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

Shop parts for a 2015 Polaris SPORTST570SP ATV.

This MotoSport-exclusive service guide walks you step-by-step through flushing and bleeding the brake fluid on a 2015 Polaris Sportsman Touring 570 SP. It covers safety, tools, step sequences, tips specific to this MMY ATV, and maintenance intervals. Follow these procedures carefully & use the correct parts and fluid specified for your machine.

Safety & Preparation

  • Work on a flat, stable surface with the engine off and key removed.
  • Wear safety glasses & nitrile gloves. Brake fluid is corrosive to paint and skin.
  • Keep rags and a catch container ready. Dispose of old brake fluid per local regulations.
  • Park the ATV on the center stand or secure it so wheels can turn freely while bleeding.
  • Identify the brake systems on your Sportsman: front brake lever and rear brake (foot lever/parking linkage). This model has separate hydraulic circuits; bleed each master cylinder separately.

Tools & Supplies

  • DOT 4 brake fluid (or the specification listed in your owner’s manual)
  • Clear plastic tubing and a catch bottle
  • Brake bleeder wrench or appropriately sized box wrench
  • Syringe or turkey baster for removing fluid from reservoirs
  • Torque wrench for reassembly where required
  • Clean lint-free rags, gloves, safety glasses
  • Optional: vacuum bleeder or hand pump bleeder for faster, cleaner jobs

Model Notes & What Owners Should Know

  • The 2015 Sportsman Touring 570 SP uses sealed hydraulic fittings with copper crush washers on banjo fittings at the calipers. Replace crush washers whenever you open a banjo bolt to ensure a leak-free seal.
  • There are separate master cylinders for front and rear systems. Treat them individually to avoid mixing circuits.
  • Polaris recommends specific fluid performance levels; if the manual calls for DOT 4, do not substitute DOT 5 silicone fluid. If in doubt use DOT 4.
  • Inspect hoses for cracking, swelling or leaks while you’re servicing the brakes. Replace any rubber lines that show age-related degradation.
  • Replace the brake master cylinder reservoir cap gasket if brittle or damaged to prevent contamination.
  • If you have aftermarket accessories that tie into the brake system (trailers, auxiliary brakes), verify those fittings before beginning; they can change bleed order.

Step-by-Step: Flush & Bleed Brake Fluid

Bleeding is easiest with a partner, but a vacuum bleeder or one-way bleeder kit lets you work solo.

1. Identify Reservoirs & Bleed Nipples

Locate the front brake master cylinder on the handlebar and the rear brake master cylinder near the foot controls. Locate each caliper’s bleed nipple and note the farthest wheel from its master cylinder – you will start there for each circuit.

2. Remove Old Fluid from Reservoir

Open the reservoir cap(s) and use a syringe or turkey baster to remove as much old fluid as possible. Wipe the reservoir & cap with clean lint-free rags. Top with a small amount of fresh fluid so air is not drawn into the master cylinder while you work.

3. Set Bleed Sequence

For each master cylinder circuit, start bleeding at the caliper farthest from that master cylinder, then move to the next farthest, finishing at the closest caliper. Typical sequence for a single-circuit front system: right front then left front (or the opposite depending on master cylinder location). For the rear circuit, follow the same farthest-to-nearest rule. If you have any doubt, follow the distance rule rather than wheel position.

4. Attach Tubing & Prepare Catch Bottle

Slip clear tubing over the bleed nipple and route into a catch bottle partially filled with used fluid to minimize air re-entry. Crack the bleed nipple one or two turns, not fully.

5. Bleeding with a Partner (Squeeze/Release Method)

  • Partner slowly squeezes the brake lever or presses the foot pedal until a firm pressure is felt, then holds.
  • Open the bleed nipple to let fluid and air escape into the tubing. Close the nipple before the lever/pedal is released.
  • Repeat until clear, bubble-free fluid flows and the lever/pedal feel returns to firm.
  • Top up the reservoir frequently to prevent drawing air into the master cylinder.

6. Bleeding Solo (Vacuum or Pump Bleeder)

  • Attach vacuum bleeder to the bleed nipple and apply vacuum while you open the nipple. Watch for clear fluid, then close nipple and release vacuum.
  • With a one-way bench or hand pump bleeder, follow the tool manufacturer’s directions – always keep the reservoir topped up.

7. Work Each Caliper in Sequence

Repeat the bleed process for each caliper in the sequence until you have clear fluid with no air bubbles and a firm lever/pedal feel. Always keep the reservoir topped up between cycles.

8. Close Bleed Nipples & Reinstall Crush Washers

When finished, torque bleed nipples or banjo bolts to the vehicle manufacturer’s recommended value if available. Replace crush washers on banjo bolts when reassembled. Clean any spilled fluid immediately.

9. Final Checks

  • Confirm proper lever/pedal firmness with engine off, then with engine running if applicable.
  • Check for leaks at calipers, lines, banjo bolts and master cylinder.
  • Wipe all brake fluid from painted surfaces. Allow fluid to cure per product instructions before riding if recommended by the fluid manufacturer.

Common Troubleshooting

  • Spongy lever after bleeding – repeat bleeding sequence, ensuring reservoir never runs low during the process and bleeder nipples are fully closed between strokes.
  • Persistent air – check for loose fittings, cracked hoses or leaking master cylinder seals; replace faulty components.
  • Brake fade or low pedal – if caused by contaminated fluid, perform a complete flush and replace with fresh DOT 4 fluid. If problem persists, inspect calipers and master cylinders for internal damage.

Maintenance Interval & Best Practices

  • Replace brake fluid every 1-2 years depending on use, storage conditions, and water contamination. Heavy wet usage demands more frequent service.
  • Always use fresh fluid from a sealed container. Dispose of opened fluid responsibly – brake fluid absorbs moisture over time.
  • Keep replacement crush washers, cleaner rags, and spare master cylinder reservoir gaskets in your toolbox for routine service.

Final Notes Specific to the 2015 Polaris Sportsman Touring 570 SP

  • This model’s plumbing and master cylinder placement can make access slightly tight in the front; remove small panels if needed for better access but keep fasteners organized for reassembly.
  • The Touring package includes accessory mounts and racks that can obscure access to rear components — remove or shift cargo racks when necessary to avoid contaminating painted surfaces.
  • Because this is a touring-class machine, owners often run heavier loads — inspect mounting hardware on the brake calipers and lines for corrosion or looseness during each service interval.

Following these MotoSport procedures will restore proper hydraulic performance and extend the life of your Sportsman’s braking system. If you encounter internal master cylinder failure, collapsed hoses, or persistent leaks, replace the faulty component rather than relying on repeated bleeding.

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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.