Here's a general outline. Specifics may vary slightly depending on your exact Bronco II model and any modifications. Consult a repair manual specific to your vehicle for the most accurate and detailed instructions.
1. Jack up and secure the Bronco II: Use jack stands to securely support the front end of the vehicle. Never work under a vehicle supported only by a jack.
2. Remove the wheel: Loosen the lug nuts before jacking up the vehicle. Then, remove the wheel.
3. Remove the caliper:
* Option 1 (Easier): If your caliper uses a slide pin, you can usually just remove the pin(s) with a C-clamp or special tool. This allows the caliper to swing away from the rotor without disconnecting the brake line. Be careful not to let the caliper hang by the brake line. You can use a bungee cord or wire to hold it up.
* Option 2 (If slide pins are seized or you prefer): You may need to loosen and carefully remove the brake line at the caliper. This often requires a line wrench to prevent damage. Be prepared for brake fluid to spill; have rags ready. After removing the line, you can then remove the caliper.
4. Remove the caliper mounting bracket (if necessary): On some models, the caliper mounting bracket may need to be removed to access the rotor. This will often involve removing some bolts.
5. Remove the rotor: The rotor usually slides off the wheel studs. Sometimes it's held on by a single center bolt; if so, remove that bolt. If it's stuck, try tapping it gently from the back with a rubber mallet to loosen it. Do not use excessive force. If it's still stuck, you might need to use a rotor puller tool.
6. Clean the hub: Once the rotor is off, thoroughly clean the hub mating surface on the wheel studs to remove any rust, debris, or old brake material.
7. Reassembly: Follow the steps in reverse order, remembering to replace any worn parts like brake pads or calipers if needed. Bleed the brakes after reassembly to remove any air introduced into the brake lines.
Important Considerations:
* Rust and corrosion: On an older vehicle like a 1989 Bronco II, rust and corrosion are common. Penetrating oil (like PB Blaster) can be helpful in loosening seized bolts and caliper pins. Give it time to work its way in.
* Caliper rebuild: While you have the caliper off, consider inspecting it and replacing the seals and boots if they're worn or damaged to prevent brake fluid leaks.
* Brake fluid: If you disconnect the brake line, you'll likely lose some brake fluid. Replenish the fluid in the master cylinder reservoir as needed.
* Brake pad thickness: Check your brake pads' thickness while you have the caliper off. They should be replaced if they're worn down.
This is a general guide. Refer to a repair manual specific to your 1989 Ford Bronco II 4x4 for precise instructions and torque specifications. If you're uncomfortable performing this repair yourself, it's best to take it to a qualified mechanic.
