How to Bleed & Replace Brake Fluid on a 2019 Polaris Sportsman Touring 850 SP
Shop parts for a 2019 Polaris SPORTST850SP ATV.
This MotoSport guide walks you through a complete, professional bleed and brake-fluid replacement for the 2019 Polaris Sportsman Touring 850 SP. Read all steps before starting. Work in a well-ventilated area, wear eye protection and gloves, and keep brake fluid off painted surfaces.
What you'll need
- DOT brake fluid (see reservoir cap/owner's manual for DOT 3 or DOT 4 specification)
- Brake bleeder kit (hand vacuum, syringe, or pressure bleeder)
- Clear hose that fits bleeder nipples
- Catch bottle, funnel, and clean rags
- Wrenches for bleeder nipples (typically 8mm or 10mm)
- Shop manual or torque wrench for hardware torque values
- Jack or ramps and safety stands as needed
- Plastic tubing or tape to protect painted surfaces
Model notes specific to the 2019 Polaris Sportsman Touring 850 SP
- The Touring 850 SP is heavier and often used with gear and passengers; brake fluid and pads may wear faster than on utility-only machines. Inspect pads and rotors while you're in there.
- Polaris master cylinders can be separate front and rear circuits. Identify each reservoir before bleeding. The farthest caliper from its master cylinder should be bled first.
- Check the reservoir cap or owner's manual for DOT rating. If unsure, use DOT 4; do not mix glycol-based fluid with silicone-based fluids.
- Be cautious of ABS or brake pressure sensors if equipped. If you see electrical connectors near brake components, avoid disconnecting them and consult the service manual for ABS-specific bleed procedures.
- Because the Touring model frequently carries loads, a full bleed is recommended every 1-2 years or whenever brakes feel spongy or after heavy water crossings.
Preparation
- Park on level ground, engage parking brake, remove key, and disconnect the battery if you'll be working near electrical connectors or ABS components.
- Clean the reservoir cap area to prevent contamination. Remove cap and diaphragm, then use a turkey-baster or syringe to remove as much old fluid from the reservoir as possible.
- Top the reservoir with fresh brake fluid so it won't run dry during bleeding. Keep the reservoir capped loosely to limit contamination and evaporation.
- Raise the ATV if needed so wheels turn freely; support safely on stands.
Bleed sequence principles
Always bleed the caliper farthest from the master cylinder first, then work toward the nearest. For many Sportsman setups that means bleeding in this example order (confirm which caliper is farthest for your machine):
- Rear passenger side (farthest from front master, if rear master is at pedal)
- Rear driver side
- Front right
- Front left (nearest)
If your machine has a separate front and rear master cylinder, treat each circuit independently, starting with the farthest caliper from each respective master cylinder.
Bleeding with a vacuum or pressure bleeder (recommended)
- Attach clear hose to bleeder nipple and place other end into a catch bottle partially filled with old fluid so air cannot be sucked back in.
- Open the bleeder nipple about 1/4 to 1/2 turn. If using a vacuum or pressure bleeder, follow the tool instructions to draw fluid while you watch for air bubbles.
- Keep reservoir topped with fresh fluid during the process. Do not let the reservoir run dry.
- When fluid runs clear and bubble-free at the bleeder, tighten the nipple and move to the next caliper in sequence.
- After all calipers are done, pump the brake lever/pedal firmly several times with the engine off to confirm a solid feel. Re-check fluid level and top to MAX line, then reinstall cap and diaphragm securely.
Manual two-person method
- One person slowly depresses the brake lever/pedal while the other opens the bleeder nipple to let fluid escape, then closes it before the lever/pedal is released. Repeat until fluid is clear and air-free.
- Always close the bleeder before releasing the lever/pedal to avoid drawing air back into the system.
Special tips & cautions
- Brake fluid is corrosive to paint and plasticscover and protect body panels. Wipe spills immediately with water, then clean rag.
- Dispose of old brake fluid properly at a hazardous-waste facility.
- If brakes remain soft after thorough bleeding, inspect master cylinder seals, caliper pistons, banjo bolts, lines and hoses for leaks or internal failures. Replace deteriorated rubber lines and seals.
- If your machine has ABS, follow the service manual's ABS bleed sequence; some ABS units require a scan-tool or special bleed step.
- After bleeding, verify brake performance at low speed in a safe area before regular riding.
Final checks
- Confirm fluid level is at MAX line, cap is secure, and reservoir area is clean.
- Torque wheel and caliper mounting bolts to the values specified in the service manual.
- Inspect pads, rotors and lines; replace pads if thickness is near wear limit and replace fluid every 1-2 years for best performance.
- Test ride carefully and re-check for leaks and firm lever/pedal operation.
Following this MotoSport procedure will restore firm brake feel and fresh fluid for safe operation of your 2019 Polaris Sportsman Touring 850 SP. If you encounter persistent issues, consult a qualified technician or refer to the factory service manual for detailed diagnostics.
Related Shopping Categories
Shop Brake Fluid for a 2019 Polaris SPORTST850SP ATV.
Shop Brake Bleeders for a 2019 Polaris SPORTST850SP ATV.
Shop Brake Pads for a 2019 Polaris SPORTST850SP ATV.
Shop Brake Lines for a 2019 Polaris SPORTST850SP ATV.
Shop Brake Tools for a 2019 Polaris SPORTST850SP 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.