Here's the procedure:
1. Preparation:
* Locate Bleeder Valves: These are usually located on the top of each caliper (front and rear). They're small and usually have a hexagonal head.
* Gather Supplies: Make sure you have everything you need before you start.
* Check Brake Fluid Level: Ensure the master cylinder reservoir is full of the correct brake fluid. Top it off if necessary.
* Position Your Vehicle: Park the Tahoe on a level surface with the parking brake engaged.
2. Bleeding Order (CRITICAL): The order is crucial to ensure effective bleeding. The furthest point from the master cylinder is bled first, working your way closer. The standard order for most vehicles, including the 1999 Tahoe, is generally:
* Rear Passenger Side
* Rear Driver Side
* Front Passenger Side
* Front Driver Side
3. Bleeding Process:
* Attach Tubing: Attach one end of the clear tubing to the bleeder valve and the other end to your container. Make sure the tubing is securely on the bleeder valve to avoid leaks.
* Have Your Helper Pump the Brake Pedal: Instruct your helper to firmly but smoothly pump the brake pedal several times.
* Open the Bleeder Valve: While your helper holds the brake pedal down, carefully open the bleeder valve with your wrench about 1/4 to 1/2 turn. This will allow brake fluid to flow through the tubing into your container. You should see a steady stream of fluid with few or no air bubbles.
* Close the Bleeder Valve: Once the flow slows to a trickle, close the bleeder valve before your helper releases the brake pedal. This prevents air from being sucked back in.
* Repeat: Repeat steps 3 and 4 several times until the fluid runs clear and free of air bubbles.
* Move to the Next Wheel: Once the first wheel is bled properly, move to the next wheel in the correct order and repeat the process.
4. Check Brake Fluid Level: After bleeding all four wheels, check the master cylinder reservoir and add fluid as needed.
5. Test the Brakes: After bleeding, test the brakes *carefully* before driving. Pump the brakes several times to ensure they feel firm. If the pedal feels spongy, there might be air still in the system and you'll need to repeat the bleeding process.
Important Considerations for a 1999 Tahoe:
* ABS System: The 1999 Tahoe might have an ABS system. Bleeding the brakes on a vehicle with ABS is more complex and often requires a specialized scan tool to properly bleed the ABS module. If you're unsure if your Tahoe has ABS or not, consult your owner's manual. If it does, take it to a professional. Improper bleeding of the ABS system can damage it.
* Power Assist: The power brake booster assists the brake pedal. Without this assistance, the pedal will feel very hard. Ensure your vehicle is running to get power brake assist.
If you are uncomfortable performing this procedure yourself, take your Tahoe to a qualified mechanic. Bleeding brakes incorrectly can lead to dangerous driving conditions. This guide provides general instructions; always consult your vehicle's service manual for specific recommendations.
