Mazda CX-9 Grand Touring. Manual — part 132

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

3.7] .)

3. Remove the bolt and nut as shown in the figure, and move the vacuum pipe bracket.

4. Remove in the order indicated in the table.

5. Install in the reverse order of removal.

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

Fig. 12: Identifying Vacuum Pipe Bracket, Bolt, Nut & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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

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Fig. 13: Identifying Brake Fluid Level Sensor Connector, Brake Pipe, Master Cylinder Component,
Reverse Tank, O-Ring & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

BRAKE FLUID LEVEL SENSOR INSPECTION

1. Disconnect the brake fluid level sensor connector from the master cylinder.

2. Inspect for continuity according to fluid level between the brake fluid level sensor terminals.



If not as indicated in the table, replace the No.1 reserve tank. (See MASTER CYLINDER
REMOVAL/INSTALLATION.)

Fig. 14: Connector Terminal Reference
Courtesy of MAZDA MOTORS CORP.

Fig. 15: Identifying Brake Fluid Level Sensor Connector Terminal
Courtesy of MAZDA MOTORS CORP.

POWER BRAKE UNIT INSPECTION

WITHOUT USING SST

Operation inspection

NOTE:



The following inspection methods are simple inspection methods to judge
the function of the power brake unit.



If there is any malfunction in the power brake unit, replace the power brake
unit as a single unit.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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1. With the engine stopped, pump the pedal a few times.

2. With the pedal depressed, start the engine.

3. If the pedal moves down slightly immediately after starting the engine, the unit is normal.

Vacuum function inspection

1. Start the engine.

2. Stop the engine after driving the vehicle for 1-2 min.

3. Depress the pedal with normal force.

4. If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is normal.



If a problem is found, inspect for, damage to or improper installation of the check valve and
vacuum hose. After repairing, inspect again.

Vacuum loss function inspection

1. Start the engine.

2. Depress the pedal with normal force.

3. With the pedal depressed, stop the engine.

4. Hold the pedal depressed for approx. 30 s .

5. If the pedal height does not change during this time, the unit is normal.

USING SST

Pre-inspection preparation

1. Disconnect the brake pipe flare nut area using the commercially available flare nut wrench as shown in

the figure.

2. Remove the clamp and disconnect the brake hose.

Fig. 16: Identifying Clamp, Brake Hose & Brake Pipe
Courtesy of MAZDA MOTORS CORP.

3. Install the SST to the brake pipe as shown in the figure.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Conventional Brake System - Mazda CX-9

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4. Bleed the brake line and the SSTs of air. Bleed the air form the SSTs using bleeder screw A.

5. Install the pedal force gauge to the brake pedal.

6. Connect the vacuum gauge to the vacuum line.

Fig. 17: Installing Brake Pipe To SST
Courtesy of MAZDA MOTORS CORP.

Vacuum loss inspection

1. Start the engine.

2. Depress the brake pedal with a force of 200 N {20.4 kgf, 44.9 lbf}.

3. Stop the engine when the vacuum gauge reading reaches 68 kPa {510 mmHg, 20.1 inHg} with the pedal

depressed.

4. With the engine off, observe the vacuum gauge for 15 s.

5. If the gauge has dropped 3.3 kPa {25 mmHg, 1.0 inHg} or less, the unit is normal.

Lack of hydraulic pressure inspection

1. If the pedal force and fluid pressure correlation is within the specification with the engine stopped and a

vacuum amount of 0 kPa {0 mmHg, 0 inHg}, the system is normal.

Master cylinder fluid pressure

MASTER CYLINDER FLUID PRESSURE SPECIFICATION

Hydraulic pressure inspection

1. Start the engine. Depress the brake pedal when the vacuum reaches 66.7 kPa {500 mmHg, 19.7 inHg}.

2. At this time, apply the indicated pedal force and if the fluid pressure is within the specification, the unit is

normal.

Vacuum amount at o kPa {0 mmHg, 0 inHg}

Pedal force (N {kgf, lbf})

Fluid pressure (kPa {kgf/cm

2

, psi})

200 N {20.4 kgf, 44.9 lbt}

520 kPa {5.31 kgf/cm

2

, 75.5 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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© 2005 Mitchell Repair Information Company, LLC.