Mazda 6 2002 - Front Brake (Disc)

CONVENTIONAL BRAKE SYSTEM
P17
P
Dual Proportioning Valve Installation Note
1. Install the dual proportioning valve so that the R
mark faces the left side of the vehicle.
End Of Si e
FRONT BRAKE (DISC) INSPECTION
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Brake Judder Repair Hint
Description
1. Brake judder concern has the following 3 characteristics:
Steering wheel vibration
1. Steering wheel vibrates in the direction of its rotation. This characteristic is most noticeable when applying
brakes at a vehicle speed of 100140 km/h {62.186.8 mph}.
Floor vibration
1. When applying brakes, the vehicle body shakes back and forth. The seriousness of shake is not influenced by
vehicle speed.
Brake pedal vibration
1. When applying brakes, a pulsating force tries to push the brake pad back occurs. 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 disc plate, the thickness of disc plate is uneven.
1. If the runout is more than 0.05 mm {0.002 in} to 10 mm {0.39 in} from the disc plate edge, an 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 disc plate by approximately 1,000 °
°°
°C
{1,832 °
°°
°F}. This results in deformed disc plate.
Due to corrosion, the thickness and friction coefficient of disc plate change.
1. If a vehicle is parked under damp conditions for a long time, corrosion occurs on the friction surface of 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.
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