How to bleed brakes on an Acura?

Bleeding the brakes on an Acura is a straightforward, step-by-step task that replaces air in the lines with fresh brake fluid, typically following the standard farthest-from-master-cylinder wheel order. This guide walks you through the tools, sequence, methods, safety considerations, and model-specific notes to help you restore a firm brake pedal.

What you need before you start

Before you begin, gather the following tools and materials to ensure a clean, safe brake bleed:

• Brake fluid compatible with your model (DOT 3 or DOT 4; check the reservoir cap or owner's manual).


• New brake fluid in a sealed bottle; keep the container closed when not in use.


• Clear plastic tubing that fits the bleeder valve.


• Wrench appropriate for the bleeder screws (usually 8 mm or 10 mm).


• Catch bottle and clean rags for spills.


• Brake bleeder kit or a vacuum/pressure bleeder, or a helper for the two-person method.


• Wheel chocks, jack stands, and a floor jack; ensure the car is secure.


• Personal protective equipment (gloves, eye protection).

Having these items ready helps maintain a clean work area and prevents contamination of the brake fluid, which can compromise braking performance.

Bleed sequence for most Acura models

Most Acura models follow the standard farthest-to-nearest bleed order from the master cylinder. Use this sequence unless your owner's manual specifies a different order for your model or AWD configuration. If you have a service manual, confirm the exact order for your year and drivetrain.

1. Right rear wheel (RR)


2. Left rear wheel (LR)


3. Right front wheel (RF)


4. Left front wheel (LF)

Recapping the sequence helps ensure any trapped air is expelled from the brake system starting from the furthest point. Once you complete the sequence on all four corners, proceed to a final check and test drive.

Bleeding methods

Choose a bleeding method that suits your setup. Below are two common approaches: a two-person manual bleed and using a pressure or vacuum bleeder. Each method requires the same wheel order and similar per-wheel steps.

• Two-person manual bleed: one person depresses the brake pedal slowly while the other opens and closes the bleeder valve to allow air and fluid to escape.


• Pressure or vacuum bleed: connect a bleeder device to the valve, apply pressure or pull a vacuum, and open the valve to vent air until fluid runs clear.

Regardless of method, keep the master cylinder reservoir filled to prevent drawing air into the lines. After completing each wheel, top off fluid as needed and wipe away any spills.

Step-by-step bleeding procedure

Proceed wheel by wheel in the recommended order. Below are comprehensive steps that apply to both manual and assisted bleeding methods.

1. Support the car safely, remove the wheel, and locate the bleeder valve on the caliper (or wheel cylinder).


2. Attach the clear tubing to the bleeder valve and submerge the other end in a catch bottle with a small amount of brake fluid to prevent air from entering.


3. Open the master cylinder reservoir cap, and if you’re working with a wet or low fluid level, top off with fresh brake fluid as needed.


4. For manual bleeding: have a helper slowly press the brake pedal to the floor, then hold it. Loosen the bleeder valve just enough to let fluid and air escape, then close the valve before the pedal returns. For a bleed using a device: follow the device instructions to maintain steady flow while the valve is opened.


5. Close the bleeder valve and have your helper release the pedal; repeat until you see clear, bubble-free fluid in the hose. Move to the next wheel in the order after finishing each wheel.


6. Wipe the area clean, inspect for leaks, and reattach the wheel and lug nuts to spec torque once you finish bleeding all corners.

After bleeding, check the brake pedal for firmness by pressing it with the engine on and the wheel chocks in place, and perform a careful road test at low speed in a safe area to confirm braking performance.

ABS and safety considerations

Modern Acura braking systems include an ABS modulator that can complicate bleeding if air is trapped in the lines. If you notice a soft or spongy pedal after bleeding or the ABS warning light is on, consider one of these options: re-bleed with the ABS pump cycling or consult a professional. Always avoid contaminating the brake fluid with dirt or water, and never reuse old fluid.

Tips for avoiding common issues

Keep the following tips in mind to prevent common problems during bleeding: work with clean fluid, avoid letting the reservoir run dry, check for leaks at each caliper, and ensure a steady bleed rate. If the pedal remains spongy after two rounds of bleeding, seek professional help.

Fluid type and model specifics for Acura

Most Acura models use DOT 3 or DOT 4 brake fluid. Check the owner’s manual or the reservoir cap for the correct specification for your year and drivetrain, as some hybrids or performance variants may have specific requirements. Do not mix different types of brake fluid, and replace the entire reservoir volume if you suspect contamination.

Summary

Bleeding the brakes on an Acura is a manageable maintenance task when you follow the correct wheel sequence, use the proper brake fluid, and choose a bleeding method that suits your setup. With careful attention to safety, the process will restore firm, reliable braking feel. If in doubt, consult a professional mechanic, especially if the ABS warning light appears or if you encounter persistent air in the system.

How do you bleed air out of an ABS system?

To get air out of an ABS system, you can use a special scan tool to activate the ABS module while performing a standard brake bleed, or use a two-step method of manually bleeding the brakes and then activating the ABS by braking hard, followed by another manual bleed if needed. For the best results and safety, using a diagnostic scan tool is recommended as it can cycle the ABS pump and valves.
 
Method 1: Using a scan tool (recommended)

1. Connect the scan tool: Hook up a compatible scan tool to your vehicle's OBD-II port. 
2. Select "Brake Bleed" or "ABS Bleed": Navigate through the tool's menu to the brake bleed or ABS bleeding service function. 
3. Follow the on-screen instructions: The tool will guide you through the process, which may involve several steps: 
   • Connecting tubing: Attach a clear tube to each bleeder valve, running to a catch container. 
   • Pumping brakes: The tool may instruct you to pump the brake pedal or will activate the ABS pump itself. 
   • Opening/closing valves: You will be told when to open the bleeder valve, and then when to close it before releasing the pedal or the tool continues the cycle. 
   • Maintaining fluid level: Keep the master cylinder reservoir filled with the correct brake fluid throughout the process. 
4. Bleed all four wheels: Complete the sequence for all four wheels in the order specified by the tool (this varies by manufacturer). 

Method 2: Without a scan tool
 

1. Perform a standard manual brake bleed: Bleed the brakes as you normally would to remove the majority of the air. 
2. Activate the ABS: Find a safe, open area and drive the vehicle. Slam on the brakes forcefully enough to engage the ABS (you'll feel and hear it). 
3. Repeat activation: Do this a few times to force the air from the ABS module into the lines. 
4. Re-bleed the brakes: After activating the ABS, check the brake pedal. If it feels soft, repeat the manual brake bleeding process to remove any new air that has been displaced from the ABS module. 
5. Tighten bleeder valves: Ensure all bleeder valves are properly tightened after bleeding. 

Important safety considerations

• Always have an assistant or use a tool to press and hold the brake pedal when instructed during the manual bleed. 
• Monitor the brake fluid level in the master cylinder to prevent more air from entering the system. 
• When activating the ABS by braking hard, ensure you have a very safe and clear area to do so, and be aware of the reduced braking capability caused by air in the lines. 
• If you are unsure or the problem persists, it is best to consult a professional. 

How do I bleed my brakes by myself?

To bleed your brakes by yourself, start by filling the master cylinder with fresh brake fluid. Next, use a clear hose attached to the bleeder screw of the wheel furthest from the master cylinder and submerge the other end in a container with brake fluid. Loosen the bleeder screw and pump the brake pedal to push fluid through, then close the screw before releasing the pedal, repeating until no air bubbles are seen. 
Step 1: Prepare and position the vehicle 

• Safely raise the vehicle and remove the wheels for better access. 
• Locate the brake bleeder screw on each brake caliper. 
• Fill the master cylinder reservoir with fresh, correct-type brake fluid. Do not let the reservoir become empty during the process, as this will introduce air into the system. 

Step 2: Attach the hose and container 

• Use a clear, flexible hose and attach one end to the bleeder screw. 
• Place the other end of the hose into a bottle or container. 
• For the "bleed bottle" method, fill the container with brake fluid, place the hose into the bottle, and drill a small vent hole in the cap to prevent pressure buildup. 

Step 3: Bleed the brakes 

• Begin with the wheel farthest from the master cylinder, which is typically the rear-right wheel. 
• Loosen the bleeder screw about a quarter turn. 
• Pump the brake pedal slowly and repeatedly. 
• When the pedal is near the floor, close the bleeder screw before releasing the pedal. 
• Repeat this process until a steady stream of clear fluid with no air bubbles comes out. 
• Move to the next wheel and repeat the process until all brakes are bled. 

Step 4: Final checks

• Check the master cylinder reservoir and top off the brake fluid if necessary. 
• Pump the brake pedal several times and ensure it feels firm and consistent. 
• Replace the bleeder screw cap and put the wheels back on the vehicle. 

How do I get air out of my brake system?

To get air out of brakes, you need to bleed the brakes by having a partner press and hold the brake pedal while you open and close the bleeder valve on the wheel. Repeat this process until a steady stream of fluid without bubbles comes out, making sure to keep the master cylinder reservoir full throughout the procedure. Start with the brake furthest from the master cylinder and move to the closest one.
 
Step-by-step guide

1. Park and prepare: Park the vehicle on a level surface and locate the bleeder valves on each wheel's brake caliper or wheel cylinder. 
2. Gather tools: You will need a wrench, clear tubing, and a container to catch the old brake fluid. 
3. Fill the master cylinder: Ensure the master cylinder reservoir is filled to the "max" line with new brake fluid. 
4. Start bleeding:
   • Place a clear hose over the bleeder valve and put the other end in a collection container. 
   • Loosen the bleeder valve with your wrench. 
   • Have your partner pump the brake pedal a few times and then press it down firmly and hold it. 
   • While the pedal is held down, open the bleeder valve to release air and fluid. You will see bubbles in the clear tubing. 
   • Before your partner releases the pedal, tighten the bleeder valve. This is a crucial step to prevent air from re-entering the system. 
   • Have your partner slowly release the brake pedal. 
5. Monitor and repeat:
   • Keep an eye on the master cylinder and add more fluid as needed to prevent it from running dry, which would introduce more air. 
   • Repeat the pumping and bleeding process at the same wheel until the fluid flowing out is clear and has no air bubbles. 
6. Move to the next wheel: Once one wheel is bled, move to the next wheel, following the correct order. The general rule is to start with the wheel furthest from the master cylinder and work your way closer. 
7. Finish up:
   • After bleeding all four wheels, make sure all bleeder valves are tight. 
   • Fill the master cylinder one last time and put the cap back on. 
   • Test the brake pedal to ensure it feels firm. 
   • Carefully test drive the vehicle at a low speed to confirm the brakes are working correctly. 

Do you bleed your brakes with the car running or off?

You should bleed your brakes with the car off. The engine must be off to prevent the ABS pump from activating, which can interfere with the bleeding process and is not necessary for a manual bleed. Turning the engine on can make the brake pedal feel softer due to the power-assist, but it can also push air into the lines from the ABS module. 
This video demonstrates how to bleed brakes with the engine off: 51sStevestonmotorcoYouTube · Aug 10, 2019

• Turn the engine off. This is the most critical step to ensure proper bleeding. 
• Ensure the brake pedal is firm. When the engine is off, the pedal will be harder to push, which is the correct feel needed for the bleeding process. 
• Prevent ABS activation. With the engine off, you avoid the risk of the ABS pump interfering with the removal of air and fluid from the system. 
• Don't release the pedal until the bleeder valve is closed. You must close the bleeder valve before the assistant releases pressure on the pedal to prevent air from being sucked back into the brake line.