Air Powered Brake Caliper Piston Wind Back Tool Set Recessed Version (22 pcs)

What is the function of the piston inside the brake calipers?

The piston inside a brake caliper plays a crucial role in the braking system of a vehicle. Its primary function is to apply the necessary force to the brake pads, pressing them against the brake rotor to create friction and slow down or stop the vehicle. Here's a detailed breakdown of its functions:

1. Force Transmission: When the driver presses the brake pedal, hydraulic brake fluid is pushed through the brake lines to the brake caliper. The hydraulic pressure forces the piston(s) inside the caliper to move.

2. Pad Engagement: As the piston(s) move, they push the brake pads against the rotating brake rotor. The friction generated between the brake pads and the rotor slows down or stops the wheel's rotation.

3. Even Pressure Distribution: In multi-piston calipers, the pistons ensure that the pressure is evenly distributed across the brake pad surface, promoting even wear of the brake pads and efficient braking.

4. Retraction: After the driver releases the brake pedal, the pistons retract slightly, allowing the brake pads to move away from the rotor. This prevents continuous contact, reducing wear and tear on both the brake pads and the rotor, and eliminating drag that could affect vehicle performance.

Key Points

- Hydraulic Pressure: The pistons convert hydraulic pressure from the brake fluid into mechanical force.

- Friction Creation: The main role of the piston is to create the necessary friction by pressing the brake pads against the rotor.

- Efficient Braking: Proper function of the pistons ensures that the braking system operates efficiently and safely.

- Maintenance: Regular inspection and maintenance of the brake caliper pistons, along with the entire braking system, are essential to ensure they are free from leaks, corrosion, and other issues that can impair their function.

Overall, the pistons in brake calipers are vital components that ensure effective braking by converting hydraulic pressure into the mechanical force needed to stop the vehicle.

Why do we need to push the piston back to the brake caliper after we have replaced new brake pads?

Pushing the piston back into the brake caliper after replacing brake pads is a necessary step to ensure proper fitment and functionality of the braking system. Here are the key reasons for doing this:

1. Accommodating Thicker Pads: New brake pads are thicker than the worn ones being replaced. To make room for the increased thickness of the new pads, the pistons need to be pushed back into the caliper.

2. Proper Clearance: Retracting the piston provides the necessary clearance to fit the new pads and the caliper back over the brake rotor. Without doing this, the caliper assembly won't fit correctly, and the brake system won't function properly.

3. Ensuring Smooth Operation: Pushing the piston back ensures that it moves smoothly within the caliper bore. This is important for the even application of pressure when the brakes are engaged, leading to balanced and effective braking.

4. Preventing Brake Drag: If the piston isn't fully retracted, the new pads might remain in contact with the rotor even when the brakes are not applied, causing brake drag. This can lead to premature wear of the new pads and rotors, reduced fuel efficiency, and potential overheating of the brake components.

Steps to Push the Piston Back

1. Remove the Caliper: Remove the caliper from its mount to access the piston.

2. Use a Brake Caliper Tool: A brake caliper piston tool, such as Cosda’s SD-1350P or a C-clamp can be used to carefully and evenly push the piston back into the caliper. If using a C-clamp, place one end on the piston and the other end on the back of the caliper housing and slowly tighten it.

3. Monitor Brake Fluid Level: As you push the piston back, brake fluid in the system will be pushed back into the master cylinder. Ensure that the brake fluid reservoir does not overflow. It might be necessary to remove some fluid from the reservoir to prevent spills.

4. Inspect and Clean: Before pushing the piston back, inspect the piston and the caliper for any signs of damage or corrosion. Clean the piston to ensure smooth movement and proper function.

By following these steps and ensuring the pistons are correctly retracted, you help maintain the efficiency and safety of the braking system after replacing the brake pads.

This product holds patents and CE certificate, tested by SGS