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How do you decompress the brake piston on a Volvo S40?

To decompress the brake piston on a Volvo S40, follow these steps:

1. Prepare the vehicle.

- Park the vehicle on a level surface, apply the parking brake, and turn off the engine.

- Allow the vehicle to cool down if the brakes have been used heavily.

2. Locate the brake fluid reservoir.

- It is typically located in the engine bay, near the master cylinder.

3. Open the brake fluid reservoir.

- Remove the cap of the brake fluid reservoir.

4. Attach a brake hose.

- Connect one end of a clear plastic brake hose to the bleeder screw on the brake caliper.

- Submerge the other end of the hose in a container of clean brake fluid.

5. Press the brake pedal.

- Have an assistant slowly press and hold the brake pedal down.

6. Open the bleeder screw.

- Use a wrench to turn the bleeder screw counterclockwise until it is fully open.

7. Monitor the brake fluid level.

- Keep an eye on the brake fluid level in the reservoir. If it drops too low, air can enter the system and cause a spongy brake pedal.

8. Close the bleeder screw.

- Once the air bubbles stop coming out of the hose, have your assistant release the brake pedal.

- Quickly close the bleeder screw using a wrench.

9. Top up the brake fluid reservoir.

- If necessary, add brake fluid to the reservoir until it is at the proper level.

10. Test the brakes.

- Start the engine and test the brakes to make sure they are working properly.