Toyota Yaris: Front Brake / Inspection

INSPECTION

PROCEDURE

1. INSPECT BRAKE CYLINDER AND PISTON

(a) Check the front disc brake cylinder bore and front disc brake piston for rust and scoring.

If necessary, replace the front disc brake cylinder assembly and front disc brake piston.

2. INSPECT PAD LINING THICKNESS

(a) Using a ruler, measure the front disc brake pad lining thickness.

Standard Thickness:

8.8 mm (0.346 in.)

Minimum Thickness:

1.0 mm (0.0394 in.)

If a front disc brake pad lining thickness is less than the minimum thickness, replace the front disc brake pads.

HINT:

Be sure to check the front disc thickness when replacing the front disc brake pads with new ones.

3. INSPECT FRONT DISC BRAKE ANTI-RATTLE SPRING

(a) Clean the front disc brake anti-rattle spring and check it for deformation and cracks.

If necessary, replace the front disc brake anti-rattle spring.

4. INSPECT DISC THICKNESS

(a) Using a micrometer, measure the front disc thickness. Standard Thickness: 28.0 mm (1.10 in.) Minimum Thickness: 25.0 mm (0.984 in.) If the front disc thickness is less than the minimum thickness, replace the front disc.

*a Micrometer

5. INSPECT DISC RUNOUT

(a) Inspect the front axle hub bearing looseness and front axle hub runout.

Click here

(b) Hold the front disc, tighten the front disc with the 5 hub nuts.

Torque:

30 N·m {306 kgf·cm, 22 ft·lbf}

NOTICE:

Do not overtighten the hub nuts as the installation part of the nut is made of aluminum.

(c) Using a dial indicator, measure the disc runout 10 mm (0.394 in.) from the outer edge of the front disc. Maximum Disc Runout: 0.05 mm (0.00197 in.) NOTICE: Keep the magnet of the dial indicator away from the front axle hub sub-assembly and front speed sensor. If the runout exceeds the maximum value, change the installation position of the front disc to minimize the runout. If the runout exceeds the maximum even when the installation position is changed, replace the front disc.

*a Dial Indicator

(d) Remove the 5 hub nuts and front disc.