Mazda 3 manuals

Mazda 3 Service Manual: Power Brake Unit Inspection

Mazda 3 Service Manual / Brakes / General / Power Brake Unit Inspection

NOTE:

Without Using SST

Operation inspection

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.

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. Install the SST

(49 D043 0A0) to the master cylinder (secondary side) in the orientation shown in the figure.


NOTE:

2. Connect the SSTs

, a vacuum gauge, and a pedal force gauge to the master cylinder, and bleed the air from the SSTs

and the brake line. (Bleed the air from the SSTs

using air bleed valve A.)


Checking for vacuum loss (loaded condition)

1. Start the engine.

2. Depress the brake pedal with a force of 200 N {20.4 kgf, 45.0 lbf}

.

3. Stop the engine when the vacuum gauge reading reaches 68 kPa {510 mmHg, 20 inHg}

with the brake pedal depressed.

4. Measure the amount of vacuum decrease for 15 s

immediately after stopping the engine.

5. If the amount of vacuum decrease is 3.3 kPa {25 mmHg, 0.97 inHg}

or less, the power brake 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

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

Pedal force

Fluid pressure

200 N {20.4 kgf, 45.0 lbt}

500 kPa {5.10 kgf/cm2, 72.5 psi} or more


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. Master cylinder fluid pressure (MZR 2.0, SKYACTIV-G 2.0, MZR 2.5)

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

Pedal force

Fluid pressure

200 N {20.4 kgf, 45.0 lbt}

6,500 kPa {66.28 kgf/cm2, 942.7 psi} or more


Master cylinder fluid pressure (MZR 2.3 DISI Turbo)

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

Pedal force

Fluid pressure

200 N {20.4 kgf, 45.0 lbt}

7,000 kPa {71.38 kgf/cm2, 1,015 psi} or more


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