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

Shop parts for a 2021 Can-Am Renegade 850 ATV.

Overview

This guide from MotoSport covers step-by-step brake fluid replacement and bleeding for the 2021 Can-Am Renegade 850 (REN850). Follow manufacturer torque specs & safety practices. If you’re uncomfortable with brake work, have the job done by a qualified technician.

Tools & Materials

  • DOT 4 brake fluid (fresh, unopened)
  • Clear 3/16" or 1/8" vinyl tubing (fits caliper bleed nipples)
  • Catch bottle or jar
  • Brake bleeder wrench or appropriate sized open wrench (usually 8 mm or 10 mm)
  • Turkey baster or fluid syringe
  • Shop rags, gloves, safety glasses
  • Torque wrench
  • Jack or ATV stand to lift wheels (if needed)
  • Assistant for manual bleeding (optional if using vacuum or pressure bleeder)

Safety & Prep

  • Work on a level surface with the engine off and key removed.
  • Protect painted surfaces & plastics from brake fluid; it damages finish.
  • Wear gloves & eye protection. Keep open container of DOT 4 sealed and discard contaminated fluid.
  • Consult your owner’s manual for any model-specific cautions, reservoir location, and fluid capacity approximations.

Model Notes & Tips for the 2021 Can-Am Renegade 850

  • The 2021 REN850 typically uses a front and rear master cylinder setup integrated into the handlebar (front) and foot-brake combination (rear) depending on configuration. Verify reservoir locations before starting.
  • Some Renegade 850s have combination braking systems or linked brakes; on linked systems bleeding order matters – bleed the caliper farthest from the master cylinder first. For most Renegade layouts that means: rear caliper, right front, left front. Confirm by tracing lines from reservoir to calipers.
  • The Renegade uses DOT 4; do not mix with DOT 3 or DOT 5 silicone. Using incorrect fluid can cause failure.
  • Use OEM or quality replacement bleeder valves if corrosion or rounding is present. Replace rubber caps to keep dirt out.
  • If the machine has ABS or an electronic brake control, follow specific service procedures for that system — consult service manual for ABS bleed sequence or diagnostics before replacing fluid.

Step-by-Step Brake Fluid Replacement & Bleeding

1. Inspect & Prepare

  • Clean around reservoirs. Remove caps slowly to avoid introducing dirt.
  • Note fluid level and color. Dark or contaminated fluid needs full replacement.
  • Top reservoir to just below cap thread with fresh DOT 4; do not overfill.

2. Remove Old Fluid from Reservoirs

  • Use a turkey baster or syringe to remove as much old fluid from each master cylinder reservoir as possible. Dispose properly.
  • Refill with fresh DOT 4 to the recommended level.

3. Bleeding Order

Common recommended order for Renegade 850 linked or standard systems: rear caliper first (farthest from master), then right-front, then left-front (closest to master). If your machine layout differs, identify which caliper is farthest from the reservoir and proceed accordingly.

4. Manual Bleeding Procedure (Assistant Method)

  1. Place clear tubing over bleed nipple and submerge other end in a small jar partially filled with fresh fluid to avoid air re-entry.
  2. Have an assistant slowly pump the brake lever/pedal several times and hold it in the applied position.
  3. Open the bleed valve about a 1/4 turn to allow fluid and air to exit into the tubing. Close the valve before the assistant releases the lever/pedal.
  4. Repeat until clear bubble-free fluid appears, keeping reservoir topped off to prevent air ingress.
  5. Tighten bleed nipple to spec and move to the next caliper in the bleed sequence.

5. Vacuum or Pressure Bleeder Method

  • Connect vacuum pump to bleed nipple or use pressure bleeder on reservoir per tool instructions.
  • Operate until clear, bubble-free fluid flows. Keep reservoir level monitored.
  • Close bleed nipples and verify firm lever/pedal feel.

6. Final Reservoir Fill & Check

  • Fill reservoirs to correct level and secure caps with fresh diaphragms if available.
  • Wipe any spilled fluid from painted surfaces immediately.
  • Cycle brakes several times to confirm firmness. Park and recheck for leaks around calipers, hoses, and fittings.

Torque & Fitting Notes

  • Bleeder screws should be snugged to manufacturer specification. If unknown, tighten carefully to avoid rounding — typically light torque, then final seating.
  • Replace any corroded or rounded fittings. Use new crush washers where applicable.

Troubleshooting

  • Spongy brake lever after bleeding: likely air remains. Re-bleed, ensuring reservoir never runs low.
  • Continual fluid loss: inspect for leaks in hoses, calipers, master cylinder seals, and fittings.
  • If ABS-equipped and you cannot purge air, the ABS unit may require a dedicated bleed procedure or diagnostic cycle at a dealer or with service tools.

Maintenance Interval & Recommendations

  • Brake fluid should be replaced every 1-2 years depending on use and exposure to water/contamination. Heavy off-road use or frequent water crossings shortens interval.
  • Inspect lines, calipers, and reservoir seals regularly. Replace rubber hoses if soft, cracked, or swollen.
  • Store replacement DOT 4 away from moisture and air to prevent degradation.

Post-Service Checklist

  • Confirm lever/pedal feel is firm and consistent.
  • Check for leaks during a short, low-speed test ride in a safe area.
  • Re-torque fittings after initial ride if necessary and re-inspect brake fluid level.

Contact & Parts

For model-specific replacement parts, seals, bleed screws, or service components for your 2021 Can-Am Renegade 850, refer to MotoSport parts for exact fitment and OEM-equivalent items.

Related Shopping Categories

Shop Brake Fluid for a 2021 Can-Am Renegade 850 ATV.

Shop Brake Bleeders for a 2021 Can-Am Renegade 850 ATV.

Shop Brake Pads for a 2021 Can-Am Renegade 850 ATV.

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

Shop Brake Tools for a 2021 Can-Am Renegade 850 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.