How to Bleed and Replace Brake Fluid on a 2018 Can-Am Outlander 850 XT

Shop parts for a 2018 Can-Am Outlander 850 XT ATV.

This MotoSport proprietary guide walks you through safely replacing and bleeding the hydraulic brake fluid on a 2018 Can-Am Outlander 850 XT. Follow every step carefully to keep brake performance crisp and reliable. If your machine is equipped with any electronic brake-assist or ABS components, consult the Can-Am manual before proceeding; this guide covers standard hydraulic caliper systems found on the Outlander 850 XT.

What you need

  • Manufacturer-specified brake fluid (use DOT4 unless the owner's manual specifies otherwise)
  • Clear plastic tubing that fits the bleeder nipples snugly
  • Catch bottle for old fluid
  • Hand or vacuum bleeder (vacuum recommended for clean, efficient bleeding)
  • Wrenches (typically 8mm-11mm for bleeder screws; inspect your machine)
  • Disposable gloves, shop rags, and brake-clean spray
  • Jack or stable ramps and wheel chocks
  • Small funnel for the master cylinder reservoir
  • Torque wrench for wheel fasteners (if wheels removed)

Safety and prep

  • Work on a flat, stable surface with the engine off and ignition key removed.
  • Wear eye protection and gloves. Brake fluid is highly corrosive to paint and plastics — protect painted surfaces and immediately wipe any spills with water.
  • Keep the master reservoir cap and diaphragm clean. Do not let debris fall into the reservoir.
  • Dispose of old brake fluid per local hazardous-waste guidelines.

Overview of the process

The full job has two parts: flush & replace the old fluid in the reservoir and lines, then bleed each caliper until new fluid free of air appears. Maintain reservoir level throughout to avoid drawing air into the system.

Step-by-step replacement & bleed

  1. Inspect: Check calipers, brake lines, hoses, and fittings for leaks, cracks, or damage. Replace any compromised components before bleeding.
  2. Access reservoir: Remove the seat or panels as needed to reach the master cylinder reservoir. Clean the area around the cap to prevent contamination. Remove the cap and diaphragm.
  3. Siphon old fluid: Use a turkey baster or syringe to remove as much old fluid from the reservoir as possible. Refill with fresh DOT4 fluid to the full mark.
  4. Determine bleed order: Identify the caliper farthest from the master cylinder, then proceed to the next-farthest, finishing at the closest. Typical ATV layout: rear caliper first, then front left, then front right, but confirm routing on your machine.
  5. Prepare caliper: Fit clear tubing over the caliper bleeder screw and submerge the other end in a small bottle partially filled with fresh fluid to prevent air re-entry.
  6. Bleeding with a helper (manual):
    • Have an assistant slowly depress the brake pedal several times and hold it down.
    • Open the bleeder screw about a quarter to half turn to let fluid and air escape. Close the screw before your helper releases the pedal.
    • Repeat until the fluid exiting the tube is clear, bubble-free, and at the new-fluid color.
    • Check and top the reservoir frequently to avoid running dry.
  7. Bleeding with a vacuum or pressure bleeder (recommended):
    • Attach the vacuum pump to the bleeder tubing and open the caliper bleeder screw. Pull until clear, bubble-free fluid flows, then close the screw while maintaining vacuum.
    • Pressure bleeders attached to the reservoir can speed the process but must be used following manufacturer safety steps.
  8. Sequence completion: Work through each caliper in the predetermined order until all are clear. Refinish with the caliper closest to the master cylinder.
  9. Final checks: Tighten all bleeder screws to spec snugness (do not overtighten). Clean any spilled fluid, reinstall the reservoir diaphragm and cap, and confirm the reservoir level is to the full mark.
  10. Seat the system: With the ATV supported and wheels off the ground, apply the brake repeatedly to build firm pedal/lever feel. If levers feel spongy, re-bleed the affected calipers.
  11. Road/test ride: Reinstall wheels, torque wheel fasteners to spec, and perform a low-speed test in a safe area to confirm braking performance before normal use.

Torque, fluid spec, intervals & tips specific to the 2018 Outlander 850 XT

  • Fluid: The Outlander typically calls for DOT4 brake fluid. If uncertain, verify the brake-reservoir cap labeling or the owner's manual. Never mix DOT3 and DOT5 (silicone) fluids.
  • Service interval: Replace brake fluid every 1-2 years or whenever contamination/moisture is suspected. High-use or wet-area riding justifies annual changes.
  • Bleeder locations: The Outlander 850 XT uses single calipers front and rear; access is straightforward but sometimes requires partial wheel or plastic removal for clearance.
  • Parking brake & linkage: If your model has a parking brake or mechanical linkage, inspect and lubricate pivot points during brake service.
  • ABS/electronic systems: If your unit is fitted with optional electronic braking features, do not use high-pressure bench bleeding methods that could damage sensors. Consult the Can-Am electrical/brake section if unsure.
  • Master cylinder caution: If the master cylinder shows heavy corrosion, scoring, or leaks, replace it. Bench-bleeding a removed master cylinder before reinstalling will help eliminate trapped air in the piston bore.

Troubleshooting

  • Persistent spongy lever after bleeding: Re-check bleed order, ensure reservoir never ran dry, inspect for a collapsed flexible hose or master cylinder leak.
  • Air returns even after bleeding: Inspect all hose connections and the master cylinder for leaks or internal failure. Replace faulty parts and repeat the bleed.
  • Brake pedal drops slowly under steady pressure: Check for internal caliper sealing issues or master-cylinder internal bypass; repair or replace as needed.

Aftercare

  • Monitor brake performance for the first few rides — new fluid may take a short time to stabilize.
  • Check reservoir level and condition after initial use and again after 24 hours of riding.
  • Keep a small bottle of DOT4 handy for top-offs; always use fresh, unopened fluid to avoid moisture contamination.

Performing a full fluid replacement and bleed on your 2018 Can-Am Outlander 850 XT prolongs brake component life and preserves stopping power. If you encounter complex ABS/electronic issues or hydraulic-component failures, contact a certified Can-Am technician for diagnosis and repair.

Related Shopping Categories

Shop Brake Fluid for a 2018 Can-Am Outlander 850 XT ATV.

Shop Brake Bleeders for a 2018 Can-Am Outlander 850 XT ATV.

Shop Brake Pads for a 2018 Can-Am Outlander 850 XT ATV.

Shop Brake Lines for a 2018 Can-Am Outlander 850 XT ATV.

Shop Brake Tools for a 2018 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.