ATE 03351861002 Breather Screw/Bleeder Valve Instruction Manual

1. Product Overview

The ATE 03351861002 Breather Screw/Bleeder Valve is a critical component in a vehicle's hydraulic brake system. Its primary function is to allow for the controlled release of air and old brake fluid during the brake bleeding process, ensuring proper brake system operation and safety. This component is designed for specific applications and should be installed with precision.

Figure 1: ATE 03351861002 Breather Screw/Bleeder Valve. This image displays the metal screw with a threaded shaft and a hexagonal head, topped with a black rubber cap. The threaded section is designed to seal within the brake caliper or wheel cylinder, while the hexagonal head allows for tightening and loosening with a wrench. The rubber cap protects the valve from dirt and moisture.

2. Safety Information

Working with brake systems requires caution. Improper installation or maintenance can lead to brake failure, resulting in serious injury or death. Always adhere to the following safety guidelines:

• Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
• Ensure the vehicle is securely supported on jack stands before working underneath it.
• Use the correct tools for the job.
• Brake fluid is corrosive; avoid contact with skin, eyes, and painted surfaces. Clean up spills immediately.
• Dispose of old brake fluid responsibly according to local regulations.
• If you are unsure about any step, consult a qualified automotive technician.

3. Installation (Setup)

This section outlines the general procedure for replacing a brake bleeder screw. Always refer to your vehicle's specific service manual for detailed instructions and torque specifications.

1. Preparation: Park the vehicle on a level surface and engage the parking brake. If replacing a bleeder screw on a wheel, safely lift the vehicle and support it with jack stands. Remove the wheel.
2. Access: Locate the bleeder screw on the brake caliper or wheel cylinder. Clean the area around the bleeder screw thoroughly to prevent contaminants from entering the brake system.
3. Removal of Old Screw: Carefully loosen and remove the old bleeder screw. Be prepared for a small amount of brake fluid to leak out. If the old screw is seized, apply penetrating oil and allow it to soak, or use appropriate extraction tools. Avoid excessive force to prevent stripping threads or damaging the caliper/cylinder.
4. Installation of New Screw: Insert the new ATE 03351861002 Breather Screw/Bleeder Valve into the opening. Hand-tighten it initially to ensure proper thread engagement.
5. Torquing: Using a torque wrench, tighten the bleeder screw to the manufacturer's specified torque. Over-tightening can strip threads, while under-tightening can lead to leaks.
6. Brake Bleeding: After installation, the brake system must be properly bled to remove any air that may have entered. Follow the vehicle manufacturer's recommended brake bleeding procedure. This typically involves connecting a bleeder hose to the screw, opening the screw, and depressing the brake pedal to expel air and old fluid, then closing the screw before releasing the pedal. Repeat until no air bubbles are visible.
7. Final Checks: Inspect the bleeder screw and surrounding area for any leaks. Top up the brake fluid reservoir to the appropriate level. Reinstall the wheel (if removed) and lower the vehicle. Test the brakes in a safe area at low speed before normal operation.

4. Operation (Function within Brake System)

The ATE Breather Screw/Bleeder Valve does not have an 'operating' procedure in the traditional sense for an end-user. Its function is integral to the brake system's maintenance, specifically during the brake bleeding process. When the screw is loosened, it creates an opening that allows air and brake fluid to be expelled from the hydraulic system. When tightened, it seals the system, maintaining hydraulic pressure. Proper sealing is crucial for brake effectiveness.

5. Maintenance

Regular inspection and proper use of the bleeder screw contribute to the longevity and safety of your brake system.

• Visual Inspection: Periodically check the bleeder screw for signs of corrosion, damage, or leaks. The rubber cap should be intact and securely fitted to protect the valve from dirt and moisture.
• Brake Fluid Flush: Brake fluid should be flushed and replaced according to your vehicle manufacturer's recommendations, typically every 2-3 years. This process involves using the bleeder screws to remove old fluid and introduce new fluid.
• Cleaning: Keep the area around the bleeder screw clean to prevent debris from entering the brake system during bleeding.

6. Troubleshooting

If you encounter issues related to the bleeder screw, consider the following:

• Leaking Bleeder Screw:
  • Cause: Insufficient torque, damaged threads, or a faulty screw.
  • Solution: Ensure the screw is tightened to the correct torque specification. If threads are damaged, the screw or even the caliper/cylinder may need replacement.
• Stripped Bleeder Screw:
  • Cause: Over-tightening or using incorrect tools.
  • Solution: A stripped screw cannot be reused. It must be carefully extracted and replaced. If the threads in the caliper/cylinder are stripped, professional repair or replacement of the component is necessary.
• Difficulty Bleeding Brakes (Air in System):
  • Cause: Bleeder screw not sealing properly, air entering through other points, or incorrect bleeding procedure.
  • Solution: Verify the bleeder screw is properly seated and tightened. Re-perform the bleeding procedure carefully. If issues persist, inspect other brake system components.

For complex issues, it is recommended to seek assistance from a certified automotive technician.

7. Specifications

Key technical specifications for the ATE 03351861002 Breather Screw/Bleeder Valve:

8. Warranty Information

Specific warranty details for the ATE 03351861002 Breather Screw/Bleeder Valve are not provided in this manual. For information regarding product warranty, please refer to the original purchase documentation or contact ATE customer support or your product retailer directly.

9. Support

For technical assistance, installation guidance beyond this manual, or troubleshooting complex issues, it is recommended to:

• Consult your vehicle's official service manual.
• Contact ATE customer service through their official website.
• Seek assistance from a certified automotive technician.