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

Remove the wheel & tire.

Remove the caliper hose bracket bolt (A).

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

Remove the return spring (A) and brake pad (B).

• 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

Loosen the caliper bolts and then remove the caliper carrier.

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

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, of same distance (5mm) from the brake disc outer circle.

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

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

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.

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

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.

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

Installation is the reverse of removal.

Use a SST (09581-2T100) when installing the brake caliper assembly.

• Do not hammer on the piston or pry directly against piston face using a screwdriver to push in piston. • How to use the SST (09581-2T100) 1) Connect an air hose (B) to the SST after confirming that the valve of the SST is securely closed. 2) Insert the SST into the caliper and press the caliper piston while opening the valve of the SST slowly by turning it counterclockwise. 3) Close the valve (A) of the SST and disconnect the air hose (B); then, open the valve again to get the rest of air out and remove the SST from the caliper.

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

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