Mazda MX-5 Miata / Grand Touring. Manual — part 30

Fig. 20: Inspecting Vacuum Loss Function - With DSC
Courtesy of MAZDA MOTORS CORP.

Checking For Vacuum Loss (Loaded Condition)

1. Start the engine.

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

3. With the brake pedal depressed, turn off the engine when the vacuum gauge reaches 68 kPa {510 mmHg,

20.1 inHg} .

4. Within 15 s right after stopping the engine, measure the lowest amount of vacuum.

5. If the lowest amount is 3.3 kPa {25 mmHg, 1.0 inHg} or less, the system is normal.

Lack of Hydraulic Pressure Inspection

1. With the engine stopped and the vacuum amount at 0 kPa {0 mmHg, 0 inHg} if the pedal force and fluid

pressure correlation is within the specification, the system is normal.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Conventional Brake System - MX-5 Miata

Power Brake Unit Fluid Pressure

POWER BRAKE UNIT FLUID PRESSURE SPECIFICATIONS

Hydraulic Pressure Inspection

1. Start the engine and when the vacuum amount reaches 66.7 kPa {500 mmHg, 19.7 inHg} , depress the

brake pedal.

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

normal.

Power Brake Unit Fluid Pressure

POWER BRAKE UNIT FLUID PRESSURE SPECIFICATIONS

POWER BRAKE UNIT REMOVAL/INSTALLATION

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

2. Remove the clutch pipe. (MT)

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

Pedal force (N {kgf, lbf})

Fluid pressure (kPa {kgf/cm

2

, psi})

200 {20.4, 44.9}

620 {6.33, 90.0} or more

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

Pedal force (N {kgf, lbf})

Fluid pressure (kPa {kgf/cm

2

, psi})

200 {20.4, 44.9}

6,340 {64.65, 919.6} or more

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Conventional Brake System - MX-5 Miata

Fig. 21: View Of Clutch Pipe & Components (With Torque Specifications)
Courtesy of MAZDA MOTORS CORP.

3. Remove the nut shown in Fig. 22 , then remove the cooler hose (LO) bracket from the vehicle.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Conventional Brake System - MX-5 Miata

Fig. 22: View Of Cooler Hose (LO) Bracket
Courtesy of MAZDA MOTORS CORP.

4. Remove in the order indicated in Fig. 23 .

Fig. 23: Identifying Power Brake Unit Components (With Torque Specifications)
Courtesy of MAZDA MOTORS CORP.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Conventional Brake System - MX-5 Miata