How to Bleed and Replace Brake Fluid on a 2013 Polaris Scrambler XP 850 H.O.

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Follow this MotoSport-exclusive guide to safely and effectively replace and bleed the brake fluid on your 2013 Polaris Scrambler XP 850 H.O. This procedure removes moisture and contaminants, restores pedal feel, and preserves brake component life. Read all steps before starting and work in a clean, well-ventilated area.

Notes specific to the 2013 Polaris Scrambler XP 850 H.O.

  • This model uses DOT 4 brake fluid from the factory. Use fresh DOT 4 meeting SAE J1703 or FMVSS 116 specifications unless Polaris documentation for your unit specifies otherwise.
  • The Scrambler XP 850 H.O. does not have ABS on standard models; if your machine is fitted with an aftermarket ABS module or unique factory option, consult a dealer before bleeding.
  • The brake master cylinder and reservoirs are accessible on the handlebar area for front brakes and near the rear brake pedal for the rear system. Protect painted surfaces & plastics from spilled fluid — DOT fluid will damage finish.
  • Keep the reservoir cap sealed when not topping off to avoid moisture contamination. Replace rubber seals on the reservoir cap if brittle or swollen.
  • Dispose of old brake fluid at a hazardous waste facility. Do not reuse or pour down drains.

Tools & supplies

  • Fresh DOT 4 brake fluid (clean, sealed container)
  • Clear plastic hose that fits snugly over bleeder nipples
  • Catch bottle for old fluid
  • Wrench set for bleeder nipples (typically 8mm or 10mm; confirm fit)
  • Vacuum or pressure brake bleeder (optional but speeds process)
  • Disposable rags, safety glasses, nitrile gloves
  • Hose clamp or small spring clamp (to close hose between strokes if using one-person method)
  • Torque wrench to re-torque caliper bolts after service (check Polaris torque specs)

Preparation

  • Park the ATV on level ground and secure with the transmission in park and the parking brake on. If available, use a lift or jack stands to raise the wheels so rotors can turn freely.
  • Clean around each reservoir and bleeder nipple to prevent dirt entering the system.
  • Remove the reservoir caps and diaphragm. Place a clean piece of plastic or rags around the reservoir to catch drips.
  • Note which reservoir feeds which circuit — on many Scrambler setups one master feeds front calipers and a separate line feeds the rear caliper. Keep the reservoir topped during the procedure to avoid drawing air in.

Bleeding strategy

Always bleed from the caliper farthest from the master cylinder and progress to the nearest. This ensures air is pushed out of the longest lines first. If unsure which is farthest, treat the rear caliper as farthest, then opposite rear/front order by distance. The important rule is farthest-to-nearest.

Step-by-step: Two-person manual bleed (recommended)

  1. Fill the reservoir with fresh DOT 4 fluid to the maximum mark.
  2. Start at the caliper farthest from the master cylinder. Secure the clear hose on the bleeder nipple and place the other end into a catch bottle partially filled with used fluid to prevent air backflow.
  3. One person pumps the brake lever/pedal slowly to a firm stop and holds it. The second person opens the bleeder nipple about a quarter to half turn until fluid & air bubbles flow. Close the nipple before the lever/pedal is released. Repeat until no air bubbles appear and fluid flows clear.
  4. Top off the reservoir between cycles to prevent the master from drawing air.
  5. Move to the next nearest caliper and repeat the same steps until all calipers are bled and fluid runs clean.
  6. After final bleed, ensure bleeder nipples are snug and reservoirs are topped to the correct level. Replace diaphragm & caps.
  7. Clean any spilled fluid, check pedal feel, and test-brake at slow speed in a safe area to confirm operation.

One-person bleed (with hose clamp)

  1. Attach clear hose to bleeder, place bottle beneath. Loosen bleeder nipple just enough to allow fluid to flow.
  2. Pump lever/pedal several times, then hold. Pinch the hose with the clamp to trap fluid between caliper and bottle, then open bleeder to let trapped fluid out, release clamp and repeat. Alternatively, use a vacuum or pressure bleeder for a simpler single-operator job.
  3. Always keep reservoir topped.

Using a vacuum or pressure bleeder

Attach the vacuum pump to the bleeder nipple or a pressure bleeder to the master reservoir per tool instructions. Vacuum/pressure methods are faster and reduce the risk of introducing more air. When using a pressure bleeder, set pressure low & steady, monitor fluid level carefully, and follow the tool manufacturer's safety recommendations.

Post-bleed checks

  • Inspect all hoses, banjo bolts, and caliper connections for leaks. Torque fasteners to Polaris specifications where available; if unknown, tighten to firm factory-appropriate levels and verify at a dealer if necessary.
  • Check pedal or lever firmness under load. If spongy feeling persists, repeat bleeding until solid. Persistent softness may indicate a failing master cylinder, collapsed hose, or caliper seal issue requiring repair.
  • Confirm rear and front brake balance during a controlled slow-speed test. If imbalance or pull occurs, re-check caliper function and line routing.

Common issues & troubleshooting

  • Continuous soft pedal after thorough bleeding: suspect internal master cylinder leak, caliper piston seals, or contaminated lines.
  • Rusty or severely contaminated fluid: replace lines & bleed thoroughly; consider caliper rebuild if pistons are seized or corroded.
  • Leaking bleeder nipples or stripped threads: repair or replace damaged fittings before completing service.

Maintenance intervals & recommendations

  • MotoSport recommends flushing brake fluid at least every 24 months or sooner for heavy use, water exposure, or competitive riding.
  • Always use fresh, unopened DOT 4 fluid and keep fluid containers sealed to avoid moisture pickup.

Perform a careful road/test ride in a safe area after service to verify braking performance. For complex problems, or if you detect leaks or internal master/cylinder failures, contact a qualified technician or your local Polaris dealer for repair.

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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.