Kia Niro: AHB(Active Hydraulic Boost) System / Rear Disc Brake Repair procedures

Removal
1.

Remove the wheel & tire.

2.

Remove the parking brake cable pin (A).

3.

Rotates the nut (A) in the counterclockwise direction and then remove the parking cable.

4.

Loosen the guide rod bolt (B) and pivot the caliper (A) up out of the way.

Tightening torque:

21.6 - 31.4 N·m (2.2 - 3.2 kgf·m, 15.9 - 23.1 lb·ft)

5.

Remove the pad return spring (A), brake pad and rear caliper.

Tightening torque:

63.7 - 73.5 N·m (6.5 - 7.5 kgf·m, 47.0 - 54.2 lb·ft)

  

Pad return springs must be replaced with new ones whenever pads are replaced.

Technicians should be careful not to deform pad return springs.

When pad return springs are deformed, it may cause improper braking, more fuel consumption.

6.

Loosen the screw and then remove the brake disk (A).

Tightening torque :

4.9 - 5.8 N·m (0.5 - 0.6 kgf·m, 3.6 - 4.3 Ib·ft)

Inspection

Rear Brake Disc Thickness Check

1.

Check the brake pads for wear and fade.

2.

Check the brake disc for damage and cracks.

3.

Remove all rust and contamination from the surface, and measure the disc thickness at 8 points, at least, of same distance (5mm) 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)

4.

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

Rear Brake Pad Check

1.

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

Pad thickness

Standard value: 15 mm (0.5906 in)

Service limit: 8.0 mm (0.3150 in)

2.

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

Rear Brake Disc Runout Check

1.

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)

2.

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

3.

If the runout does not meet the limit specification, remove the disc, turn it 180° and reinstall. Then check the runout of the brake disc again.

4.

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

Installation
1.

Installation is the reverse of removal.

2.

Use a SST (09580-0U000) when installing the brake caliper assembly.

  

Do not hit piston end by hammer or prying directly against piston face with screwdriver to push in piston.

Use wood or a used pad to protect piston end. Pushing on the wood or used pad is recommended.

When spreading a piston, it is best to use SST 09581-11000 and 09580-0U000.

3.

After filling the brake fluid in the reservoir, perform the air bleed.

(Refer to the Brake system - "Brake Bleeding Procedure")

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