How to Bleed & Replace Brake Fluid on a 2015 Suzuki King Quad 750AXi 4X4 POWER STEERING

Shop parts for a 2015 SUZUKI KINGQD750P ATV.

This MotoSport guide walks you through a professional, safe brake fluid replacement and bleed on the 2015 Suzuki King Quad 750AXi 4X4 POWER STEERING. Follow these steps exactly; brake performance is critical to safety. Work on a level surface, parking brake engaged, engine off unless noted.

What you need

  • DOT 3 or DOT 4 brake fluid (use the spec in your owner's manual; do not mix types)
  • Clear tubing that fits bleed nipples
  • Catch bottle for old fluid
  • Hand or vacuum brake bleeder (large syringe or pump)
  • 10 mm and 8 mm wrenches (confirm bleed nipple size)
  • Clean rags, brake-clean spray
  • Gloves & safety glasses
  • Jack and stands or ramps (if needed to access wheels)

Model-specific notes for the 2015 King Quad 750AXi

  • This model uses hydraulic disc brakes on both front wheels and a disc or drum rear depending on submodel; visually confirm your configuration before starting.
  • Power steering is hydraulic but runs on a separate reservoir and fluid from the brakesdo not introduce brake fluid into power steering components.
  • Brake reservoir is located near the handlebars; it's small, so keep fluid level topped during bleeding to avoid drawing air into the master cylinder.
  • Avoid brake fluid contact with plastic trim and painted surfaces – it damages finishes. Wipe any spills immediately with water and a rag.
  • If your unit has been sitting or shows spongy brakes, replace all fluid rather than topping off to remove moisture contamination.

Preparation

  • Clean the brake fluid reservoir cap area to avoid contamination.
  • Lift and support the ATV only as required to access bleed nipples; never rely on the jack alone.
  • Remove the reservoir cap and diaphragm; cover the opening with a clean cloth to prevent debris while you work.
  • Check the bleed nipple sizes and location on each caliper so you're prepared when bleeding.

Step 1 Remove old fluid from the reservoir

  • Use a turkey-baster, vacuum pump or syringe to extract as much old fluid from the master reservoir as possible.
  • Dispose of old fluid properly; don't return it to the bottle.
  • Top the reservoir with fresh DOT 3 or DOT 4 fluid until near the max mark.

Step 2 Bleeding order & general principle

  • Use the "farthest from master cylinder first" rule: on most King Quad layouts that means rear caliper first, then the front calipers start with the wheel farthest from the master cylinder and finish with the closest. If unsure, visually trace brake lines from reservoir to calipers to determine order.
  • Keep the master reservoir level topped during the entire process to prevent air entry.
  • One caliper at a time: attach clear tubing to the bleed nipple and submerge the other end in a small bottle partially filled with fresh fluid to prevent air return.

Step 3 Manual pump method

  • Have an assistant pump the brake lever or pedal slowly several times and hold it.
  • Open the bleed nipple about a quarter turn with the correct wrench; fluid and air will flow into the tubing. Close the nipple before the assistant releases the lever/pedal.
  • Repeat: pump, hold, open, close, until fluid runs clear with no bubbles.
  • Keep topping the master reservoir between cycles.

Step 4 Vacuum or pressure bleeder method

  • Attach your vacuum bleeder to the bleed nipple and operate per tool instructions while a helper slowly pumps once then releases. Continue until clear, bubble-free fluid appears.
  • Alternatively use a pressure bleeder on the master reservoir following the bleeder tool instructions — this simplifies single-operator bleeding.

Step 5 Repeat for each caliper

  • Move through the bleeding order, replacing fluid in each line until all calipers deliver clear, bubble-free fluid.
  • Final caliper should be the one closest to the master cylinder.

Step 6 Finish up

  • Tighten all bleed nipples snugly; avoid over-torquing. Wipe nipples clean.
  • Fill reservoir to the correct level, reinstall diaphragm and cap securely.
  • Check lever/pedal firmness; it should be firm with no sponginess. If spongy, repeat bleeding.
  • Carefully inspect for leaks at calipers, lines, and master cylinder after a short test ride at low speed.

Tips & safety reminders

  • Never reuse brake fluid. Old fluid contains moisture that lowers boiling point and damages components.
  • Store brake fluid in a sealed container and discard any that has been opened for a long time or contaminated.
  • If you suspect internal master cylinder or caliper seal damage (persistent air, leaks), replace or rebuild the faulty component; bleeding will not fix hardware failure.
  • If you're uncomfortable or unfamiliar with brake systems, have MotoSport-certified technicians service the system.

Performing a full brake fluid replacement and proper bleed restores braking reliability and extends component life. Follow these steps and the King Quad 750AXi will stop as designed.

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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.