Kia Rio: Chassis / Disc Brakes and Pads

Check the brake pads for wear and fade.

Check the brake disc for damage and cracks.

Remove all rust and contamination from the surface, and measure the disc thickness at 8 points, at least, at the same distance apart (5mm) from the brake disc outer circle.

Front brake disc thickness

- Standard: 22 mm (0.8661 in)

- Service Limit: 20.4 mm (0.8031 in)

Deviation: Less than 0.005 mm (0.0002 in)

If wear exceeds the limit, replace left and right discs and pad assemblies of the vehicle.

Check the pad wear. Measure the pad thickness and replace it, if it is less than the specified value.

- Standard: 11mm (0.43 in)

- Service limit: 2.0mm (0.0787 in)

Check that grease is applied to sliding contact points. Check for metal damage to the pad and backing.

Place a dial gauge about 5 mm (0.2 in.) from the outer circumference of the brake disc, and measure the runout of the disc.

Brake disc runout

Limit: 0.04 mm (0.0016 in.) or less (new one)

If the runout of the brake disc exceeds the specified limit, replace the disc, and then measure the runout again.

If the runout does not exceed the specified limit, install the brake disc after turning it 180° and then check the runout of the brake disc again.

If the runout cannot be corrected by changing the position of the brake disc, replace the brake disc.

Check the brake pads for wear and fade.

Check the brake disc for damage and cracks.

Remove all rust and contamination from the surface, and measure the disc thickness at 8 points, at least, at the same distance apart (5 mm) from the brake disc outer circle.

Brake disc thickness

-Standard: 10 mm (0.39 in)

-Service limit: 8.4 mm (0.33 in)

-Deviation: less than 0.01 mm (0.0004 in)

If wear exceeds the limit, replace left and right discs and pad assemblies of the vehicle.

Check the pad wear. Measure the pad thickness and replace it, if it is less than the specified value.

Pad thickness

-Standard value: 10 mm (0.393 in)

-Service limit: 2.0 mm (0.0787 in)

Check that grease is applied to sliding contact points. Check for metal damage to the pad and backing.

Place a dial gauge about 5mm (0.2 in.) from the outer circumference of the brake disc, and measure the runout of the disc.

Brake disc runout

-Limit: 0.05 mm (0.002 in.) or less (new one)

If the runout of the brake disc exceeds the limit specification, replace the disc, and then measure the runout again.

If the runout exceeds the limit specification, install the brake disc after turning it 180° and then check the runout of the brake disc again.

If the runout cannot be corrected by changing the position of the brake disc, replace the brake disc.

Raise the rear of the vehicle, and make sure it is securely supported.

Release the parking brake, and remove the rear brake drum.

Check the wheel cylinder (A) for leakage.

Check the brake linings (B) for cracking, glazing, wear, and contamination.

Measure the brake lining thickness (C).Measurement does not include brake shoe thickness.

If the brake lining thickness is less than the service limit, replace the brake shoes as a set.

Check the bearings in the hub unit for smooth operation. If it requires servicing, replace it.

Measure the inside diameter of the brake drum with inside vernier calipers.

If the inside diameter of the brake drum is more than the service limit, replace the brake drum.

Check the brake drum for scoring, grooves, and cracks.

Inspect the brake lining and drum for proper contact.

Inspect the wheel cylinder outside for excessive wear and damage.

Inspect the backing plate for wear or damage.