How to Bleed and Replace Brake Fluid on a 2023 Polaris Sportsman 570

Shop parts for a 2023 Polaris Sportsman 570 ATV.

This step-by-step guide from MotoSport walks you through safely replacing and bleeding the brake fluid on a 2023 Polaris Sportsman 570. Follow these instructions carefully, use proper PPE, and consult your owner’s manual for torque values and fluid specification confirmation.

What you need

  • DOT brake fluid as specified on your reservoir cap or owner’s manual (most Sportsman 570s specify DOT 4 — confirm on your machine)
  • Clear plastic tubing to fit bleed nipple
  • Catch container for old fluid
  • 7/16" or 10mm wrench for bleed nipples (verify size on your bike)
  • Syringe or turkey baster for removing old fluid from reservoir
  • Clean lint-free rags
  • Latex or nitrile gloves and eye protection
  • Jack or ramps and support stands for secure lift (if necessary)
  • Shop light and small container of denatured alcohol or brake parts cleaner for cleanup

Model notes for the 2023 Sportsman 570

  • The Sportsman 570 uses a hydraulic brake system with separate front and rear master cylinder reservoirs; front reservoir is typically located near the handlebars or on the front master cylinder, rear reservoir near the rear brake master cylinder or under the seat area. Check reservoir caps for DOT rating.
  • This model generally does not have ABS, so bleeding is done traditionally at each caliper. If your machine has electronic braking components or integrated systems, follow Polaris-specific service instructions first.
  • Brake lines are routed and secured with plastic clips that can be brittle on used machines; inspect lines and mounting hardware while you work.
  • Avoid getting brake fluid on painted surfaces or plastic panels – it will damage finish. Wipe spills immediately and rinse with water if contacted.

Preparation

  • Park on level ground, engage parking brake, and disconnect the battery negative terminal to avoid accidental starts and to prevent electrical issues while working near reservoirs.
  • Clean the reservoir caps and surrounding area to prevent contamination entering the system when you open them.
  • Remove as much old fluid from each reservoir as possible with a syringe or turkey baster without letting air enter the lines.
  • Top the reservoir with fresh DOT-specified fluid but do not overfill; keep a clear visual of fluid level during bleeding.

Bleeding order

Bleed the furthest caliper from the master cylinder first, then work toward the closest. For Sportsman 570 common sequence is:

  • Front left
  • Front right
  • Rear

Step-by-step bleeding procedure

  1. Attach clear tubing over the caliper bleed nipple and place the other end into a clear catch bottle partially filled with old brake fluid so you can see bubbles and prevent air re-entry.
  2. Have an assistant slowly pump the brake lever or pedal several times and then hold pressure on it. While pressure is held, open the bleed nipple about a quarter turn with the wrench to allow fluid and air to escape. Close the nipple before the assistant releases pressure. Repeat until no bubbles appear in the tubing and fluid runs clear.
  3. Continuously monitor reservoir level and top with fresh fluid as needed. Never let the reservoir run dry – air entering the system will require repeating the process and lengthen the job.
  4. Work through bleed order until all calipers are clear of air and fluid is clean. Finalize with the caliper closest to the master cylinder.
  5. After bleeding each caliper, torque the bleed nipple to spec (if unknown, snug to factory feel – avoid over-tightening). Wipe fittings and remove the tubing.
  6. With all calipers bled, ensure reservoir fluid is at the proper max level, reinstall caps, and clean any spilled fluid. Reconnect battery negative terminal.
  7. Check brake lever and pedal firmness. If soft or spongy, repeat bleeding process until firmness is achieved.

Replacing brake fluid (full system flush)

  • If performing a full system flush, repeatedly draw out old reservoir fluid, top with new fluid, and bleed each caliper until the expelled fluid is clean and clear. Change fluid in both front and rear systems separately as needed.
  • Dispose of used brake fluid responsibly at a recycling facility — do not pour down drains.

Post-service checks

  • Inspect all hose connections, banjo bolts, and bleed nipples for leaks at rest and after a short test ride.
  • Perform a cautious low-speed brake test in an open area to confirm stopping power and pedal feel before normal riding.
  • Re-check reservoir level after a short break-in ride and top if necessary.
  • Inspect brake pads and rotors while wheels are off for wear, glazing, or contamination from leaking fluid.

Common issues and troubleshooting

  • Persistent spongy lever: likely trapped air — repeat bleeding, ensure reservoir never ran dry.
  • Brake drag after bleeding: check caliper slide pins and pad retraction; contaminated pads may need replacement.
  • Fluid contamination or discoloration: flush full system; dark fluid reduces braking performance and corrodes components.

Maintenance tips specific to the Sportsman 570

  • Check brake fluid at regular intervals and before long rides. Riding conditions for ATVs (water crossings, mud) accelerate contamination and may require more frequent fluid changes.
  • Inspect plastic clips and line routing for chafing at suspension travel points — replace any compromised fasteners to prevent hose damage.
  • Keep replacement master cylinder and caliper hardware on hand if working in remote areas where a quick parts swap may be needed.

Perform this service with care. If you’re unsure about any step, contact a certified Polaris technician or schedule a professional service to ensure safe braking performance.

Related Shopping Categories

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Shop Brake Lines for a 2023 Polaris Sportsman 570 ATV.

Shop Brake Tools for a 2023 Polaris Sportsman 570 ATV.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.