Mazda CX-9 Grand Touring. Manual — part 135

DISC PAD (FRONT) REPLACEMENT

1. Remove in the order indicated in the table.

2. Install in the reverse order of removal.

3. After installation, depress the brake pedal a few times, rotate the wheel by hand, and verify that the brake

does not drag.

Fig. 27: Identifying Disc Pad Components (Front) & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

CALIPER (FRONT) DISASSEMBLY/ASSEMBLY

1. Disassemble in the order indicated in the table.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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Fig. 28: Identifying Caliper Components (Front) & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

2. Assemble in the reverse order of removal.

PISTON DISASSEMBLY NOTE

1. Place the SST in the caliper, then blow compressed air through the hole to force the piston out of the

caliper.

WARNING:



When compressed air is blown into the caliper body, injury to a
finger or other part from pinching could result from the piston
springing up. When blowing in compressed air, do not place your
fingers between the piston and caliper body when performing the
work.

CAUTION:



The piston could be damaged if blown out with great force. Blow the
compressed air slowly to prevent the piston from suddenly popping
out.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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Fig. 29: Identifying SST In Caliper
Courtesy of MAZDA MOTORS CORP.

REAR BRAKE (DISC) INSPECTION

BRAKE JUDDER REPAIR HINT

Description

Brake judder concern has the following three characteristics:

Steering wheel vibration

Steering wheel vibrates in the direction of its rotation. This characteristic is most noticeable when applying
brakes at a vehicle speed of 100-140 km/h {62-87 mph} .

Floor vibration

When applying brakes, the vehicle body shakes back and forth. The seriousness of shake is not influenced by
vehicle speed.

Brake pedal vibration

When applying brakes, a pulsating force tries to push the brake pad back. The pulsation is transmitted to the
brake pedal.

The following are the main possible causes of brake judder:

Due to an excessive runout (side-to-side wobble) of disc plate, the thickness of disc plate is uneven.

If the runout is more than 0.05 mm {0.002 in} at the position 10 mm {0.39 in} from the disc plate edge,
uneven wear occurs on the disc plate because of uneven pad/plate contact.

If the runout is less than 0.05 mm {0.002 in}, uneven wear does not occur.

The disc plate is deformed by heat.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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Repeated panic braking may raise the temperature in some portions of disc plate by approx. 1,000 °C {1,832 °
F}. This results in deformed disc plate.

Due to corrosion, the thickness and friction coefficient of disc plate change.

If a vehicle is parked under damp conditions for a long time, corrosion occurs on the friction surface of disc
plate.

The thickness of corrosion is uneven and sometimes appears like a wave pattern, which changes the friction
coefficient and causes a reaction force.

Inspection and repair procedure

Fig. 30: Inspection & Repair Procedure Diagram
Courtesy of MAZDA MOTORS CORP.

Lateral runout inspection

1. To secure the disc plate and the hub, tighten the hub nuts upside down or insert a washer (thickness 10

mm {0.39 in} with an inner diameter more than 12 mm {0.47 in}) between the hub bolt and the hub nut.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:48:49 AM

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© 2005 Mitchell Repair Information Company, LLC.