How to Bleed and Replace Brake Fluid on a 2019 Suzuki King Quad 750AXi 4X4

Shop parts for a 2019 Suzuki King Quad 750AXi 4X4 ATV.

This MotoSport-exclusive guide walks you through safely replacing and bleeding the brake fluid on a 2019 Suzuki King Quad 750AXi 4X4. Follow each step carefully, use the recommended fluid, and note the model-specific tips that help preserve braking performance and component life.

What you need

  • DOT 4 brake fluid (Suzuki typically specifies DOT 4 – confirm in your owner’s manual)
  • Clear hose that fits the bleeder nipple
  • Catch bottle for old fluid
  • Assistant to pump the brake lever/pedal, or a one-person vacuum/pressure bleeder
  • Box wrench set (open-end wrench for bleeder screws)
  • Turkey baster or fluid syringe for removing old fluid from the reservoir
  • Clean rags, gloves, and eye protection
  • Torque wrench (for caliper/hose hardware if you remove lines)

Model-specific notes for the 2019 King Quad 750AXi 4X4

  • The 750AXi uses hydraulic brakes front and rear; the master cylinder reservoir is accessible on the handlebar area (front) and rear pedal reservoir if equipped — confirm which reservoirs your unit has before beginning.
  • Suzuki recommends DOT 4 in many of its ATV models; using the correct fluid is critical. If you don’t have the owner’s manual on hand, verify the fluid spec on the reservoir cap or MotoSport replacement parts listing before topping off.
  • The 750AXi is often used in wet, muddy conditions. Inspect rubber lines and banjo fittings for abrasion and corrosion while you bleed the system; replace any soft, cracked, or swollen lines to avoid future leaks or contamination.
  • If your quad is equipped with an optional parking brake or secondary reservoir, bleed both circuits independently according to the reservoir locations.

Preparation

  1. Park the quad on level ground, turn off the engine, and block wheels to prevent movement.
  2. Clean the reservoir cap area thoroughly to prevent dirt falling into the system when you open it.
  3. Remove the reservoir cap and diaphragm. Use a turkey baster to remove as much old fluid as possible.
  4. Top the reservoir with fresh DOT 4 fluid so it’s near the max mark. Keep the cap off but the fluid level monitored throughout the job to prevent air ingestion.
  5. Locate bleed nipples on each caliper; fit a clear hose over each nipple with the other end submerged in a small bottle partially filled with clean brake fluid to prevent air re-entry.

Bleeding sequence

For the best result on this ATV, follow a logical sequence from the wheel farthest from the master cylinder to the nearest. Typical sequence for the King Quad 750AXi is:

  • Rear caliper (if one rear caliper)
  • Right front caliper
  • Left front caliper

Step-by-step bleed (two-person method)

  1. Have your assistant firmly hold the brake lever or press the brake pedal several times and then hold pressure.
  2. Open the bleeder nipple about 1/4 turn. Fluid and bubbles will flow into the clear hose. Close the nipple before the assistant releases the lever/pedal. Repeat until no air bubbles are visible and the fluid runs clear.
  3. Top up the reservoir after each caliper cycle so the level never drops below the minimum and introduces air.
  4. Move to the next caliper in the sequence and repeat the process.
  5. After all calipers are bled, pump the lever/pedal to build pressure and check for firmness. If soft or spongy, repeat the full sequence.

One-person vacuum/pressure bleeder method

  1. Attach your vacuum or pressure bleeder to the master-cylinder reservoir per tool instructions or fit the vacuum hose to a bleeder nipple at each caliper with the clear hose method and vacuum the caliper until no bubbles appear.
  2. Keep the master reservoir topped during the entire process to prevent air ingestion.
  3. Work in the same far-to-near sequence.

Final checks & cleanup

  • Wipe any spilled brake fluid immediately – it damages paint and plastics.
  • Torque bleeder nipples and any removed hardware to factory specs if available. If you don’t have specs, snug them firmly but avoid overtightening.
  • Refill the reservoir to the maximum level, reinstall diaphragm and cap securely, and ensure caps are sealed to keep moisture out.
  • Test brake feel at low speed in a safe area before riding at normal speeds. Confirm no leaks and consistent pedal/lever firmness.
  • Properly dispose of old brake fluid; do not dump it on the ground or into drains.

Troubleshooting

  • Persistent spongy lever/pedal: re-bleed system and inspect for leaks or a faulty master cylinder.
  • Fluid contamination (dark, dirty fluid): flush completely and replace all fluid. Consider replacing rubber hoses if contamination is severe.
  • Brake drag after bleeding: check caliper pistons for corrosion or sticking; clean or rebuild calipers if needed.

Maintenance intervals & recommended practices

  • Brake fluid is hygroscopic — replace every 1-2 years depending on use and moisture exposure. Heavy off-road use in water and mud warrants annual changes.
  • Inspect lines, banjo bolts, and caliper hardware each service interval and after any heavy impacts.
  • Always use fresh, unopened DOT 4 brake fluid and avoid mixing fluid types.

Following this MotoSport guide will restore firm, reliable braking to your 2019 Suzuki King Quad 750AXi 4X4 and help you spot small issues before they become major repairs. If you need parts or replacement components specific to your MMY, use the MotoSport parts page linked above to find correct OEM & aftermarket items.

Related Shopping Categories

Shop Brake Fluid for a 2019 Suzuki King Quad 750AXi 4X4 ATV.

Shop Brake Bleeders for a 2019 Suzuki King Quad 750AXi 4X4 ATV.

Shop Brake Pads for a 2019 Suzuki King Quad 750AXi 4X4 ATV.

Shop Brake Lines for a 2019 Suzuki King Quad 750AXi 4X4 ATV.

Shop Brake Tools for a 2019 Suzuki King Quad 750AXi 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.