How to Bleed and Replace Brake Fluid on a 2019 Polaris Sportsman 570 EPS

Shop parts for a 2019 Polaris Sportsman 570 EPS ATV.

This MotoSport-exclusive guide walks you step-by-step through safely flushing and replacing the brake fluid on a 2019 Polaris Sportsman 570 EPS. Follow these instructions precisely, use recommended fluids and tools, and consult the service manual for torque specs or model-specific tolerances.

What you need

  • DOT 4 brake fluid (Polaris specifies DOT 4; do not mix with DOT 5 silicone)
  • Clear tubing and a catch bottle
  • Turkey baster or fluid syringe (for removing old fluid from reservoir)
  • Box wrench or socket set for bleed nipples
  • Vacuum or pressure brake bleeder (recommended) or a helper for manual pump-bleed
  • Brake-cleaner, shop rags, gloves and safety glasses
  • Torque wrench (for reinstalling caliper/banjo bolts per manual)
  • Zip-ties or clamps to hold tube on bleed nipple

Model-specific notes for the 2019 Polaris Sportsman 570 EPS

  • The Sportsman 570 EPS uses a hydraulic master cylinder with a single reservoir feeding front and rear circuits. The EPS (electronic power steering) is unrelated to the brake hydraulic system but keep steering centered while bleeding front brakes to avoid tension in hoses.
  • There is no factory ABS on the 2019 Sportsman 570 EPS; bleed procedures are conventional hydraulic bleeds.
  • Brake hose routing and bleed nipple locations: bleed nipples are on the calipers (front left and right calipers, rear caliper). Identify the farthest caliper from the master cylinder to set bleed order.
  • Inspect banjo bolt crush washers when disconnecting brake lines; replace crush washers if disturbed or leaking.
  • After bleeding, check brake lever and pedal free-play and adjust per the manual; test in a controlled environment before riding.

Safety first

  • Work on a level surface; secure the ATV with the parking brake and wheel chocks.
  • Protect painted surfaces from brake fluid – it will damage paint. Clean spills immediately with brake-cleaner and water.
  • Wear gloves & safety glasses. Dispose of old brake fluid responsibly.

Prep steps

  1. Warm the brake fluid slightly by running the engine briefly — warm fluid flows and bleeds easier. Turn engine off before working on the system.
  2. Clean around the master-cylinder reservoir cap, then remove the cap and diaphragm to prevent contamination.
  3. Siphon or use a turkey baster to remove as much old fluid from the reservoir as possible without introducing air through the lines.
  4. Refill the reservoir with fresh DOT 4 fluid to the upper mark. Keep the cap and diaphragm nearby but do not reinstall until initial topping is finished.
  5. Park the steering centered; support wheels off the ground on jack stands if you plan to open calipers or to actuate wheels freely.

Bleeding sequence (recommended)

Bleed the system starting with the caliper farthest from the master cylinder and finish with the closest. For many Sportsman layouts that means: rear caliper(s) first, then front calipers. If two rear wheels, start with the rear wheel farthest from the master cylinder. Always confirm which caliper is farthest on your machine and follow that order.

Bleeding methods

1) Vacuum or pressure bleeder (recommended)

  1. Attach clear tubing to the caliper bleed nipple and the other end into a catch bottle partially filled with old fluid to prevent air re-entry.
  2. Open the bleed nipple about 1/4 turn. If using a vacuum pump at the nipple, pull fluid until fresh fluid appears and no bubbles are present. If using pressure bleeder on the reservoir, pressurize per tool instructions and open each nipple until clear fluid flows.
  3. Keep the master-cylinder reservoir topped while bleeding to avoid drawing air into the system.
  4. Tighten the bleed nipple to spec (or snug) when no bubbles appear, then move to the next caliper in your sequence.

2) Two-person pump-bleed

  1. Person A pumps the brake pedal/lever slowly 6-8 times and holds pressure on the pedal/lever.
  2. Person B opens the bleed nipple slightly until fluid and air exit, then closes the nipple before Person A releases the pedal/lever.
  3. Repeat until no air bubbles appear and pedal/lever feels firm. Keep topping the reservoir to avoid drawing air in.

3) One-person manual method (syringe or squeeze bottle)

  1. Attach tube to the bleed nipple and submerge into a catch bottle. Use a syringe to pull fluid through the system from the caliper end while topping the reservoir.
  2. Work each caliper until no air bubbles appear.

Detailed caliper bleed steps

  1. Start with the farthest caliper. Clean the bleed nipple area and attach clear tubing. Place tubing into a catch bottle with some old fluid.
  2. Crack the bleed nipple one-quarter to half turn. Using your chosen method, evacuate fluid until clear, bubble-free fluid flows.
  3. Tighten the bleed nipple while pressure is applied or immediately after fluid flow stops to avoid sucking air back in.
  4. Wipe the area clean and move to the next caliper. Always check reservoir fluid level between calipers and top as needed.

Final checks

  • When all calipers are bled, fill the reservoir to the proper level, reinstall diaphragm and cap, and tighten securely.
  • Operate brake lever and pedal repeatedly to confirm firm feel and proper travel. If soft or spongy, repeat bleeding until solid.
  • Inspect around banjo fittings, bleed nipples and hose connections for leaks while static and during a short test ride.
  • Torque any removed fasteners (caliper mounting bolts, banjo bolts) to Polaris service manual specs. Replace crush washers if disturbed.
  • Properly dispose of old brake fluid per local regulations.

Troubleshooting

  • Persistent spongy lever after thorough bleed: check for leaks, collapsed hoses, or a faulty master cylinder.
  • Brake drag after bleeding: check caliper pistons for proper retraction and pad clearance; ensure caliper slides are free and lubricated where applicable.
  • If air continues to enter the system, inspect reservoir cap vent and hose routing for kinks or loose fittings.

Post-service ride and maintenance tips

  • Test brakes at low speed in a safe area before resuming normal operation.
  • Brake fluid is hygroscopic – absorbent of moisture. Replace every 1-2 years or sooner if the machine is used in wet/muddy conditions.
  • Keep a spare bottle of DOT 4 and a small bleed kit in your toolbox for future maintenance.

Following this MotoSport proprietary procedure will help ensure your 2019 Polaris Sportsman 570 EPS has a safe, responsive brake system. When in doubt, consult the factory service manual or a qualified technician.

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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.