How to Bleed & Replace Brake Fluid on a 2015 Polaris Sportsman Touring 570

Shop parts for a 2015 Polaris Sportsman Touring 570 ATV.

This proprietary MotoSport guide walks you through safely flushing and bleeding the brake system on a 2015 Polaris Sportsman Touring 570. Follow these steps carefully – clean work, correct fluid, and correct sequence are essential for safe braking performance.

What you’ll need

  • DOT 4 brake fluid (Polaris recommends DOT 4; always confirm with your manual)
  • Clear hose that fits bleed nipples
  • Small catch bottle or vacuum bleeder
  • Wrenches to fit bleed nipples (open-end or flare)
  • Clean funnel or syringe for reservoir
  • Shop rags, safety glasses, nitrile gloves
  • Replacement crush washers for banjo bolts (recommended)
  • Torque wrench (for caliper/banjo bolt reassembly)

Safety & model-specific notes

  • 2015 Sportsman Touring 570 typically uses DOT 4 brake fluid. Avoid mixing with DOT 5 (silicone).
  • The vehicle uses separate front and rear hydraulic circuits – front lever operates front, foot pedal operates rear. Bleed each circuit separately.
  • Keep brake fluid off painted plastics & bodywork – it will damage finish. Wipe spills immediately.
  • Inspect flexible hoses for swelling, cracks, or leaks; replace if any deterioration is present. Old rubber hoses are a common cause of soft pedal issues.
  • If the master cylinder reservoir is low due to worn pads, replace or service pads before bleeding to avoid overfilling the calipers.

Preparation

  1. Park on a level surface, engage parking brake, and chock wheels.
  2. Clean the reservoir cap area to prevent contamination. Remove cap and diaphragm carefully and set aside on a clean rag.
  3. Top reservoir with DOT 4 fluid to the proper level but do not overfill; maintain visible fluid during bleeding.
  4. Identify bleed nipples on calipers. For front, bleed the caliper farthest from the master cylinder first; for rear, bleed the rear caliper last.

Bleeding sequence & method (recommended method — vacuum or pressure is easiest)

Method A — Vacuum bleeder (recommended for clean, fast bleeding):

  1. Attach clear hose to bleed nipple and place the other end into a jar partially filled with clean fluid.
  2. Attach vacuum pump to the jar or bleed nipple per tool instructions and apply light vacuum.
  3. Open bleed nipple about 1/4 turn. Operate the front lever (or pedal for rear) slowly until clear fluid with no air bubbles flows. Keep reservoir topped while bleeding.
  4. Close nipple while vacuum is held, then release vacuum. Repeat until bubbles stop.
  5. Start with the caliper farthest from the master cylinder and work to the nearest. For the Sportsman Touring 570: typically passenger/front-right first, then driver/front-left, then rear caliper last (confirm which caliper is farthest on your machine).
  6. After each caliper, tighten the bleed nipple to spec snugness; wipe clean and re-torque banjo bolts with new crush washers if removed.

Method B — Pressure or manual two-person bleed:

  1. One person holds steady pedal/lever application while the other opens and closes the bleed nipple. Keep reservoir full at all times.
  2. Pump slowly to avoid aeration and maintain steady strokes. Close nipple before releasing pedal/lever to prevent air re-entry.

Reservoir flush & complete fluid replacement

  1. To fully replace old fluid, remove as much old fluid from the reservoir as possible with a syringe or turkey baster, then refill with fresh DOT 4.
  2. Perform bleeding sequence until clear fresh fluid flows from each caliper and no bubbles appear.
  3. Repeat reservoir purge & bleed until the fluid color remains clear and consistent.

Reassembly & checks

  1. Top reservoir to the proper mark, reinstall diaphragm and cap securely.
  2. Clean any spilled fluid immediately. Inspect lines, fittings, and calipers for leaks while pressurizing the system by gently applying lever/pedal.
  3. Confirm pedal/lever firmness — it should be firm and not spongy. If spongy, re-bleed until firm.
  4. Torque any removed bolts to Polaris specifications; replace crush washers on banjo bolts whenever you open those connections.
  5. Test ride at low speed in a safe area to confirm braking function before normal use.

Troubleshooting

  • Persistent spongy pedal: likely remaining air or soft/expanded hoses. Re-bleed and inspect hoses; replace if necessary.
  • Brake drag after bleeding: check caliper pistons for sticking, ensure caliper slide bolts move freely, and that pads retract properly.
  • Rapid fluid level drop in reservoir: indicates leak in system — locate and repair before riding.

Maintenance tips

  • Replace brake fluid every 2 years or sooner if contaminated. Moisture absorption reduces boiling point and braking effectiveness.
  • Keep a sealed container of DOT 4 on hand for top-ups; once opened, brake fluid can absorb moisture so store tightly sealed and use within a reasonable timeframe.
  • Record bleeding and fluid change dates in your maintenance log. Proper records help with resale value and service intervals.

Following this MotoSport procedure will restore reliable brake performance on your 2015 Polaris Sportsman Touring 570. If you encounter persistent issues after a thorough bleed, consult a qualified technician for master cylinder or caliper overhaul.

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Shop Brake Tools for a 2015 Polaris Sportsman Touring 570 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.