How to Bleed & Replace Brake Fluid on a 2019 Polaris Sportsman 570
Shop parts for a 2019 Polaris Sportsman 570 ATV.
This proprietary MotoSport guide walks you through safely flushing and replacing the brake fluid on a 2019 Polaris Sportsman 570, plus model-specific notes every owner should know. Follow each step carefully, use proper PPE, and work on a clean, stable surface.
What you need
- DOT 4 brake fluid (Polaris specifies DOT 4)
- Turkey baster or fluid syringe
- Clear tubing that fits bleeder nipples
- Catch container for old fluid
- Box-end wrench set (bleeder nut size typically 8mm or 10mm verify on your machine)
- Hex or Torx drivers for caliper/master cylinder access
- Clean rags, rubber gloves, safety glasses
- Jack and secure stands or ramps to access wheels
- Assistant for manual pedal/lever bleeding (or a vacuum/pressure bleeder)
Model-specific notes for the 2019 Polaris Sportsman 570
- The 2019 Sportsman 570 uses hydraulic disc brakes front and rear; bleeding procedure applies to both front calipers and the rear caliper.
- The brake master cylinder reservoir is mounted on the handlebar area for the front/rear combination system; fluid level monitoring is easy but be careful with the thin plastic reservoir lid.
- Polaris recommends DOT 4 fluid; do not mix DOT 3 and DOT 5.1 unless you confirm compatibility. Do not use silicone DOT 5.
- ABS is not present on base 570 models; if your unit has optional systems, follow Polaris-specific service manual precautions.
- Brake line routing is exposed to trail debris. Inspect lines and fittings for chafe, cracking, or rust before bleeding; address any damage before refilling system.
Safety first
- Wear eye protection & gloves. Brake fluid damages paint and skin.
- Work on a level surface with wheels chocked. Secure the ATV on stands when removing wheels.
- Keep the master cylinder reservoir cap closed as much as possible to minimize contamination.
Preparation
- Park ATV, kill engine, remove key. Place on level surface; chock wheels.
- Clean around the master cylinder reservoir cap to avoid contamination. Remove cap and diaphragm, but leave loosely seated to vent; do not let dirt fall in.
- If fluid is dark or contaminated, suction out old fluid from the reservoir with a turkey baster or syringe until mostly empty.
- Top up reservoir with fresh DOT 4 to a safe working level but not overfull you will be cycling fluid during bleeding.
- Identify bleed nipples on each caliper. Put clear tubing on nipple and route to catch container; submerge tubing end in a little fresh fluid in the catch jar to avoid air re-entry.
Bleeding order
Always bleed from the caliper farthest from the master cylinder, progressing to the nearest. For the Sportsman 570 this normally means:
- Right front (far right) caliper first
- Left front (far left) caliper next
- Rear caliper last
If you are uncertain about distance on your machine, follow the same rule — farthest to nearest relative to the master cylinder.
Bleeding procedure (manual method)
- Have an assistant slowly squeeze and hold the brake lever (or pedal for rear) while you open the bleed nipple a 1/4 turn with the correct wrench. Fluid & air will flow into the tubing. Close the nipple before assistant releases the lever. Repeat until you see clear fluid with no bubbles. Keep reservoir topped between cycles to prevent drawing air in.
- Perform this process for the right front, then left front, then rear. Each caliper may require several cycles.
- When each caliper is clear of bubbles, tighten the bleed nipple to the specified snugness (do not over-torque; snug plus small fraction is typical). Wipe any spilled fluid immediately.
- After bleeding all calipers, pump the brake lever gently to build lever/pedal firmness. Check reservoir fluid level and top to the appropriate mark, then reinstall diaphragm & cap securely.
- Torque any removed caliper or wheel fasteners to factory specs. Remove jack/stands, lower machine, and perform a controlled slow test ride in a safe area to confirm brake performance.
Using a vacuum or pressure bleeder
- Vacuum: Attach vacuum pump to the bleed nipple tubing, open nipple & draw until clear fluid appears; close nipple before removing vacuum. Repeat per caliper in specified order.
- Pressure bleeder: Follow tool instructions. Pressurize reservoir, open each bleed nipple in order until clear fluid flows, then close.
Final checks
- Ensure lever/pedal feel is firm and consistent with no sponginess.
- Inspect all fittings for leaks after the test ride.
- Properly dispose of old brake fluid per local regulations.
- Record date and mileage for maintenance history; brake fluid typically recommended to be replaced every 12-24 months depending on use & contamination risk.
Troubleshooting
- If lever or pedal remains soft after bleeding, recheck for air entry points, cracked lines, or a leaking master cylinder. Replace or repair as needed.
- If you see persistent foaming or rapid discoloration, the system may be contaminated flush again and inspect rubber components for degradation.
Following this MotoSport proprietary guide will keep your 2019 Polaris Sportsman 570 stopping reliably. If you encounter complications beyond routine bleeding & fluid replacement, consult a certified Polaris technician or MotoSport parts specialists for replacement components.
Related Shopping Categories
Shop Brake Fluid for a 2019 Polaris Sportsman 570 ATV.
Shop Brake Bleeders for a 2019 Polaris Sportsman 570 ATV.
Shop Brake Pads for a 2019 Polaris Sportsman 570 ATV.
Shop Brake Lines for a 2019 Polaris Sportsman 570 ATV.
Shop Brake Tools for a 2019 Polaris Sportsman 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.