Tools You'll Need:
* Brake fluid: Use DOT 3 or DOT 4 brake fluid specified in your owner's manual. Never mix different types of brake fluid.
* Clear tubing: About 3-4 feet long, to connect the bleeder valve to a container.
* Wrench: The correct size to fit your bleeder valves (usually 8mm or 10mm). A line wrench is preferable to avoid rounding off the bleeder valve.
* Container: To catch the old brake fluid.
* Gloves: Brake fluid is corrosive.
* Rag or shop towel: To clean up spills.
* Assistant: To pump the brake pedal.
Procedure:
1. Jack up the car: Securely jack up the car and support it with jack stands. Never work under a car supported only by a jack.
2. Locate the bleeder valves: These are usually located on the top of each brake caliper (front and rear). Your owner's manual will show their exact location.
3. Fill the master cylinder: Make sure the master cylinder reservoir is full of fresh brake fluid.
4. Attach the tubing: Attach one end of the clear tubing to the bleeder valve and the other end to the container.
5. Bleeding Sequence: The correct bleeding sequence is crucial to ensure proper bleeding. The most common sequence is: Right Rear, Left Rear, Right Front, Left Front. Your owner's manual may specify a different sequence. Follow the manual's recommendation.
6. Bleeding Process (per wheel):
* With your assistant firmly pressing the brake pedal, slightly crack open the bleeder valve with your wrench.
* Have your assistant hold the brake pedal down.
* Close the bleeder valve once the brake fluid flow stops.
* Repeat this process until the fluid coming out of the bleeder valve is clean and free of bubbles.
* Top off the master cylinder reservoir as needed to keep it full during the process.
7. Repeat for each wheel: Follow steps 6 for each wheel in the correct sequence.
8. Check for leaks: After bleeding all four wheels, check for any leaks around the bleeder valves and brake lines.
9. Test the brakes: Carefully lower the car and test the brakes several times in a safe area. If the pedal feels soft or spongy, you may need to bleed the brakes again.
Important Considerations:
* ABS systems: If your Cadillac has an Anti-lock Braking System (ABS), bleeding the brakes may be more complex. You may need a pressure bleeder or a scan tool to properly bleed the system. Consulting a professional mechanic is recommended in this case.
* Brake fluid is corrosive: Wear gloves and clean up any spills immediately.
* Air in the brake lines can be dangerous: If you are unsure about any part of this process, consult a professional mechanic. Improperly bled brakes can lead to brake failure.
This is a general guide. Always consult your owner's manual for specific instructions for your 1998 Cadillac model. If you are uncomfortable performing this procedure yourself, it is best to take your car to a qualified mechanic. Improperly bled brakes can be dangerous.
