Priming A New Brake Caliper: A Step-By-Step Guide



When it comes to ensuring the safety and performance of your vehicle, the brake system plays a crucial role. One important component of the brake system is the brake caliper, which houses the brake pads and applies pressure to the rotors to stop the vehicle. If you’ve recently replaced a brake caliper or installed a new one, it’s essential to prime it before hitting the road. Priming a new brake caliper ensures proper functionality and prevents any potential issues that could arise from air pockets or improper lubrication.

Tools and Materials Needed

1. Brake fluid

Choose a brake fluid that meets the specifications recommended by your vehicle manufacturer. Refer to your vehicle’s manual or consult with a professional if you’re unsure.

2. Clear plastic tubing

This tubing will be used to connect the brake bleeder valve to a container to collect the old brake fluid.

3. Wrench or socket set

You’ll need a wrench or socket set to remove the brake bleeder valve, which allows air and fluid to escape during the priming process.

4. Brake bleeder kit (optional)

A brake bleeder kit can make the priming process easier by providing a one-way valve that prevents air from reentering the system.

Step-by-Step Guide

Step 1: Gather the Necessary Tools and Materials

Before starting the priming process, ensure you have all the required tools and materials within reach.

Step 2: Lift and Secure the Vehicle

Use a jack to lift the vehicle and secure it on jack stands to ensure stability and safety throughout the process.

Step 3: Locate the Brake Bleeder Valve

The brake bleeder valve is typically located on the backside of the brake caliper. Clean the valve and surrounding area to prevent any dirt or debris from entering the brake system.

Step 4: Attach the Clear Plastic Tubing

Connect one end of the clear plastic tubing to the brake bleeder valve and the other end to a container to collect the old brake fluid.

Step 5: Open the Brake Bleeder Valve

Using a wrench or socket set, carefully loosen the brake bleeder valve. Be cautious not to damage the valve or strip the threads.

Step 6: Begin Priming

Have a helper slowly press the brake pedal while you observe the clear plastic tubing for any air bubbles. As the pedal is depressed, air and old brake fluid will be forced out through the tubing and into the collection container.

Step 7: Close the Brake Bleeder Valve

Once the brake pedal is fully depressed, close the brake bleeder valve to prevent air from reentering the system. Tighten the valve securely but avoid over-tightening.

Step 8: Refill with Fresh Brake Fluid

Top up the brake fluid reservoir with fresh brake fluid that meets the manufacturer’s specifications. Ensure the reservoir is filled to the recommended level.

Step 9: Repeat the Priming Process

Repeat steps 6 to 8 until you no longer observe any air bubbles in the clear plastic tubing. This ensures that all air has been removed from the brake caliper and the system is properly primed.

Step 10: Test the Brakes

Lower the vehicle from the jack stands and take it for a test drive. Gradually apply the brakes to ensure they are working correctly and that there are no issues with the newly primed brake caliper.


Priming a new brake caliper is a crucial step in maintaining the safety and performance of your vehicle’s brake system. By following this step-by-step guide, you can ensure the proper functionality of your new caliper and prevent any potential issues down the road. Remember to always consult your vehicle’s manual or seek professional assistance if you’re unsure about any aspect of the priming process. Safe driving!