Mazda CX-9 Grand Touring. Manual — part 133

Master cylinder fluid pressure

MASTER CYLINDER FLUID PRESSURE SPECIFICATION

After-inspection procedure

1. After the inspection, remove the SSTs, install the brake hose, clamp, and brake pipe to the original

positions, and then bleed the air from the brake line.

Fig. 18: Identifying Brake Pipe To Original Positions & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

POWER BRAKE UNIT REMOVAL/INSTALLATION

1. Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Remove the resonance chamber. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-

3.7] .)

3. Remove the windshield wiper arm and blade. (See WINDSHIELD WIPER ARM AND BLADE

REMOVAL/INSTALLATION .)

4. Remove the cowl grill. (See COWL GRILLE REMOVAL/INSTALLATION .)

5. Remove the windshield wiper motor. (See WINDSHIELD WIPER MOTOR

REMOVAL/INSTALLATION .)

6. Remove the cowl panel. (See COWL PANEL REMOVAL/INSTALLATION .)

7. Remove the master cylinder component. (See MASTER CYLINDER REMOVAL/INSTALLATION.)

8. Remove the nuts as shown in the figure, and move the front heater pipe.

9. Remove the brake pipe (DSC/RSC HU/CM-master cylinder). (See DSC/RSC HU/CM

REMOVAL/INSTALLATION .).

Vacuum amount at 66.7 kPa {500 mmHg, 19.7 inHg}

Pedal force (N {kgf, lbf})

Fluid pressure (kPa {kgf/cm

2

, psi})

200 N {20.4 kgf, 44.9 lbt}

9,000 kPa {91.78 kgf/cm

2

, 1,306 psi} or more

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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Fig. 19: Identifying Front Heater Pipe & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

10. Disconnect the brake pipe (DSC/RSC HU/CM side) as shown in the figure.

11. Remove in the order indicated in the table.

12. Install in the reverse order of removal.

13. After installation, add brake fluid, bleed the air, and inspect for fluid leakage. (See AIR BLEEDING.)

14. Inspect the brake pedal. (See BRAKE PEDAL INSPECTION.)

Fig. 20: Identifying Brake Pipe & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

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.

Fig. 21: Identifying Vacuum Hose, Snap Pin, Cleaves Pin, Power Brake Unit & Torque
Specifications
Courtesy of MAZDA MOTORS CORP.

FRONT 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.

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.

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.

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

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.