How to Bleed & Replace Brake Fluid on a 2016 Polaris Sportsman X2 570 EPS

Shop parts for a 2016 Polaris Sportsman X2 570 EPS ATV.

This MotoSport guide walks you through a safe, complete brake fluid drain, flush, and bleed routine tailored to the 2016 Polaris Sportsman X2 570 EPS (single-cylinder, hydraulic front/rear brakes with ABS not present on the base unit). Follow safe-lift and PPE practices — read each step fully before you start.

Tools & Supplies

  • DOT 4 brake fluid (Polaris recommends DOT 4; check owner's manual)
  • Clear plastic tubing to fit bleed nipples
  • Brake bleeder bottle or syringe and catch container
  • 10 mm wrench for bleed screws (verify size visually)
  • 7 mm, 10 mm sockets and ratchet for caliper and master cylinder fasteners
  • Clean rags, shop towels, rubber gloves, eye protection
  • Brake cleaner, torque wrench (for caliper bolts if removed)
  • Hydraulic line caps or plugs to limit contamination

Model Notes & Precautions for the Sportsman X2 570 EPS

  • Master cylinder reservoirs: front and rear share a tandem master cylinder assembly on many X2 570 EPS models. Confirm whether your unit has a single tandem reservoir or separate reservoirs before starting.
  • EPS wiring is near the handlebar area; avoid fluid contact with electrical connectors — brake fluid is corrosive to paint and plastic.
  • Front calipers are accessible by removing the front rack and/or wheel for better access; rear caliper access may require removing cargo rack panels on some trims.
  • If your ATV has electronic brake sensors, be cautious when cycling the system; do not force ABS components if present. If unsure, consult a dealer for ABS-specific procedures.
  • Brake fluid is hygroscopic; replace fluid every 2 years or sooner depending on use — off-road/moist conditions accelerate contamination.

Preparation

  1. Park on level ground, engage park brake, disconnect battery negative terminal to prevent unexpected electrical issues.
  2. Raise front and/or rear with appropriate stands so wheels can rotate freely. Block wheels for safety.
  3. Clean around master cylinder reservoir caps and caliper bleed screws to prevent contamination getting into system.
  4. Remove reservoir cap(s) and diaphragm. Siphon or sponge out as much old fluid from reservoirs as possible to minimize contamination during fresh-fill.

Complete Fluid Replacement & Bleed – Recommended Sequence

This sequence replaces fluid from the calipers back to the master cylinder to ensure fresh fluid reaches the entire circuit.

  1. Top up reservoir with fresh DOT 4 fluid to the MAX line. Do not overfill.
  2. Start with the caliper farthest from the master cylinder. On Sportsman X2 layouts that is typically: rear caliper (if rear master feed), then right front, then left front. Confirm routing visually.
  3. Place a catch bottle below the bleed nipple. Attach clear tubing to the nipple and submerge the other end in fluid in the catch bottle to avoid drawing air back in.
  4. Loosen the bleed nipple about 1/4 to 1/2 turn. Have a helper slowly depress the brake pedal lever (or lever) several times and hold it down while you open the bleed nipple briefly to let fluid and air escape, then close the nipple before they release the pedal. Repeat until fluid runs clear and bubble-free. If solo, use a syringe or vacuum bleeder at the nipple.
  5. Keep the master reservoir level between MIN and MAX the entire time. Never let it drop low enough to draw air into the system.
  6. When bleed step yields clear fluid with no air, tighten the bleed nipple to factory snug (do not exceed recommended torque for nipple if specified). Wipe area clean.
  7. Move to the next caliper following the same procedure. Replenish reservoir as needed.
  8. Once all calipers are bled, cycle the lever/pedal several times to check for firmness. If sponginess remains, repeat bleeding sequence.

Master Cylinder Bench Bleed (Recommended if master had significant contamination)

  1. If you removed the master for cleaning, bench-bleed it before reinstalling: mount in a vise, fill to MAX, attach short return lines from outlet ports back into reservoir, and slowly actuate the lever until fluid runs clear without bubbles.
  2. Reinstall master cylinder, torque mounting bolts to Polaris spec (consult service manual for exact values), reconnect brake lines, and perform system bleeding again to purge any trapped air.

Post-Bleed Checks

  • Confirm reservoir level at MAX after final bleeding and secure cap with clean diaphragm.
  • Operate the brake lever/pedal multiple times at rest to verify firm, non-spongy feel. Take a low-speed test ride in a safe area to confirm braking performance.
  • Inspect for leaks at bleed nipples, caliper banjo fittings, and master cylinder. Re-torque fittings if necessary to spec.
  • Properly dispose of used brake fluid — it is toxic and must not be poured down drains.

Troubleshooting & Tips

  • Persistent sponginess after repeated bleeding indicates trapped air or an internal master cylinder issue — consider master cylinder rebuild or replacement.
  • If one circuit continues to introduce air, inspect the brake line fittings and banjo washers for proper sealing and tightness.
  • Use fresh sealed DOT 4 fluid only — mixing with DOT 3 is permitted but will lower boiling performance; never use DOT 5 (silicone) in systems designed for glycol-based fluids.
  • Keep brake fluid off painted surfaces. Immediately wash any spills with water and brake cleaner if safe for the surface.

MotoSport Maintenance Reminders for the Sportsman X2 570 EPS Owner

  • Brake fluid replacement interval: every 2 years under normal use; sooner under heavy/off-road/moist conditions.
  • Regularly inspect brake lines and hoses for cracking from flex with steering & suspension movement, especially around the front axle and handlebar areas.
  • EPS-equipped bikes benefit from careful routing of electrical connectors away from fluid during work — resecure connectors after maintenance.
  • If you're unsure about ABS or electrical components on your specific MMY package, contact a MotoSport technician or authorized Polaris dealer for model-specific diagnostics.

Perform the job methodically, keep contaminants out of the system, and test brakes in a controlled environment before normal use. For genuine or high-quality replacement parts and consumables for your 2016 Polaris Sportsman X2 570 EPS, visit the MotoSport parts page linked above.

Related Shopping Categories

Shop Brake Fluid for a 2016 Polaris Sportsman X2 570 EPS ATV.

Shop Brake Bleeders for a 2016 Polaris Sportsman X2 570 EPS ATV.

Shop Brake Pads for a 2016 Polaris Sportsman X2 570 EPS ATV.

Shop Brake Lines for a 2016 Polaris Sportsman X2 570 EPS ATV.

Shop Brake Tools for a 2016 Polaris Sportsman X2 570 EPS 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.