Here's what you need to do:
1. Safety First: Do not attempt to drive the vehicle under any circumstances. It's extremely dangerous.
2. Get Brake Fluid: Purchase DOT 3 brake fluid. Do not use any other type of fluid. Using the wrong fluid can severely damage your brake system.
3. Locate the Master Cylinder: It's usually located under the hood, near the firewall.
4. Add Brake Fluid: Carefully remove the master cylinder cap (if it's still off) and add brake fluid to the reservoir until it's near the "full" line. Do not overfill.
5. Bleeding the Brakes: This is crucial and usually requires two people. You'll need a wrench and a clear tube to bleed each wheel. The bleeding order is generally: Rear passenger side, rear driver side, front passenger side, front driver side. (Consult your Aerostar's repair manual for the precise bleeding order, as it can vary.)
* How to bleed: One person sits in the driver's seat and pumps the brake pedal slowly and firmly. The other person opens the bleeder valve (usually a small valve on the caliper) to allow air and fluid to escape into the clear tube (submerged in a container of brake fluid to prevent air from entering). The brake pedal will go to the floor when the valve is open. Close the bleeder valve as soon as the brake pedal is pressed down. Repeat this process until no more air bubbles are visible in the tube. Tighten the bleeder valve firmly after each wheel is bled.
6. Check Brake Fluid Level: After bleeding, check the master cylinder fluid level and add more if necessary.
7. Test the Brakes: Have someone help you test the brakes in a safe, open area, away from traffic. Start slowly and check for firmness and responsiveness.
Important Considerations:
* Repair Manual: Consult a repair manual specific to your 1994 Ford Aerostar. This will provide detailed diagrams and instructions.
* Professional Help: If you're not comfortable bleeding your brakes, it's best to take your vehicle to a qualified mechanic. Bleeding brakes improperly can lead to further damage.
* Low Fluid: The fact that your brake fluid was completely gone suggests a possible leak in the system. After bleeding the brakes, closely inspect all brake lines, calipers, and wheel cylinders for leaks.
* Master Cylinder Failure: It is possible the master cylinder itself is failing. If you continue to have brake problems after bleeding, it may need to be replaced.
Driving with no brakes is extremely dangerous and illegal. Have the vehicle repaired before driving it again.
