How to Bleed and Replace Brake Fluid on a 2016 Polaris Sportsman 570 SP

Shop parts for a 2016 Polaris Sportsman 570 SP ATV.

This MotoSport guide shows how to flush and bleed the brake system on a 2016 Polaris Sportsman 570 SP so you keep consistent stopping power and prevent moisture-related corrosion in the hydraulic system. Follow these steps carefully, use recommended fluid, and observe safety precautions.

What you need

  • Factory-specified DOT 4 brake fluid (only use the fluid specified by Polaris)
  • Brake bleeder kit or clear hose and catch bottle
  • Box-end wrench set (bleeder nipples typically 8mm or 10mm)
  • Turkey baster or fluid transfer syringe
  • Clean rags and brake cleaner
  • Gloves and eye protection
  • Service manual or repair torque specs for fasteners (recommended)
  • Optional vacuum pump or pressure bleeder for single-person operation

Model-specific notes for the 2016 Sportsman 570 SP

  • The Sportsman 570 SP uses a hydraulic braking system with separate master assemblies for front and rear circuits but they can be linked by Polaris’ brake plumbing layout; always confirm which master reservoir feeds which calipers before bleeding.
  • The master reservoirs are accessible under the front panel and near the driver's area; use care removing panels so you don’t crack plastics or damage wiring connectors.
  • Park brake and parking pawl components are mechanical — they do not replace the need for properly bled hydraulic brakes. Ensure mechanical parking brake functions after service.
  • If your unit has aftermarket accessories (winches, racks, lighting) that change front weight distribution, recheck brake feel after a short test ride.
  • Corrosion on bleeder screws is common on older ATVs; apply penetrating lubricant and work carefully to avoid rounding the nipple head.

Safety and preparation

  • Work on a level surface with the engine off and key removed. Chock wheels and secure the Sportsman on a stand so wheels can spin freely where required.
  • Brake fluid damages paint and plastics — cover panels and wipe spills immediately with clean rags and water if DOT 4 allows dilution, then wipe dry. Dispose of old fluid at a proper recycling facility.
  • Do not mix DOT 4 with silicone-based or mineral-brake fluids; always use new, sealed brake fluid.

Step-by-step: Replace and bleed brake fluid

The procedure below assumes you will replace all fluid in the system. If you only bleed a single circuit, adapt accordingly. Two-person and vacuum-assisted single-person methods are provided.

1. Inspect and access

  • Remove trim panels to expose master cylinder reservoirs. Clean the reservoir caps and surrounding area before opening to prevent contamination.
  • Check the reservoir condition — replace any brittle or cracked reservoir or hoses before proceeding.

2. Remove old fluid from reservoirs

  • Use a turkey baster or fluid syringe to remove as much old fluid as possible from each reservoir. Do not reuse the fluid.
  • Top reservoirs with fresh DOT 4 fluid to the fill line to prevent introducing air once you begin bleeding.

3. Identify bleed order

  • General hydraulic principle: bleed the caliper farthest from the corresponding master cylinder first, then progress to the nearest. For many ATVs this means: rear caliper(s) before front calipers for the rear master, and the opposite for the front master if separate. Confirm which master feeds which caliper on your Sportsman 570 SP before starting.
  • If the system is combined or has plumbing runs that cross, follow the service manual sequence or: farthest rear caliper, nearest rear caliper, farthest front caliper, nearest front caliper.

4. Two-person bleed method (recommended for reliability)

  • Person A keeps the brake lever/pedal depressed or holds it in a steady applied position while Person B opens and closes bleed screws.
  • Attach a clear hose to the bleeder nipple and route into a catch bottle partially filled with clean fluid to prevent drawing air back in.
  • With Person A lightly holding the lever/pedal applied, Person B opens the bleeder screw 1/4 to 1/2 turn — fluid and air will flow into the bottle. Close the screw before Person A releases the lever/pedal. Repeat until no air bubbles appear and fluid runs clean and fresh.
  • Top up the reservoir frequently; never let it drop below the minimum level or you will reintroduce air.
  • Work through the bleed sequence until all calipers are clear of air.

5. One-person vacuum or pressure bleed method

  • Use a hand vacuum pump at the bleeder nipple or a pressure bleeder on the reservoir. This allows single-person bleeding and is faster, especially when flushing all fluid.
  • Operate the vacuum pump until clear fluid runs with no bubbles. Keep reservoir topped while the vacuum system draws fluid through.
  • If using a reservoir pressure bleeder, pressurize to the recommended psi, open bleeders in sequence, then release pressure and tighten bleeders when finished.

6. Final flush (full-system replacement)

  • To fully replace fluid, continue bleeding each caliper until fresh fluid appears at the bleeder and reservoir shows no contamination. Repeat system cycles as necessary.
  • When complete, ensure all bleeder screws are tightened to firm snugness. If you don’t have torque specs, tighten gently to avoid rounding — consult the service manual for exact torque values.

7. Check pedal/levers and test ride

  • With the engine off, pump the brakes several times to build firmness. The lever/pedal should feel firm and not spongy. If spongy, recheck for air or leaks.
  • Inspect around calipers, lines, fittings, and the master reservoir for leaks.
  • Lower the machine and perform a low-speed test ride in a safe area to confirm proper braking performance. Recheck fluid level and retighten bleeders after the first ride if needed.

Troubleshooting and tips

  • Persistent soft brake feel: likely trapped air, collapsed flexible hose, or a faulty master cylinder. Replace suspect hoses and retest.
  • Stubborn bleeder screws: apply penetrating oil and work back and forth. If rounded, a proper extractor or replacement caliper may be necessary.
  • Brake drag after service: ensure caliper pistons are fully seated and that you didn’t overfill the system causing pressure or that pads aren’t sticking.
  • Store DOT 4 brake fluid sealed and in a cool, dry place; it absorbs moisture quickly once opened.

Maintenance schedule recommendations

  • Replace brake fluid every 1 to 2 years or sooner if the fluid appears dark or contaminated. Riding in wet, salty, or muddy conditions speeds moisture ingress and corrosion.
  • Regularly inspect lines, fittings, and pads for wear and damage as part of seasonal maintenance.

Performing a proper brake fluid change and bleed on your 2016 Polaris Sportsman 570 SP ensures reliable stopping, extends component life, and improves safety. If you’re unsure about the bleed sequence for your specific plumbing layout or encounter major component issues, contact a certified Polaris technician or bring your unit to a shop for professional service.

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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.