CX-7 AWD L4-2.3L Turbo (2008)
Brake Caliper: Customer Interest
Brakes - Noise/Judder/Dragging
Bulletin No: 04-006/09
Last Issued: 06/02/2009
Subject:
BRAKE NOISE, JUDDER AND DRAGGING DIAGNOSIS AND SERVICING
APPLICABLE MODEL(S)/VINS
2006-2010 MX-5
2004-2010 RX-8
2004-2010 MAZDA3
2006-2010 MAZDA5
2003-2010 MAZDA6
2007-2010 CX-7
2007-2010 CX-9
DESCRIPTION
Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of
these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific
brake concern.
REPAIR PROCEDURE
BRAKE NOISE
There are various types of brake noise and many different conditions that can cause noise. Frictional co-efficient between brake pads and rotors varies
depending on pad material, temperature, humidity, braking force, etc. During braking, the brake pads are pressed with great force against the brake rotor.
This generates friction to bring the vehicle to a stop.
^ If the brake pads are of a soft compound, a larger amount of brake dust will appear on the wheels and the pads will wear more rapidly, but there will
be less chance of brake noise.
^ If the brake pads are of a hard compound (as used in high-performance applications), less brake dust will appear, the pads will last longer, and braking
performance will be improved. However, the drawback is that brake noise can occur more easily than with softer compounds.
Finding a balanced compound with the qualities of both hard and soft compounds is difficult.
If you encounter a customer complaint for brake noise, first determine which wheel the noise is located at and repair the cause of the noise. After the
repair is complete, explain to the customer that it is very difficult to completely eliminate brake noise from any vehicle, and that the noise could return
with increased time and mileage.
Groan Or Squeak Noise:
^ If the noise is a groan or squeak while the brakes are applied, refinish the brake pads (providing they have adequate thickness) using sandpaper (grit
#80) or replace the brake pads with new parts.
Brake Dragging Noise:
^ If the noise is due to brake dragging, check the caliper and sliders to ensure they are not seized. Rebuild or replace the caliper and sliders as necessary.
Rattle Or Clunk Noise:
^ If a rattle or clunk noise is present, replace the brake pad shims/mounting hardware or replace the pads after inspecting the fitment of all parts and
determining the cause of the excessive clearance.
When performing a repair requiring refinishing or replacement of the brake pads, lightly sand (use grit #80) the brake rotors to remove old pad material.
In most cases, brake rotor replacement is not necessary to remedy a brake noise condition.
NOTE:
^ Apply locally sourced CRC Disc Brake Quiet (P/N 05016) to the pad backing plates before each of the above repairs.
