maintenance repair or some other repair
Or:
34 21 928
Or:
34 21 930
Or:
34 21 932
Or:
No labor (parts only)
Posted: Wednesday, April, 11, 2018
ATTACHMENTS
View PDF attachment B341216_Brake Squeal Poster.
[ Copyright ©2017 BMW of North America, Inc. ]
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B
Only change brake pad
on a used brake disc if
the disc is OK.
Pad thickness < 6mm with
noisy brake or pad
completely worn
Loose pad masses
Loose Shim
C
new pad on used disc:
Use greasing guide
Type Brembo
For further information on noise treatment consult NED & Repair Instructions
Advise customer to avoid if possible hard braking for the next 125miles (as described in hang tag)
8
Attention:donotgrease glued surfaces!
XXXXXXXXXXX
Type Collette
Fixed Caliper (2 - 6 piston)
NO chamfering required in
case of new brake pad and
new disc !
Change brake pad. Cut
or renew brake disc
according to defect
classification in
SI B34 10 16
Brake disc worn (under
minimum thickness)
Friction surface
significantly corroded
Deep groves on the surface of
brake disc
Hang run-in tag from brake pad box in the car
Belagrückenplatte
Type FN or IPS
Floating Caliper (1 to 2 piston)
Greasing Brake Pads and Brake Caliper Contact Points
Chamferthenewbrakepad
ifappliedonuseddisc!
.
Cleaning Brake Calipers with a brush, brake cleaner and rag according to
Full Repair Instructions available on ISTA.
contamination
with screwdriver if
necessary.
Clean brake pad surface
with sandpaper (grit size 80
/100).
Pry out
Select repair option:
Metal splinters in pad
Debris in the surface
Brake pad surface
contamination
Identify one of the following causes:
7
6
5
4
3
A
2
Brake Squeal Repair Guide
the type of noise with a test-drive & NED
1 Analyze
Determine if the noise is from the front or rear
Category3 Severecorrosion:resurfacing not
possible.Rotorsmustbereplaced.
*Ifmeasuredrotorthicknessisaboveminimumthicknessplus0.5mm
Category2 Corrosion:cannotbeusedwithnew
brakepads.OKtoresurface*.Aftercutting,
usenewbrakepads
Category1 Nocorrosionfound:OKtousenew
brakepads(resurfacingnotneeded)
CATEGORIZATIONOFBRAKE DISC
CORROSION
*Ifdeepestgroovemeasuredbelowminimum thickness
Category3 Severegrooves:resurfacing*not
possible.Rotorsmustbereplaced.
*Ifmeasuredrotorthicknessisaboveminimumthicknessplus0.5mm
Category2 Grooves:cannotbeusedwithnew
brakepads.OKtoresurface*.Aftercutting,
usenewbrakepads
Category1 Nogroovesfound:OKtousenew
brakepads(resurfacingnotneeded)
CATEGORIZATIONOFBRAKE DISC
GROOVES