
Service Bulletin
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IT ia Z D a
Irvine, California 92718
Telephone (714) 727-1990
Category
P
Applicable Model/s
All Models
Subject
BRAKE JUDDER REPAIR
Bulletin
No.
006/94
Issued
9/1/94
Revised
12/23/94
The revised portion of this bulletin is indicated by an asterisk (*). Replace the original bulletin with this revised
copy.
DESCRIPTION
Customers who complain of vibration or pulsation in the steering wheel, brake pedal, floor or seat while applying
the brakes may be experiencing symptoms of brake
judder.
Judder is caused by:
• Disk Thickness Variation (DTV)
• rotor run-out and/or
• rotor surface rust (which leads to DTV)
This bulletin describes the causes and corrections for each condition.
CAUSES OF JUDDER
1. Disc Thickness Variation (DTV> - DTV creates a vibration/pulsation during application of the brakes. DTV
will increase with mileage accumulation if the run-out of the disc is excessive.
2.
Disc Rotor Run-Out - Run-out, or rotor “wobble”, leads to DTV. it is corrected by precision machining to
bring the run-out within specification.
3. Rotor Surface Rust - Under certain conditions (storage or use in extreme environments), the surface of the
brake rotors may become rusted in the pad non-contact area. If this corrosion penetrates the rotor surface
deeply enough, it will not wear or rub off during normal use. This will cause DTV.
CORRECTION
In order to effectively correct brake judder, rotor surfaces must be precisely machined. Mazda Motor of America
has evaluated both on and off-car brake lathes and has determined that on-car lathes are more precise and
greatly reduce comeback repairs.
The steps necessary for correction of brake judder are as follows:
1. If the vehicle is in dealer inventory and the condition (s rotor rust:
a. Clean the rotor surface by driving the vehicle several miles while frequently applying the brakes.
b. If vibration/pulsation is still felt, proceed to step “c”.
c. Machine the rotor surface enough to remove all rust or surface staining (generally 0.1mm per side).
NOTE: If machining is performed, the Service Manager’s signature must appear on the repair order.
2.
If the vehicle has been in service:
a. Verify customer’s complaint with a test drive.
b. If brake judder is felt, proceed to step c. If brake judder is not felt, refer to the workshop manual or the
NVH manual for additional troubleshooting information.
c. Mark the front wheel(s) and the lug nut stud with chalk. This will determine the original position of the
wheel to the rotor. Remove the front wheel(s).
NOTE: A high majority of brake judder is due to DTV of the front rotors. Customer complaints of brake
judder are most often corrected by m achining the front rotors only.
d. Measure the remaining front rotor thickness and run-out. Determine if sufficient rotor material remains to
allow machining. Limit: Stated minimum thickness for the model plus 0.8mm.
e. If machining can be achieved, an on-car brake lathe is recommended and will be required fo r all w ar
ranty repairs after January 1 .1 9 9 5 to ensure a precise rotor surface.
C o n t in u e d O n N e x t P a g e
IMPORTANT: Service and Parts Managers should read this bulletin carefully, sign and convey all information to those concerned.
index *
0^03o0
Page 1 of 2
Signature__________________
Parts Manager
Содержание 626 1989
Страница 90: ...4B OUTLINE COMPONENT LOCATION Input and Output Devices Solenoid valve VIC 76G04C 004 ...
Страница 92: ...4B OUTLINE Exhaust System ...
Страница 93: ...76G04C 007 ...
Страница 103: ... TROUBLESHOOTING WITH SST 4 B 76F04B 011 76F04B 012 Code No 08 Air flow sensor PC Possible Cause Next page 4B 17 ...
Страница 107: ... TROUBLESHOOTING WITH SST 4 B No 41 Code Solenoid valve Variable inertia control VIC PC Possible Cause 76G04C 034 ...
Страница 110: ...4 B SWITCH MONITOR FUNCTION Idle switch 76F04B 020 Blower switch 76F04 B 021 Headlight switch Rear defroster switch ...
Страница 188: ...C 49N0 17 201 Setting Plate 49N0 17 2Q2 Handle V 49N0 17 203 Stopper PAGE 2 OF 3 ...
Страница 648: ...Table IV Substantially Identical Kecovei onlv Equipment None approved as of this date ...
Страница 677: ...Number 001 94 Date Issued 2 28 94 Revised 323 PROTEGE Page 2 of 8 ...
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Страница 703: ...Number 005 97 Date Issued 03 10 97 Revised Page 10 of 10 ...
Страница 711: ...Protege 1989 94 Protege 1995 MX 3 1992 96 RX 7 1993 96 ...
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Страница 714: ...Millenia 1995 High Side J Low Side K ...
Страница 720: ...Figure 8 MX 6 626 A C System Figure 9 B Series A C System Pace 3 of 4 ...
Страница 721: ...Figure 12 323 Protege AtC System Page 4 of 4 ...
Страница 726: ...1 ASSEMBLY TIMING BELT TIMING BELT To que Specifications i 1 25 1 75 m kg 109 152 in tbl 1 7 2 69G D 1B160 ...
Страница 736: ...MEMO if A R FRONT SUSPENSION DOUBLE WISHBONE R 22 3 1989 B2200 B2600i Revised 5 91 New page ...
Страница 740: ...B ______________ ASSEMBLY TIMING BELT TIMING BELT 69G 01B160 B 66 ...
Страница 748: ...R FRONT SUSPENSION DOUBLE WISHBONE MEMO i 4 R 22 3 1990 02200 B2600I Revised 5 91 New page ...
Страница 762: ...R FRONT SUSPENSION DOUBLE WISHBONE MEMO 4 R 22 3 1991 B2200 B2600i Revised 5 91 New page ...
Страница 768: ... 1989 626 MX 6 50 96 Revised B 91 ...