Tools You'll Need:
* Brake fluid: Use DOT 3 brake fluid, or the type specified in your owner's manual.
* Clear tubing: A length of clear plastic tubing to fit snugly over the bleeder valve.
* Wrench: The correct size to fit the bleeder valve on your calipers. This is usually a 8mm or 10mm, but check yours to be sure.
* Container: To collect the old brake fluid.
* Shop rags or paper towels: To clean up any spills.
* Assistant: To pump the brake pedal.
Procedure:
1. Safety First: Wear safety glasses to protect your eyes from brake fluid splashes. Brake fluid is corrosive and can damage paint. Work in a well-ventilated area.
2. Locate the Master Cylinder: The master cylinder is typically located under the hood, near the firewall. It's the large, cylindrical component with brake lines leading to it.
3. Check Fluid Level: Make sure the master cylinder reservoir is full of brake fluid. Top it off if needed.
4. Bleeding the Master Cylinder (Indirect Method): Unlike some vehicles where you directly bleed the master cylinder, the 1994 Silverado (and many others) requires bleeding the wheel cylinders or calipers first. Bleeding the master cylinder itself is usually unnecessary and can't be done directly. Air is typically purged through the wheel cylinders/calipers.
5. Bleeding the Wheels (Calipers/Wheel Cylinders): Start with the furthest wheel from the master cylinder (usually a rear wheel).
* Attach the tubing: Attach one end of the clear tubing to the bleeder valve and the other end to your container.
* Open the bleeder valve slightly: Have your assistant slowly and firmly pump the brake pedal several times. Then, hold the pedal down while you open the bleeder valve. You should see brake fluid coming out of the tube. This process pushes air bubbles out.
* Close the bleeder valve: Once the flow of fluid is steady and no more air bubbles are visible, close the bleeder valve.
* Repeat: Repeat this process for each wheel, starting with the furthest and working your way closer to the master cylinder. The order is typically Rear Passenger, Rear Driver, Front Passenger, Front Driver. Follow the order recommended in your owner's manual.
6. Check Fluid Level: Check the master cylinder reservoir frequently and top it off as needed throughout the bleeding process. Low fluid can introduce air into the system.
7. Check Brake Pedal: After bleeding all wheels, have your assistant pump the brake pedal several times. The pedal should feel firm. If not, repeat the bleeding procedure.
8. Test Drive: After bleeding, carefully test your brakes in a safe, controlled environment. Ensure the brakes are functioning correctly before driving on public roads.
Important Considerations:
* ABS System: If your truck has an Anti-lock Braking System (ABS), you'll likely need a specialized ABS bleeding tool or a scan tool to properly bleed the system. Bleeding the ABS system is more complex and requires specific procedures, sometimes requiring professional assistance.
* If you are uncomfortable working on your vehicle's brakes, take it to a qualified mechanic to have them bled properly. Improperly bled brakes are extremely dangerous.
This procedure should resolve most air in your brake lines. If problems persist, there may be other issues such as a leak in the brake system or a faulty master cylinder requiring professional attention.
