Conventional Brake System: Other Mazda 3 BL рестайлинг

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.

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

1. 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 the pad contacts the plate unevenly.
2. If the runout is less than 0.05 mm {0.002 in} , uneven wear does not occur.

The disc plate is deformed by heat

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

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

1. If the vehicle is parked in damp conditions for a long time, corrosion occurs on the friction surface of the disc plate.
2. The thickness of corrosion is uneven and sometimes appears like a wave pattern, which changes the friction coefficient and causes a reaction force.

Front Brake (Disc) Inspection And Repair Procedure Flow Chart. Scheme 101

1. To secure the disc plate and the hub, insert the washer (thickness 10 mm {0.39 in}, inner diameter more than 12 mm {0.47 in} ) between each hub bolt and the hub nut, then tighten all the hub nuts. NOTE: The component parts of the SST (49 B017 001 or 49 G019 003) can be used as a suitable washer.
2. After tightening all the hub nuts to the same torque, put the dial gauge on the friction surface of the disc plate 10 mm {0.39 in} from the disc plate edge. (Scheme 102): Inspecting Lateral Runout
3. Rotate the disc plate one time and measure the runout. Front disc plate runout limit 0.05 mm {0.002 in}

Scheme 102

1. Clean the disc plate-to-pad friction surface using a brake cleaner.
2. Measure the points indicated in the illustration using a caliper (micrometer). see scheme 56: Measuring Disc Plate Points Using Caliper (Micrometer)
3. Subtract the minimum value from the maximum, and if the result is not within the specification, machine the disc plate using a lathe. Thickness variation limit 0.015 mm {0.00059 in} WARNING: Do not exceed minimum disc plate thickness.

1. 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 the pad contacts the plate unevenly.
2. If the runout is less than 0.05 mm {0.002 in} , uneven wear does not occur.

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

1. If the vehicle is parked in damp conditions for a long time, corrosion occurs on the friction surface of the disc plate.
2. The thickness of corrosion is uneven and sometimes appears like a wave pattern, which changes the friction coefficient and causes a reaction force.

Rear Brake Disc Inspection And Repair Procedure Flow Chart. Scheme 103

1. To secure the disc plate and the hub, insert the washer (thickness 10 mm {0.39 in}, inner diameter more than 12 mm {0.47 in} ) between each hub bolt and the hub nut, then tighten all the hub nuts. NOTE: The component parts of the SST (49 B017 001 or 49 G019 003) can be used as a suitable washer.
2. After tightening all the hub nuts to the same torque, put the dial gauge on the friction surface of the disc plate 10 mm {0.39 in} from the disc plate edge. (Scheme 104): Inspecting Disc Plate Lateral Runout
3. Rotate the disc plate one time and measure the runout. Rear disc plate runout limit 0.05 mm {0.002 in}

Scheme 104

1. Clean the disc plate-to-pad friction surface using a brake cleaner.
2. Measure the points indicated in the illustration using a caliper (micrometer). see scheme 87: Measuring Disc Plate Points Using Caliper (Micrometer)
3. Subtract the minimum value from the maximum, and if the result is not within the specification, machine the disc plate using a lathe. Thickness variation limit 0.015 mm {0.00059 in} WARNING: Do not exceed minimum disc plate thickness.