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

Shop parts for a 2019 Polaris Sportsman 570 SP ATV.

This MotoSport proprietary guide walks you through a complete, safe brake fluid replacement and bleed for the 2019 Polaris Sportsman 570 SP. Follow these steps carefully. If your machine has factory ABS or aftermarket electronic systems, stop and consult a dealer or the owner's manual before proceeding.

What you need

  • DOT 4 brake fluid (Polaris recommends DOT 4; do not mix with DOT 5 silicone)
  • Clear plastic tubing that fits bleed nipples
  • Catch bottle for old fluid
  • Wrenches for bleed nipples (typically 8 mm or 10 mm)
  • Phillips or flat screwdriver for reservoir cap, shop rags, gloves and safety glasses
  • Brake cleaner and a torque wrench (for caliper/re-assembly checks)
  • Assistant to operate the brake lever (recommended)

Pre-checks specific to the 2019 Sportsman 570 SP

  • Park on level ground with engine off, key removed and parking brake engaged.
  • Locate the master cylinder reservoir on the handlebar for front brakes and the rear master cylinder near the rear brake pedal for rear brakes. The Sportsman 570 SP has hydraulic front and rear disc brakes; check both systems separately.
  • Inspect hoses, calipers and brake lines for leaks, cracks or damage. Replace damaged components before bleeding.
  • If your model is equipped with antilock or electronic braking options, refer to factory service guidance. This guide covers conventional hydraulic bleeding only.

Step-by-step: Replace brake fluid and bleed brakes

1. Prepare the reservoir

  • Clean around the reservoir caps to prevent contamination.
  • Remove the cap slowly and wipe any accumulated residue. Do not let dirt fall in.
  • Use a turkey-baster or syringe to remove most old fluid from the reservoir for disposal; leave some to prevent introducing air into the master cylinder.

2. Top up with fresh DOT 4 fluid

  • Fill the reservoir to the "MAX" line with new DOT 4 fluid. Keep the cap off but covered to minimize airborne contamination while you work.

3. Start bleeding the caliper (front first, then rear)

  • Mount the clear tubing on the bleed nipple and submerge the other end in a partially filled catch bottle.
  • Have an assistant slowly pull the brake lever or press the pedal and hold pressure.
  • Open the bleed nipple a 1/4 to 1/2 turn to let fluid and air escape into the tubing. Close the nipple before your assistant releases pressure to avoid sucking air back in.
  • Repeat: pump, hold, open, close until you see clear, bubble-free fluid at the tubing end and the lever/pedal feels firm.
  • Keep the reservoir topped up during the entire process to prevent air from entering the master cylinder.

4. Bleed both sides if applicable

  • If the Sportsman has dual front calipers, bleed the caliper farthest from the master cylinder first, then the nearer one.
  • Finish with the rear brake, following the same procedure and keeping the reservoir topped.

5. Final checks and cleanup

  • When bleeding is complete and lever/pedal feel solid, torque bleed nipples to factory spec if you removed them. Wipe up any spilled fluid immediately – brake fluid can damage painted surfaces and plastics.
  • Refill reservoir to MAX then reinstall and secure the cap. Dispose of old fluid responsibly; do not reuse.
  • Test ride cautiously at low speed to confirm braking performance. Re-check fluid level after the first short ride and inspect for leaks.

Torque, specs & maintenance notes

  • Use fresh DOT 4 only; do not mix with DOT 5. If you're unsure, replace all fluid in both circuits to ensure consistency.
  • Replace brake pads and inspect rotors if brake feel is still soft after a proper bleed.
  • Brake fluid should be changed every 1-2 years depending on use and exposure to moisture. For machines ridden in wet, muddy, or heavy-duty conditions, check and change annually.
  • Keep an eye on the reservoir sight level and color; dark fluid is a sign it needs replacing.

Model-specific reminders for the 2019 Sportsman 570 SP

  • The Sportsman 570 SP uses sealed hydraulic calipers; avoid disassembling calipers unless you have the correct seals and tools. Rebuild kits are available through MotoSport for worn components.
  • Store-bought aftermarket brake components must match OEM specifications; oversized rotors or incompatible pads can change hydraulic behavior and pedal feel.
  • If your Sportsman has factory sway or accessory racks installed, ensure they do not obstruct access to the rear master cylinder during maintenance.
  • Electronic accessories should be disconnected when working near the battery or wiring harness to avoid shorts when fluid spills.

Following this guide will restore proper brake performance on your 2019 Polaris Sportsman 570 SP. If you encounter persistent sponginess after a careful bleed, consult a qualified technician; internal master cylinder sealing or ABS module issues may require professional service.

Related Shopping Categories

Shop Brake Fluid for a 2019 Polaris Sportsman 570 SP ATV.

Shop Brake Bleeders for a 2019 Polaris Sportsman 570 SP ATV.

Shop Brake Pads for a 2019 Polaris Sportsman 570 SP ATV.

Shop Brake Lines for a 2019 Polaris Sportsman 570 SP ATV.

Shop Brake Tools for a 2019 Polaris Sportsman 570 SP 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.