Bleed Infiniti QX60 Brakes: A Comprehensive Guide

Maintaining the optimal performance of your Infiniti QX60's braking system is paramount for safety. One crucial aspect of this maintenance is bleeding the brake fluid. Over time, brake fluid can absorb moisture, leading to a reduced boiling point and potential corrosion within the system. Air can also find its way into the brake lines, causing a spongy brake pedal and decreased stopping power. This comprehensive guide will walk you through the process of bleeding your Infiniti QX60's brake fluid, ensuring your vehicle remains safe and reliable on the road.

Understanding Brake Fluid Bleeding

Brake fluid bleeding, also known as 'bleeding the brakes', is the process of removing air and old fluid from the hydraulic brake system. The brake system relies on fluid pressure to operate. If air is present, it compresses much more readily than fluid, resulting in a spongy brake pedal and significantly reduced braking efficiency. Bleeding the brakes ensures that only incompressible fluid is present in the lines, allowing for firm and responsive braking.

When to Bleed Your Infiniti QX60 Brakes

There are several indicators that suggest it's time to bleed your Infiniti QX60's brake fluid:

• Spongy or soft brake pedal: If your brake pedal feels mushy or goes further down than usual before engaging, it's a strong sign of air in the lines.
• After brake component replacement: Whenever you replace parts like brake calipers, master cylinder, or brake lines, it's essential to bleed the system to remove any introduced air.
• Brake fluid flush: Regularly flushing and replacing brake fluid (typically every 2-3 years, or as per your Infiniti QX60's owner's manual) is a preventative maintenance measure that often includes bleeding.
• Low brake fluid level: If the brake fluid reservoir has been allowed to run very low, air may have entered the system, necessitating a bleed.
• Brake warning light: While often indicating low fluid or other issues, a persistent brake warning light might also suggest air in the system.

Tools and Materials You'll Need

Before you begin, gather the following essential tools and materials:

The Brake Bleeding Procedure for Infiniti QX60

The Infiniti QX60, like most modern vehicles, has an Anti-lock Braking System (ABS) and potentially a Brake Assist system. These systems can complicate the bleeding process slightly, as air can get trapped within the ABS module. It's generally recommended to follow a specific bleeding sequence. For most vehicles, including the QX60, the bleeding sequence starts with the wheel furthest from the master cylinder and moves closer. The typical sequence is:

1. Passenger Rear
2. Driver Rear
3. Passenger Front
4. Driver Front

Always double-check your Infiniti QX60's service manual for the definitive bleeding order, as some manufacturers may have specific recommendations.

Step-by-Step Bleeding Process:

1. Preparation

• Park your Infiniti QX60 on a level surface and engage the parking brake.
• Place wheel chocks behind the rear wheels to prevent rolling.
• Using a jack, lift the front of the vehicle and securely place jack stands under the designated support points. Repeat for the rear if necessary, though typically bleeding the rear wheels first doesn't require lifting the entire vehicle.
• Locate the brake fluid reservoir under the bonnet. It's usually a translucent plastic container near the firewall.
• Remove the reservoir cap. Clean around the cap area to prevent dirt from entering the system.
• Top up the reservoir with the correct type of new brake fluid. Do not overfill. Keep the reservoir topped up throughout the process; never let it run dry.

2. Connecting the Bleeder Kit

• Go to the passenger rear wheel (the furthest from the master cylinder).
• Locate the bleeder screw on the brake caliper or wheel cylinder. It's a small nipple with a hex head.
• Clean the bleeder screw and the surrounding area.
• Attach one end of the clear plastic tubing to the bleeder screw. Ensure a snug fit to prevent air from being drawn back in.
• Place the other end of the tubing into your catch pan or bottle, ensuring the end of the tube remains submerged in a small amount of old brake fluid. This creates a seal and prevents air from entering the system.

3. The Bleeding Action (Two-Person Method)

This is the most common and effective method, requiring two people:

• Person 1 (Inside the car): Slowly and steadily pumps the brake pedal several times (e.g., 3-5 pumps) to build pressure. Then, they hold the pedal down firmly, maintaining pressure.
• Person 2 (At the wheel): While Person 1 holds the pedal down, Person 2 uses the wrench to carefully open the bleeder screw (usually a quarter to half turn counter-clockwise).
• Observe the fluid flowing through the clear tubing. You will see old fluid and potentially air bubbles.
• Once the fluid stops flowing (or slows considerably), Person 2 quickly closes the bleeder screw before Person 1 releases the brake pedal. This is crucial to prevent air from being sucked back into the system.
• Person 1 releases the brake pedal.
• Repeat steps i-v until no more air bubbles are visible in the fluid coming from that caliper and the fluid appears clear.
• Throughout this process, constantly monitor the brake fluid level in the reservoir and top it up as needed.

4. Bleeding Other Wheels

Once the passenger rear wheel is bled, move to the next wheel in the sequence (Driver Rear, Passenger Front, Driver Front) and repeat the entire process of connecting the tubing, pumping the pedal, opening the bleeder, closing the bleeder, and releasing the pedal. Remember to keep the reservoir topped up at all times.

5. Final Checks

• After bleeding all four wheels, ensure all bleeder screws are securely tightened.
• Remove the tubing from the bleeder screws and replace any protective caps.
• Top up the brake fluid reservoir to the MAX line.
• Replace the reservoir cap securely.
• Carefully lower the vehicle.
• Pump the brake pedal several times until it feels firm and the brake lights illuminate correctly.
• Test the brakes in a safe, low-speed environment before driving at normal speeds. Check for proper pedal feel and stopping power.
• Clean up any spilled brake fluid immediately, as it can damage paint.

Alternative Bleeding Methods

While the two-person method is reliable, there are other options:

• Vacuum Bleeding: This method uses a vacuum pump attached to the bleeder screw to draw fluid and air out of the system. It can be done by a single person.
• Pressure Bleeding: A pressure bleeder attaches to the master cylinder reservoir and forces fluid through the system, pushing air and old fluid out of the bleeder screws. This is often the quickest and most efficient method.

If your Infiniti QX60 has an ABS system, some manufacturers recommend a specific procedure to cycle the ABS pump to ensure all air is purged from the ABS module. This often involves using a diagnostic scan tool. If you are unsure, consult your owner's manual or a professional mechanic.

Important Considerations and Tips

• Never reuse old brake fluid.
• Do not let the brake fluid reservoir run dry during the bleeding process. This will introduce more air into the system and undo your work.
• Brake fluid is corrosive. Avoid contact with skin, eyes, and paintwork. Wear appropriate protective gear.
• Always use the correct type of brake fluid specified for your Infiniti QX60. Mixing fluid types can damage the system.
• Bleeder screws can be fragile. Use the correct size wrench and apply steady pressure to avoid stripping them.
• If you're uncomfortable with any part of this process, it's always best to seek professional assistance from a qualified mechanic.

Frequently Asked Questions (FAQs)

Q1: How often should I bleed my Infiniti QX60's brakes?
It's generally recommended to bleed your brakes every 2-3 years as part of a routine brake fluid flush, or whenever you notice a spongy pedal or after replacing brake components.

Q2: Can I bleed my Infiniti QX60 brakes by myself?
Yes, it's possible using vacuum or pressure bleeding kits, or by using a one-way valve on the bleeder screw. However, the two-person method is the most common and often the most straightforward for DIYers.

Q3: What happens if I don't bleed my brakes?
Old brake fluid can absorb moisture, lowering its boiling point and leading to reduced braking performance, especially under heavy use (brake fade). Air in the lines will make the brake pedal feel spongy and decrease stopping power, posing a significant safety risk.

Q4: What is the correct brake fluid type for an Infiniti QX60?
Consult your Infiniti QX60 owner's manual. Most commonly, it will specify DOT 3 or DOT 4 brake fluid. Using the wrong type can damage seals and other components.

Q5: My Infiniti QX60 has an ABS system. Does this change how I bleed the brakes?
Yes, ABS systems can trap air in the ABS modulator. While the standard bleeding sequence often works, some vehicles may require a specific procedure to cycle the ABS pump, often with a diagnostic tool, to ensure all air is purged. If in doubt, refer to your vehicle's service manual or a professional.

By following this guide, you can confidently perform a brake fluid bleed on your Infiniti QX60, ensuring a safe and responsive braking system. Regular maintenance of your brakes is an investment in your safety and the longevity of your vehicle.