How to Bleed and Replace Brake Fluid on a 2018 Polaris Sportsman X2 570 EPS
Shop parts for a 2018 Polaris SPORTS570X2EPS ATV.
This proprietary MotoSport guide walks you through safely flushing the brake system on a 2018 Polaris Sportsman X2 570 EPS, replacing contaminated or aged fluid, and restoring firm, reliable braking. Follow every step carefully and use appropriate safety gear. If you’re not comfortable performing brake service, have a qualified technician complete the work.
What you need
- DOT4 brake fluid (use fresh, unopened bottle — verify type in your owner’s manual)
- Clear vinyl tubing to fit bleeder nipples
- Catch bottle for old fluid
- Brake bleeder hand pump or vacuum/pressure bleeder (recommended) or a helper for manual bleeding
- Socket set, box wrenches (bleeder nipple size typically 8 mm – inspect nipples), pliers
- Clean rags, safety glasses, nitrile gloves
- Torque wrench (for caliper fasteners if removed)
- Jack and stands or ramp to safely lift the machine
Model notes — 2018 Polaris Sportsman X2 570 EPS
- The Sportsman X2 570 EPS uses hydraulic disc brakes front and rear. The brake reservoir(s) are located under the seat/near handlebar area depending on model year trim – confirm reservoir position before starting.
- Electronic Power Steering (EPS) on this model does not share fluid with the brake system, but EPS systems can be sensitive to electrical connectors — avoid getting fluid on wiring or connectors.
- Parking/park brake mechanisms on the X2 use mechanical linkages on some trims; make sure parking brake is released and not engaged while bleeding rear circuits.
- Brake line fittings and caliper bleeder nipples are susceptible to rounding if over-tightened. Use correct wrench size and firm, steady force.
- Keep brake fluid off painted & rubber surfaces — it will damage finish and seals. Clean spills immediately with water and a rag.
Preparation
- Park machine on a level surface, turn engine off, remove key, and ensure parking brake is disengaged (unless instructed otherwise for certain bleed sequences).
- Raise the ATV safely on stands so wheels hang free. Chock and secure the machine to prevent movement.
- Locate the brake fluid reservoir(s) and clean the cap area before opening to prevent contamination.
- Remove the reservoir cap and diaphragm carefully. Keep the reservoir topped with new fluid during the process to prevent air entry.
Basic bleed method (recommended order: far wheel to near wheel)
On an ATV with two rear brakes (if applicable) and two front brakes, start with the wheel farthest from the master cylinder and work toward the master cylinder. For many Polaris layouts this means: Rear (far side) → Rear (near side) → Front (far) → Front (near). Confirm actual master cylinder location on your machine before starting.
- Attach clear tubing over the bleeder nipple at the chosen wheel and place the other end into a catch bottle partially filled with some fresh fluid to prevent air from being drawn back in.
- Have an assistant slowly press the brake pedal several times and hold it depressed. With the pedal held, open the bleeder nipple a 1/4 turn to allow fluid and air to escape. Close the nipple before the assistant releases the pedal. Repeat until clear fluid with no bubbles flows. If using a vacuum or pressure bleeder, follow the tool manufacturer’s procedure while keeping the reservoir topped.
- Top up the reservoir frequently during the process. Never allow the reservoir to run dry or air will be introduced into the system.
- Repeat the procedure for each wheel in the recommended order until all lines are clear of air and the pedal feels firm and consistent.
- After final wheel bleed, have an assistant apply steady pedal pressure while you tighten the bleeder nipple to the specified snugness (do not over-torque). If you removed calipers, torque caliper bolts to Polaris spec.
- Confirm reservoir fluid level is between MIN and MAX marks; install diaphragm and cap securely.
Complete fluid flush (replace all old fluid)
- Perform the basic bleed on every wheel until fluid exiting each bleeder is the new fluid color and free of contaminants. This ensures system-wide fluid replacement.
- If the master cylinder or ABS/modulator (if equipped) requires special bleed patterns, follow Polaris service specifications. When in doubt, cycle until fluid clears at every bleeder.
Bleeding with a one-man vacuum or pressure bleeder
- Attach the tool to the reservoir or bleeder nipple as per the tool instructions. Use fresh DOT4 fluid into the reservoir and run the tool until air-free fluid exits each bleeder, maintaining reservoir level.
- These tools reduce the risk of introducing air and are faster for a complete flush.
Post-bleed checks
- Check pedal firmness at ignition off and with engine running (EPS engaged) — pedal should be firm and consistent.
- Inspect all bleeder nipples, hose connections, and reservoir for leaks.
- Lower the machine, test brakes at low speed in a safe area to verify performance before returning to regular use.
- Dispose of used brake fluid properly at a local hazardous waste facility.
Torque & service interval recommendations
- Do not overtighten bleeder nipples — snug plus a small fraction of a turn. If you remove calipers, tighten to Polaris torque specs shown in the factory manual.
- Brake fluid should be inspected yearly and replaced every 1–2 years or sooner if contaminated or if the vehicle is used in wet/muddy conditions frequently.
Common issues & troubleshooting
- Spongy pedal after bleeding: likely air remaining in system — re-bleed, ensuring reservoir never runs dry and follow far-to-near order.
- Persistent soft pedal only after engine runs: check vacuum assist systems or ABS modulator connections if the machine is equipped; consult dealer service if problem persists.
- Leaking bleeder nipple: replace nipple and re-bleed.
Following these steps will get your 2018 Polaris Sportsman X2 570 EPS’ brake system reliably serviced and back on the trail. When in doubt about model-specific procedures, refer to the factory service manual or contact a trusted Polaris dealer.
Related Shopping Categories
Shop Brake Fluid for a 2018 Polaris SPORTS570X2EPS ATV.
Shop Brake Bleeders for a 2018 Polaris SPORTS570X2EPS ATV.
Shop Brake Pads for a 2018 Polaris SPORTS570X2EPS ATV.
Shop Brake Lines for a 2018 Polaris SPORTS570X2EPS ATV.
Shop Brake Tools for a 2018 Polaris SPORTS570X2EPS 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.