Master Cylinder

To adjust the master cylinder on a 2000 Polaris Trail Boss 325, you can follow these steps:

1. Locate the master cylinder on the handlebars of the ATV.
2. Loosen the locknut on the brake lever's adjustment screw, which is located on the master cylinder.
3. Turn the adjustment screw clockwise or counterclockwise to adjust the position of the brake lever.
4. Test the brake lever's position by applying the brakes and making sure that the lever does not come into contact with the handlebar grip when fully applied.
5. Once the adjustment is complete, tighten the locknut on the adjustment screw to secure the adjustment.

1. Check the brake fluid level: Make sure the brake fluid reservoir is filled to the appropriate level. If the level is low, add brake fluid as needed.
2. Check the brake pads: Ensure that the brake pads are in good condition and have enough material left. If the pads are worn, replace them.
3. Check the brake lines: Look for any signs of damage or leaks in the brake lines. If you see any damage, replace the lines.
4. Bleed the brake system: Bleeding the brake system can remove any air bubbles that may be trapped in the lines and improve the system's performance. To do this, follow the instructions in your owner's manual or seek the help of a qualified mechanic.

If you have followed these steps and the brake system is still not functioning properly, you may need to replace the master cylinder. It's recommended to have a qualified mechanic inspect and diagnose the issue to ensure it is fixed correctly.