BRAKE JUDDER REPAIR (CANADIAN) CAT. P, NO. 94-06
Article Text (p. 2)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, September 03, 2001 03:36PM
1. If the vehicle is in dealer inventory and the condition is 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, processed to step "C".
C. Machine the rotor surface enough to remove all rust or surface
staining (generally 0.1 mm 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 work shop 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 machining 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 0.8 mm.
E. If machining can be achieved, an on-car brake lathe is
recommended to ensure a precise rotor surface.
NOTE: After machining rotor(s) with an on-car brake lathe, you must
remove all metal cuttings (particles) from the ABS "toothed
ring" (the reluctor) and the ABS sensor. Failure to remove
these particles will prevent proper function of the ABS system.
F. If machining can not be achieved due to rotor thickness
limitations, the dealer should replace the rotor. To ensure a
successful repair, run-out and/or DTV must be removed by
on-car machining, even on new rotor(s).
G. Install the wheel in the same location relative to the hub as
it was originally positioned.