How to Bleed & Replace Brake Fluid on a 2004 Polaris Sportsman 700 4X4

Shop parts for a 2004 Polaris Sportsman 700 4X4 ATV.

This MotoSport guide gives step-by-step, model-specific instructions for flushing and replacing the brake fluid on a 2004 Polaris Sportsman 700 4X4 (MMY). Follow these steps carefully to restore firm braking performance and avoid contamination of the hydraulic system. Read the whole procedure before starting and work in a clean, well-lit area.

What you need

  • DOT 4 brake fluid (Polaris recommends DOT 4 for the Sportsman 700)
  • Clear plastic tubing that fits snugly over the bleeder nipples
  • Clean catch bottle marked for used brake fluid
  • Brake bleeder wrench or 8 mm wrench (bleeder size may vary)
  • Turkey baster or fluid syringe to remove old fluid from the master cylinder reservoir
  • Rubber gloves, safety glasses
  • Rags and a mild brake-cleaner safe surface wipe
  • Optional: hand-held vacuum bleeder or pressure bleeder for faster, cleaner bleeding

Model notes specific to the 2004 Sportsman 700 4X4

  • The Sportsman 700 4X4 has a single front master cylinder reservoir and a rear brake reservoir routed to front & rear calipers through proportioning valves. Reservoir is located under the front storage area; remove the cover to access.
  • DOT 4 is specified for optimal performance and higher boiling point compared to DOT 3. Avoid mixing DOT 5 (silicone) with DOT 4.
  • Bleeder nipples and lines on this model are exposed to mud & water; clean thoroughly before opening to avoid contamination.
  • If the machine has aftermarket brake lines or calipers, follow the component manufacturer's bleeding sequence if different.
  • If you hear a grinding or dragging noise after bleeding, inspect pad mounting pins and caliper slides for corrosion or seized movement common on older Sportsman 700s.

Preparation

  • Park on level ground, set parking brake, and secure ATV with wheel chocks.
  • Raise wheels if needed so calipers are accessible. Support machine with stands rated for ATV use.
  • Clean the reservoir cap area and calipers thoroughly to keep dirt out of the system.
  • Open reservoir cap and diaphragm carefully. Use a turkey baster to remove old fluid until the level is low but not empty.
  • Fill reservoir with fresh DOT 4 fluid to the fill line and replace cap loosely to limit entry of contaminants while allowing air to escape during bleeding.

Bleeding sequence and method

Use the standard farthest-to-closest sequence to the master cylinder. For the Sportsman 700 4X4 the recommended practical sequence is:

  1. Rear passenger (farthest)
  2. Rear driver
  3. Front passenger
  4. Front driver (closest)

Two common methods are shown below. Choose one and keep reservoir fluid level above the minimum during the entire process.

Method A Manual pump & hold (two-person)

  1. Attach clear tubing to the bleeder nipple and place the other end in the catch bottle partially filled with fresh fluid to prevent air from being sucked back in.
  2. Have an assistant slowly pump the brake pedal 3-6 times and then hold firm pressure on the pedal.
  3. Open the bleeder nipple about a 1/4 turn. Fluid and air will flow into the tubing and bottle. Close the nipple before the assistant releases the pedal.
  4. Repeat until clear, bubble-free fluid flows and the fluid level in the reservoir remains steady. Top up reservoir as needed.
  5. Move to the next caliper in the sequence and repeat.

Method B Vacuum or pressure bleeder (single-person, cleaner)

  1. Connect vacuum pump to the bleeder nipple or connect a pressure bleeder to the master cylinder reservoir per tool instructions.
  2. If using vacuum, crack the bleeder nipple and pull until clear fluid with no bubbles appears. If pressure bleeding from the reservoir, open each bleeder until fluid runs clear.
  3. Always keep the reservoir topped up during the process.
  4. Follow the same farthest-to-closest sequence.

Finishing steps

  • After all calipers are bled, pump the brake pedal gently. Pedal should feel firm and not sink to the floor.
  • Clean bleeder nipples and torque lightly to spec if available (do not over-tighten). If you do not have a torque spec, snug should be sufficientavoid stripping the nipple.
  • Top the reservoir to the full line, reinstall diaphragm and cap tightly.
  • Dispose of used brake fluid properlydo not pour down drains or on the ground.
  • Test brakes at low speed in a safe area before regular riding. Check for leaks, pedal travel, and proper braking on both front & rear circuits.

Troubleshooting & service tips

  • Persistent soft pedal after bleeding indicates trapped air, a leak in the system, or a failing master cylinder. Re-inspect hose clamps, caliper seals, and master cylinder pushrod.
  • If calipers are sticky or pads drag after bleeding, remove calipers, inspect pistons & slides, and clean or rebuild as needed. Corrosion on older Sportsman 700 calipers is common.
  • Replace rubber hoses if they show swelling or cracking. Age-related hose failure is common on 2004 models.
  • Record service date and fluid type in your maintenance log. Brake fluid should typically be replaced every 1-2 years depending on use and exposure to water/mud.

Safety reminders

  • Brake fluid is corrosive to paint & plasticswipe spills immediately with clean rags and rinse surfaces if needed.
  • Never reuse brake fluid; always use fresh DOT 4 from a sealed container.
  • Work with someone present when possible and keep the ATV supported securely; do not rely on a jack alone.

Following this MotoSport procedure will restore brake system performance and help maintain the longevity of your 2004 Polaris Sportsman 700 4X4 braking components. If you encounter internal caliper damage, master cylinder failure, or persistent issues, consult a qualified ATV technician for repairs or parts replacement.

Related Shopping Categories

Shop Brake Fluid for a 2004 Polaris Sportsman 700 4X4 ATV.

Shop Brake Bleeders for a 2004 Polaris Sportsman 700 4X4 ATV.

Shop Brake Pads for a 2004 Polaris Sportsman 700 4X4 ATV.

Shop Brake Lines for a 2004 Polaris Sportsman 700 4X4 ATV.

Shop Brake Tools for a 2004 Polaris Sportsman 700 4X4 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.