How to bleed and replace brake fluid on a 2013 Polaris Sportsman 500 H.O. 4X4
Shop parts for a 2013 Polaris Sportsman 500 H.O. 4X4 ATV.
Overview
This guide from MotoSport walks you step-by-step through flushing and bleeding the brake system on a 2013 Polaris Sportsman 500 H.O. 4X4. Procedures emphasize safety, contamination avoidance, and correct bleeding order so you restore firm, consistent braking. Use DOT 4 brake fluid only and treat used fluid as hazardous waste.
What you’ll need
- DOT 4 brake fluid (new, unopened bottle)
- Clear plastic tubing sized to the bleeder nipple
- Brake bleeder wrench or suitable open-end wrench
- Small catch bottle or jar (marked for old brake fluid)
- Brake cleaner and rags
- Shop towels and gloves
- Torque wrench (for reassembly to spec)
- Zip-tie or helper for lever/pedal actuation
- Service manual/spec sheet for torque values and bleed order (keep on-hand)
Model-specific notes for the 2013 Sportsman 500 H.O. 4X4
- The brake master cylinder reservoir is mounted under the front cargo rack area (remove rack or access panel as needed). Keep the reservoir cap and diaphragm clean to avoid contamination.
- This model typically uses a simple hydraulic system with no ABS components; bleed nipples are on each caliper. Confirm caliper locations before starting.
- Calipers can be oriented vertically on some trims; gravity can help remove air when you follow the farthest-to-closest bleed order.
- If you run aftermarket racks or guards, ensure they do not block access to the reservoir or bleeder screws.
- Polaris brake line fittings use banjo bolts at calipers with crush washers — replace crush washers if they show deformation or leakage.
Preparation
- Park on level ground, set the parking brake, and disconnect battery negative if you will be removing electrical components near the master cylinder to prevent accidental pumps.
- Clean around the reservoir cap and bleed nipples with brake cleaner to prevent dirt entry.
- Loosen wheel lug nuts if you will remove wheels to access calipers. Lift and support the ATV safely on jack stands if required.
- Open the reservoir cap and remove the diaphragm & cap; place a clean cloth over the opening to minimize contamination. Keep the reservoir topped up during the entire procedure to avoid drawing air into the master cylinder.
General bleeding strategy
Bleed the system from the wheel farthest from the master cylinder to the closest. On most Sportsman layouts that means: far rear wheel (if separate rear caliper) or passenger-side front caliper — confirm which is farthest on your machine and follow that order. Always keep the reservoir level between MIN and MAX; never let it run dry.
Step-by-step bleeding and fluid replacement
- Prepare the catch bottle with clear tubing; push tubing onto the bleeder nipple and submerge the other end in a small amount of clean brake fluid in the catch bottle to prevent air re-entry.
- Top the reservoir with fresh DOT 4 fluid. Do not reuse fluid from the catch bottle.
- Have a helper or a mechanical lever setup: for front brakes use the lever; for rear brakes use the foot pedal. If working alone, use a one-way vacuum bleeder kit rated for brake fluid.
- Crack the bleeder nipple about 1/4 turn. With the helper holding steady pressure on the lever/pedal, open the nipple briefly to allow fluid and air to flow into the tubing, then close the nipple before the helper releases pressure. Repeat until clear, bubble-free fluid appears. Top the reservoir as needed.
- Work through each caliper in the chosen order, finishing with the caliper closest to the master cylinder. For single rear caliper systems do rear first, then both front calipers, farthest to nearest.
- After each caliper, tighten the bleeder screw to the specified torque or snugly by hand then a quarter-turn with the wrench — avoid rounding the nipple. Wipe off any spilled fluid immediately; DOT 4 damages paint and plastics.
- If you removed or loosened banjo bolts, replace crush washers and torque to service manual specification. Ensure no leaks at fittings.
- When bleeding is complete, top the reservoir to MAX, reinstall diaphragm & cap, and clean the area thoroughly.
Master cylinder flush (full fluid replacement)
- Follow the same bleed procedure, but run fresh fluid through until the fluid exiting the calipers is new and clear. Keep topping the reservoir; do not invert or overfill it.
- If the master cylinder contains stubborn contamination, consider removing the master to inspect and replace seals or the reservoir diaphragm per Polaris service guidance.
Final checks & safety
- With the ATV on stands and wheels reinstalled (if removed), apply the brake lever/pedal firmly several times to confirm a solid, non-spongy feel. If you feel sponginess, repeat bleeding.
- Check all fittings for leaks after a short test ride at low speed. Re-torque any hardware to service manual specs if leakage appears.
- Dispose of used brake fluid according to local hazardous-waste regulations. Do not pour it on the ground or into drains.
- Record the service date and mileage for maintenance history.
Troubleshooting
- Persistent spongy lever or pedal: likely air remains in the system or master cylinder seals are failing. Repeat bleeding and inspect master cylinder for internal leaks.
- Brake drag after bleeding: ensure calipers were retracted fully and that you did not overfill the reservoir; check for warped rotors or sticking caliper pistons.
- Leaking bleeder or banjo fittings: replace damaged bleeder nipples and crush washers; tighten to spec.
Maintenance interval recommendation
For reliable braking performance, replace brake fluid every 1-2 years depending on use and exposure to water/dust. Heavy trail use or water crossings justify annual changes.
Final note
Working on brakes directly affects safety. If you are uncertain about any step, or if the master cylinder or calipers appear damaged or corroded, contact a qualified technician. Keep a copy of your service actions in the vehicle’s maintenance log for future reference.
Related Shopping Categories
Shop Brake Fluid for a 2013 Polaris Sportsman 500 H.O. 4X4 ATV.
Shop Brake Bleeders for a 2013 Polaris Sportsman 500 H.O. 4X4 ATV.
Shop Brake Pads for a 2013 Polaris Sportsman 500 H.O. 4X4 ATV.
Shop Brake Lines for a 2013 Polaris Sportsman 500 H.O. 4X4 ATV.
Shop Brake Tools for a 2013 Polaris Sportsman 500 H.O. 4X4 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.