How to Bleed & Replace Brake Fluid on a 2021 Can-Am Outlander 850 XT

Shop parts for a 2021 Can-Am Outlander 850 XT ATV.

This MotoSport-exclusive guide walks you through a professional, safe brake fluid change and bleed procedure specific to the 2021 Can-Am Outlander 850 XT. Follow these steps precisely to restore firm braking, avoid contamination, and protect your machine.

Safety & preparation

  • Work in a well-ventilated, level area. Wear gloves and eye protection. Brake fluid is corrosive to paint & plastics.
  • Use only manufacturer-recommended DOT4 brake fluid. Do not mix with other fluid types.
  • Gather tools: DOT4 brake fluid, clear bleed hose, catch bottle, box wrench set (bleeder wrench sizes commonly 8 mm), torque wrench, funnel or syringe for reservoir, clean rags, jack or ATV lift, and a vacuum or pressure bleeder if available.
  • Park the Outlander on a secure stand so wheels can turn freely if needed. Chock wheels if not lifted.

Model-specific notes for the 2021 Outlander 850 XT

  • The front master cylinder is on the right handlebar (front brake lever). The rear master cylinder is tied to the foot-operated brake system near the left rear area. Identify the two brake fluid reservoirs before starting.
  • The Outlander 850 XT uses hydraulic disc brakes on all wheels. Bleed each caliper at the bleed nipple on the caliper bodyprotect painted surfaces from spilled fluid.
  • If your machine has factory ABS/electronic braking components, reference your owner manual before depressurizing the system; this model typically uses conventional hydraulics but verify if optional electronics are present.
  • Replace copper crush washers on banjo bolts anytime you disconnect brake lines. Inspect lines for swelling, cracking, or leaks; replace if damaged.
  • Recommended service interval: replace brake fluid every 2 years or sooner if contaminated or moisture ingress is suspected.

Step-by-step bleed & fluid replacement (two-person method)

  1. Open the front and rear reservoirs. Clean the caps & surrounding area thoroughly to prevent contamination.
  2. Siphon or draw out old fluid from each reservoir with a syringe or turkey baster until most old fluid is removed, keeping reservoir bottoms clean but do not scrape seals.
  3. Top each reservoir with fresh DOT4 fluid. Keep caps loosely in place to limit contamination while allowing air escape.
  4. Start with the caliper furthest from the main front master cylinder and master line. For the Outlander 850 XT that sequence is generally: rear caliper first, then right front caliper, then left front caliper. (If you know your specific bike routing differently, follow the "furthest to nearest" rule relative to each master cylinder.)
  5. Attach a clear bleed hose to the caliper bleed nipple and route the other end into a catch bottle partially filled with fresh fluid to prevent air from being sucked back in.
  6. Have an assistant slowly depress the brake lever or pedal to the end of travel and hold it. Open the bleed nipple 1/4 turn to allow fluid & air to escape. Close the nipple BEFORE the assistant releases the lever/pedal. Repeat until clear, bubble-free fluid exits.
  7. Keep the corresponding reservoir topped during the process to prevent air ingestion into the system. Do not let the reservoir run dry.
  8. Work each caliper in sequence until new, clear fluid flows and no air bubbles appear. Finalize each bleed nipple tightness to proper snugdo not over-torque; snug plus quarter-turn is typical. Replace any crush washers if removed.
  9. After bleeding all circuits, top reservoirs to the correct level, reinstall caps, and clean any spilled fluid immediately.
  10. Pump the brakes with ignition on (if equipped) and confirm firm, consistent lever & pedal feel. With the machine safely on the ground, conduct a low-speed brake test in a safe area to confirm proper operation before returning to normal riding.

Using a vacuum or pressure bleeder (single-person)

  • Connect the vacuum bleeder to the caliper bleed nipple with the clear hose and operate per tool instructions while you slowly add fluid to the reservoir so it never runs dry. Follow the same sequence: furthest to nearest.
  • If using a pressure bleeder on the master reservoir, set pressure per tool instructions, open caliper nipples sequentially until fluid runs clear, then close before reducing pressure.

Common pitfalls & troubleshooting

  • Soft or spongy brake lever after bleeding: almost always indicates trapped air. Repeat bleeding sequence, ensuring reservoir never runs dry and nipple closures occur before releasing the lever/pedal.
  • Brake drag after bleeding: check caliper sliding pins for corrosion, re-install pads correctly, and ensure caliper pistons were not pushed out too far. Inspect line routing to ensure no kinks.
  • Persistent leaks: replace seals, hoses, or banjo bolts and crush washers. Do not ride with any fluid leaks.

Post-service care & disposal

  • Dispose of old brake fluid responsibly at an approved hazardous-waste collection point.
  • Inspect brake pad thickness and rotor condition while working. Replace worn pads or damaged rotors; replacing fluid when installing new pads is good practice.
  • Record the service date and fluid type in your maintenance log. Note that DOT4 absorbs moisture over time — retain the two-year replacement guideline.

Troubleshooting quick checklist

  • No firm pressure: repeat bleeding; check for leaks or collapsed brake hose.
  • Brake fade after heavy use: check fluid condition & boiling point; contaminated fluid lowers boiling point — flush immediately.
  • ABS warning or irregular behavior after bleeding: cycle power, consult dealer if fault persists; some systems require specific relearn or diagnostic reset.

Perform this service with care. If at any point you are not confident in the procedure or if the Outlander exhibits braking abnormalities after bleeding, stop and contact a qualified technician or your MotoSport service partner for inspection.

Related Shopping Categories

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Shop Brake Lines for a 2021 Can-Am Outlander 850 XT ATV.

Shop Brake Tools for a 2021 Can-Am Outlander 850 XT 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.