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Mazda CX-5 Service & Repair Manual: Front Brake (Disc) Inspection

Mazda CX-5 Service & Repair Manual / Brakes / Disc Brakes / Front Brake (Disc) Inspection

Brake Judder Repair Hints

Description

1. Brake judder concern has the following 3 characteristics:

Steering wheel vibration

1. The steering wheel vibrates in the rotation direction. This characteristic is most noticeable when applying brakes at a vehicle speed of 100—140 km/h {62.2—86.9 mph}

.

Floor vibration

1. When applying the brakes, the vehicle body shakes back and forth. The seriousness of the shaking is not influenced by vehicle speed.

Brake pedal vibration

1. When applying the brakes, a pulsating force tries to push the brake pad back. The pulsation is transmitted to the brake pedal.

2. The following are the main possible causes of brake judder:

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 0.04 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 0.04 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.

Inspection and repair procedure


Lateral runout inspection

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:

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.


3. Rotate the disc plate one time and measure the runout.

Thickness variation inspection

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).


3. Subtract the minimum value from the maximum, and if the result is not within the specification, machine the disc plate using a lathe.

WARNING:

Disc Plate Thickness Inspection

CAUTION:

1. Measure the thickness of the disc plate.

Disc Pad Thickness Inspection

1. Jack up the front of the vehicle and support it with safety stands.

2. Remove the wheels and tires.

3. Verify the remaining thickness of the pads.

4. Replace the pads as a set (right and left wheels) if either one is at or less than the minimum thickness.


Front Brake (Disc)
Purpose/Function Large diameter, ventilated disc type front brakes with a 297 mm {11.7 in} diameter and 28 mm {1.1 in} thickness have been adopted, improving braking force and fade resist ...

Front Brake (Disc) Removal/Installation
1. Remove in the order indicated in the table. 2. Install in the reverse order of removal. 3. After installation, add brake fluid, bleed the air, and inspect for fluid leakage.. 4. Depress the ...

Other materials:

Windshield Wiper Arm And Blade Removal/Installation
Windshield Wiper Arm 1. Open the hood. CAUTION: If excessive force is applied when removing the cap, tabs could break. Carefully remove the cap. 2. Insert a tape-wrapped precision flathead screwdriver into the gap between the windshield wiper arm and cap, and slightly raise the ...

Condenser Inspection
1. Inspect the condenser for cracks, damage, and oil leakage. If there is any malfunction, replace the condenser. 2. Visually inspect for bent fins for clogging of foreign material. If any fins are clogged, remove the foreign material. 3. Visually inspect for bent fins. ...

Wheel Hub Component Inspection
Wheel Bearing Excessive Play Inspection 1. Install the magnetic base and dial gauge as shown in the figure and measure the wheel bearing axial excessive play. If it exceeds the maximum specification, replace the wheel hub component. Rear wheel bearing maximum play ...

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