How to Bleed & Replace Brake Fluid on a 2020 Polaris Sportsman 570 EPS

Shop parts for a 2020 Polaris SPORTS570EPS ATV.

This MotoSport guide walks you through safely draining, replacing, and bleeding the brake fluid on a 2020 Polaris Sportsman 570 EPS. Follow each step carefully; brakes are a critical safety system. If you're uncomfortable with any step, consult a qualified technician or your MotoSport service partner.

What you need

  • Manufacturer-specified brake fluid (use DOT 4 unless your owner–s manual specifies otherwise)
  • Clear hose that fits bleed nipples
  • Catch bottle for old fluid
  • Rubber gloves & safety glasses
  • Clean rags and isopropyl alcohol for cleanup
  • 7mm/8mm or appropriate wrench for bleed nipples
  • Brake bleeder tool or vacuum pump (optional but recommended)
  • Hydraulic jack or ATV lift and stands (if removing wheels)
  • Torque wrench (for caliper/wheel bolts if removed)

Safety & model-specific notes for the Sportsman 570 EPS

  • EPS (Electric Power Steering) components sit near the front steering & brake lines. Avoid spilling brake fluid on electrical connectors & motor housings &mdash brake fluid is corrosive to paint & some plastics.
  • Confirm whether your particular MMY Sportsman has any factory ABS or electronic brake modules. If ABS is present, bleeding can require a scan-tool cycle or dealer procedure &mdash contact MotoSport service for assistance.
  • The Sportsman 570 uses a single master cylinder feeding front and rear circuits. Bleed starting with the wheel furthest from the master cylinder and finish nearest.
  • Work in a clean, well-ventilated area and keep contamination out of the brake fluid reservoir &mdash moisture will drastically reduce braking performance.

Preparation

  1. Park ATV on level ground, engage parking brake, remove key. Block wheels to prevent movement.
  2. Clean around the brake fluid reservoir cap to prevent dirt falling in. Remove cap and diaphragm; leave cap loose so pressure can vent.
  3. Top reservoir with new DOT 4 fluid to the maximum line. Keep the bottle capped between uses to avoid moisture pickup.
  4. If accessing bleed nipples is tight, safely raise the ATV and remove wheels to reach calipers easily.

Bleeding sequence

The general sequence: begin with the wheel furthest from the master cylinder and proceed to the nearest. On most Sportsman setups that sequence is: rear passenger side (furthest), rear driver side, front passenger side, front driver side (nearest). Confirm visual routing on your unit before starting.

Two-person manual bleed method

  1. One person pumps the brake lever/pedal slowly 3–4 times and holds pressure.
  2. Second person loosens the bleed nipple with the wrench (about a 1/4 turn) and lets fluid run into the clear hose into the catch bottle. Close nipple before the lever/pedal returns to the handlebar/foot to avoid drawing air back in.
  3. Repeat pump-hold-open-close cycles until clean, bubble-free fluid appears and no air rises in the hose.
  4. Keep the master reservoir topped up at all times to prevent sucking air into the system.
  5. Proceed to the next wheel following the sequence above.

Vacuum or pressure bleeder method (preferred for one-person jobs)

  1. Attach clear hose and vacuum pump or pressure bleeder per tool instructions.
  2. Open bleed nipple and allow pump to draw fluid until clear, air-free fluid flows. Close nipple and move to next wheel.
  3. Periodically check and top the reservoir to maintain fluid level.

Gravity bleeding (slow method)

If you lack tools, open each bleed nipple slightly and let fluid drip slowly until clear &ndash this is slow and requires care to keep the reservoir topped off. Not recommended if you need to remove significant air quickly.

Refill, cleanup & reassembly

  1. When all wheels are bled, ensure the reservoir is filled to the correct level and reinstall the diaphragm and cap securely.
  2. Wipe any spilled fluid immediately with isopropyl alcohol and clean rags. Inspect EPS connectors and painted surfaces for contamination; rinse with clean water if necessary and dry.
  3. If you removed wheels, reinstall and torque wheel and caliper bolts to factory specs if known. If unsure of torque values, consult MotoSport service.

Final checks

  • With ATV on level ground, press the brake lever/pedal several times to confirm a firm, consistent feel. There should be no sponginess.
  • Inspect bleed nipples and lines for leaks during a short, low-speed test ride in a safe area. Recheck fluid level after the test and top if required.
  • Properly dispose of old brake fluid per local regulations &mdash do not pour down drains or onto ground.

Troubleshooting & tips

  • Persistent spongy brake feel after bleeding indicates air left in the system or a leak. Re-bleed and inspect lines, hoses, fittings, and the master cylinder for leaks.
  • If brake pedal drops slowly under pressure, suspect internal master cylinder issues. Replace or rebuild rather than repeatedly bleeding.
  • Use only fresh, unopened brake fluid from a sealed container. Brake fluid is hygroscopic &ndash old fluid will absorb moisture and reduce braking performance.
  • Label the fluid change date on your service log. MotoSport recommends replacing brake fluid every 1–2 years depending on use and exposure to moisture.

When to call MotoSport service

Contact MotoSport service if you find contamination in the system, suspect ABS/electronic module involvement, experience persistent pedal issues after bleeding, or prefer a professional bleed with proper torque specs and inspection.

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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.