What you'll need:
* Brake fluid: Use the correct type specified in your owner's manual. DOT 3 is common, but check your manual. Get fresh fluid, as old fluid can absorb moisture and compromise braking performance.
* Bleeding wrench: This is a wrench that fits over the bleeder valve (usually 8mm or 10mm). A wrench with a hose attachment is ideal to capture the fluid.
* Clear tubing: About 2 feet long, to attach to the bleeder valve and run into a container.
* Container: To catch the used brake fluid.
* Wrench (optional): A second wrench may be helpful to hold the bleeder valve steady, preventing it from being rounded off.
* Assistant: Having someone pump the brake pedal makes the process much easier.
* Gloves: Brake fluid is corrosive.
* Shop towels or rags: To clean up any spills.
Steps:
1. Locate the bleeder valves: These are typically located on top of each brake caliper (front brakes) and on the rear wheel cylinders (rear brakes). They're small, usually hexagonal, and have a small pipe fitting on them. Your owner's manual should have a diagram. The order in which you bleed them is generally: Rear passenger side, rear driver side, front passenger side, front driver side. This order is based on distance from the master cylinder and helps ensure complete bleeding.
2. Prepare the system: Make sure the brake fluid reservoir is topped off with fresh fluid.
3. Attach the tubing and container: Attach one end of the clear tubing to the bleeder valve and submerge the other end into the container.
4. Have your assistant pump the brake pedal: Instruct your assistant to firmly pump the brake pedal several times, then hold it down.
5. Open the bleeder valve: Slowly open the bleeder valve with the bleeding wrench. You should see brake fluid flowing into the container. Air bubbles will also be visible.
6. Close the bleeder valve: Once the flow of fluid becomes steady (with minimal bubbles), close the bleeder valve firmly.
7. Repeat: Have your assistant release the brake pedal and repeat steps 4-6 several times until no more air bubbles are visible in the fluid.
8. Repeat for each wheel: Repeat steps 3-7 for each wheel, in the correct order mentioned above.
9. Check the master cylinder: As you're bleeding, keep an eye on the brake fluid level in the master cylinder and add more fluid as needed to prevent introducing air into the system.
10. Test the brakes: Once all wheels are bled, test the brakes carefully in a safe area. If the pedal feels spongy or you don't have firm braking, you may need to re-bleed the brakes.
Important Considerations:
* ABS Systems: If your Cheyenne has an Anti-lock Braking System (ABS), bleeding the brakes can be more complex. You might need a specialized scan tool to properly bleed the ABS system. Consult a professional if you're unsure.
* Power Brakes: Ensure the engine is running during the process for power assist.
* Spills: Be careful not to spill brake fluid on painted surfaces, as it can damage the paint.
If you are uncomfortable performing this procedure, it's always best to have a qualified mechanic bleed your brakes. Improperly bled brakes can be dangerous.
