How to Bleed and Replace Brake Fluid on a 2013 Polaris Scrambler XP 850 H.O. EPS
Shop parts for a 2013 Polaris SCRAMX85HE ATV.
This MotoSport-proprietary guide walks you through replacing brake fluid and bleeding the hydraulic system on a 2013 Polaris Scrambler XP 850 H.O. EPS (MMY). Follow every step carefully, use the correct DOT fluid specified for your machine, and observe safety precautions. This procedure applies to the vehicle's front and rear hydraulic brakes; the Scrambler XP 850 H.O. EPS does not use ABS, but it does have EPS (electronic power steering) components that should not be contaminated with brake fluid.
What youll need
- Fresh DOT brake fluid as specified by Polaris (check your owners manual for DOT rating).
- Clear 1/4" vinyl tubing long enough to reach a catch bottle.
- Clean catch bottle and a one-way valve or clamp.
- Appropriate open-end wrenches for bleed nipples (commonly 8mm or 10mm; verify sizes on your machine).
- Flat screwdriver to remove reservoir cap, clean rag, nitrile gloves, eye protection.
- Optional: vacuum bleeder, hand-pump bleeder, or pressure bleeder for faster/cleaner bleeding.
- Torque wrench for bleed nipple final torque if required by Polaris spec.
Model-specific notes for the 2013 Scrambler XP 850 H.O. EPS
- The Scrambler XP 850 H.O. EPS uses handlebar master cylinder(s) for hand/brake inputs and a rear master cylinder for foot brake on some trims; confirm which master cylinders your unit has before starting.
- EPS components and electrical connectors are sensitive to contamination and corrosion; keep brake fluid away from EPS housing, wiring, painted surfaces, plastics and rubber parts.
- DOT brake fluid absorbs moisture over time. Replace fluid every 1-2 years or when brake feel deteriorates, and always use fresh, sealed DOT fluid.
- Bleed sequence should always start at the caliper or wheel cylinder farthest from the master cylinder and progress to the closestthis is critical on multi-caliper systems to remove trapped air effectively.
Preparation
- Work on a level surface with the engine off and the key removed. Secure the ATV on jack stands or a lift so wheels can be rotated and calipers accessed.
- Clean the area around each brake fluid reservoir cap to prevent dirt entering the system. Remove the cap and diaphragm carefully.
- Inspect hoses, lines, calipers and fittings for leaks or damage, and repair before bleeding if any are found.
- Label or note which reservoir feeds which circuit if your Scrambler uses separate reservoirs for front/rear.
Drain & Replace Brake Fluid (basic method)
- Top the reservoir(s) with fresh DOT fluid so the master cylinder never runs dry during the procedure.
- Attach clear tubing to the caliper bleed nipple and route it into a catch bottle partially filled with a little clean fluid to avoid drawing air back in.
- Start with the caliper farthest from the master cylinder. Loosen the bleed nipple about 1/4 turndo not remove it.
- Have an assistant slowly squeeze and release the brake lever or pedal (or use a hand-pump) to push old fluid and air out through the tubing into the bottle. If youre working alone, use a vacuum bleeder or hand pump device on the master cylinder reservoir.
- While the assistant holds the lever/pedal fully depressed, tighten the bleed nipple. Then have the assistant release the lever/pedal. Repeat pumping cycles as needed until clear, bubble-free fluid emerges.
- Keep the master cylinder reservoir topped up during the entire process to prevent air ingestion.
- Repeat the process on each caliper following the sequence from farthest to closest to the master cylinder until all circuits show clear fluid and no air bubbles.
Alternative: Pressure or Vacuum Bleeder
- Attach a pressure bleeder to the reservoir lid or use a vacuum pump at the caliper bleed nipple per tool instructions. These tools speed up the process and minimize contamination risk.
- Observe the same farthest-to-closest sequence and maintain clean connections and proper fluid level in the reservoir.
Final checks and finishing steps
- When bleeding is complete, tighten bleed nipples to the proper snug torque (consult Polaris torque specs; if unavailable, tighten gently to avoid rounding). Wipe off any spilled fluid immediately.
- Refit reservoir caps and clean the exterior. Dispose of old fluid properly per local regulations.
- Check pedal/lever firmness. A firm pedal that holds pressure indicates successful bleeding. If the pedal feels soft or spongy, re-bleed the affected circuit.
- Lower the ATV, remove stands, and perform a low-speed controlled test ride in a safe area to confirm braking performance and absence of leaks.
- Re-check fluid level after a short test ride and top up if needed; reinspect for leaks at fittings and hoses.
Precautions & tips
- Never mix different types of DOT fluid. Use only the type specified by Polaris for your 2013 Scrambler XP 850 H.O. EPS.
- Brake fluid is corrosive to paint and plastics. Wipe spills immediately with a damp cloth and rinse with water.
- Protect EPS and electrical components from exposure to brake fluid. If fluid contacts EPS housing or connectors, clean immediately and inspect for damage.
- If any rubber hoses or seals are swollen, soft or leaking, replace them before bleeding. Old, degraded rubber can introduce air into the system after bleeding.
- Document the date and mileage of fluid replacement for future maintenance reminders.
Troubleshooting
- Persistent spongy brake feel: check for air in the system, damaged hoses, or a leaking master cylinder.
- Brake fade or poor performance after bleeding: verify use of correct DOT fluid and that fluid was not contaminated during the procedure.
- Brake lever/pedal sinks slowly under steady pressure: likely internal leak or master cylinder issue; inspect and repair before riding.
Follow these steps and the specific Polaris service recommendations for safe, reliable braking performance on your 2013 Scrambler XP 850 H.O. EPS. If youre unsure at any step, consult a qualified technician or MotoSport service specialist for assistance.
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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.