One of the symptoms of a defective ABS module is the ESC (Electronic Stability Control) light turning on. The ABS module has ESC integrated, which helps stabilize your car while cornering and avoids skidding during hard braking.
The pictures in this tutorial are from a 2016 Kia Optima. Still, owners of other Kia models such as Forte, Forte5, Rio, Sorento, Soul, Sportage, Rondo, Sedona, Borrego will find these DIY instructions helpful.
What you will need
- Disconnect battery. Open the hood of your vehicle and disconnect the battery.
- Locate the ABS Module / ESC Control Module. This Kia Optima is located in the engine bay, passenger side, near the firewall. Regardless of the Kia model, the ABS pump can be found in the engine bay.
- Unplug the connector. Press the red locking tab and release that first. Next, pull up on the grey connector to unplug the wire harness.
- Remove the brake fluid from the master cylinder using a syringe. Be careful not to let dirt or any particles fall inside the brake fluid reservoir.
- Do not allow brake fluid to fall on your car's exterior paint as it causes damage to your car.
- Disconnect the brake lines from the ABS unit using an 11 mm wrench. The four brake lines that supply brake fluid to the brakes are held in place with small nuts.
- Remove the ABS module. Remove the bolts that hold the brake module in place. Two 10 mm bolts need to be removed. Now you should be able to remove the ABS brake module/pump.
- Install the new ABS module in reverse order.
- Add brake fluid to the reservoir. The brake fluid level will go down as you start to bleed the air out of the system. Check the brake fluid level as you bleed the air and add fluid if needed.
- Remember to bleed air out of the system at each brake caliper. Start with the wheel farthest from the ABS module.
- Brake Line Bolts (M10): 11 lb-ft
- Brake Line to Reservoir (M12): 16 lb-ft
- Bolts - Bracket to Frame: 21 lb-ft
ABS Module Repair
An economical way to get your ABS module problems fixed is to have your existing ABS module repaired. Remove the module from the car and ship it to a third-party company that offers ABS Module Repair Service on eBay. It is a lot cheaper to fix your existing unit than replace it.