Replace a single rear brake rotor on a 2015 Kia Forte 1.8L, including caliper removal, rotor replacement, and proper torque specifications.

Warnings

Tools required

Parts

• Rear brake rotor × 1 — Use OEM specification or equivalent
• Rotor set screw (if corroded) × 1 — M6 x 1.0 Phillips

Preparation

1. Park vehicle on level ground and engage parking brake
2. Loosen rear wheel lug nuts 1/4 turn while vehicle is on ground
3. Raise rear of vehicle with floor jack and secure on jack stands at proper jacking points
4. Remove rear wheel completely
5. Inspect brake system for fluid leaks, damaged lines, or excessive pad wear on the side being serviced

Procedure

1. 1

   Compress caliper piston
   Before removing the caliper, compress the piston slightly to ease removal and prevent brake fluid overflow. Use a C-clamp placed between the caliper body and the outboard brake pad backing plate. Compress slowly until the piston retracts approximately 2-3mm. Monitor the brake fluid reservoir and remove fluid with a turkey baster if it approaches the MAX line.
2. 2

   Remove caliper slide pin bolts
   Locate the two caliper slide pin bolts on the rear of the caliper assembly. Using a 17mm socket, remove both slide pin bolts. Note that these are the bolts that allow the caliper to slide, not the bracket mounting bolts. Keep these bolts clean as they will be reused.
   ⚠Support the caliper before removing the second bolt to prevent it from falling and damaging the brake hose.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
3. 3

   Support and secure caliper
   Carefully lift the caliper assembly off the rotor and bracket. Do NOT let the caliper hang by the brake hose. Use a wire hanger or bungee cord to suspend the caliper from the suspension spring or another sturdy component. Ensure there is no tension or kinking on the brake hose.
   ⚠Never allow the caliper to hang unsupported by the brake hose as this can damage the hose internally and cause brake failure.
4. 4

   Remove caliper bracket
   Using a 19mm socket, remove the two caliper bracket bolts that secure the bracket to the hub/knuckle assembly. These bolts are larger and require significantly more torque than the slide pins. The bracket will come off completely, exposing the rotor. Inspect the bracket for wear and damage.
   ℹ️Caliper bracket bolts are high-torque fasteners. They may require significant force to break loose.
   Torque spec

   Caliper Bracket Bolts97 Nm (71 lb-ft)
5. 5

   Remove rotor set screw
   Locate the Phillips head set screw on the face of the rotor (typically one screw on rear rotors). Use a Phillips screwdriver to remove this screw. If the screw is corroded or stripped, use a drill or impact driver. This screw is for assembly retention only and can be discarded if damaged.
   Torque spec

   Rotor Set Screws6 Nm (5 lb-ft)
6. 6

   Remove old rotor
   Pull the rotor straight off the hub. If the rotor is stuck due to rust or corrosion, tap around the rear hat section with a rubber mallet or use the threaded holes (if present) to press the rotor off with bolts. Clean the hub face thoroughly with a wire brush, removing all rust, corrosion, and debris. The hub face must be clean and flat for proper rotor seating.
   ⚠Do not hammer on the rotor friction surface or mounting face as this can cause warping.
7. 7

   Prepare and install new rotor
   Remove any protective coating from the new rotor using brake cleaner and a clean cloth. Clean both friction surfaces thoroughly. Apply a thin coat of anti-seize compound to the hub face (not the rotor friction surface). Slide the new rotor onto the hub, aligning the screw hole. Rotate the rotor to ensure it seats fully against the hub face with no wobble.
   ⚠Never apply oil, grease, or anti-seize to the rotor friction surfaces. Clean surfaces are critical for proper braking.
8. 8

   Install rotor set screw
   Insert a new or reusable set screw and tighten to specification using a torque wrench or hand-tighten snugly if torque wrench is unavailable. This screw only holds the rotor during assembly and is not safety-critical.
   Torque spec

   Rotor Set Screws6 Nm (5 lb-ft)
9. 9

   Reinstall caliper bracket
   Position the caliper bracket over the rotor and align the bolt holes with the hub/knuckle. Install both caliper bracket bolts and tighten to specification in a cross pattern. Ensure the bracket is seated flush against the mounting surface.
   Torque spec

   Caliper Bracket Bolts97 Nm (71 lb-ft)
10. 10

    Reinstall caliper assembly
    Apply a thin coat of silicone brake grease to the slide pin bolts (on the smooth shaft portion, not threads). Position the caliper over the rotor and bracket, ensuring the brake pads are on either side of the rotor. Align the slide pin bolt holes and insert both bolts. Tighten to specification.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
11. 11

    Reinstall wheel and torque lug nuts
    Mount the wheel onto the hub and install all lug nuts by hand. Lower the vehicle until the tire just contacts the ground (prevents wheel rotation). Using a torque wrench, tighten the lug nuts to specification in a star pattern. Fully lower the vehicle and recheck torque.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Pump the brake pedal several times until firm pedal feel is restored before moving the vehicle
2. Check brake fluid level in the master cylinder reservoir and top off with DOT 4 brake fluid if needed
3. Remember that rotors should be replaced in pairs - repeat this procedure on the opposite rear wheel

Verification

• Verify firm brake pedal before driving - pedal should not sink to the floor
• Test brakes at low speed in a safe area to ensure proper operation and no pulling to one side
• Listen for any abnormal noises such as grinding, squealing, or rubbing
• After 50-100 miles, recheck wheel lug nut torque
• Perform brake bedding procedure: 5-10 moderate stops from 30-40 mph with cool-down periods between stops to properly seat the pads to the new rotor surface

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