How to Bleed & Replace Brake Fluid on a 2014 Suzuki King Quad 400ASi 4X4 AUTO

Shop parts for a 2014 SUZUKI KINGQD4ASI ATV.

Overview

This MotoSport guide walks you through a complete brake-fluid change and bleed on the 2014 Suzuki King Quad 400ASi 4X4 AUTO. Procedures are written for ATV owners who want a reliable, safe brake system — whether you service at home or prep the machine for trail use. Follow all safety steps and use high-quality brake fluid compatible with your owner's manual (DOT 3/DOT 4 compatible fluids are commonly used; verify the manual or factory label for your unit).

Tools & Materials

  • Clean DOT 3 or DOT 4 brake fluid (factory-specified grade)
  • Clear tubing to fit bleed nipples
  • Catch bottle marked for used brake fluid
  • Box wrench or combination wrench set (for bleed and banjo bolts)
  • Bleeder wrench or socket that fits bleed nipples
  • Hand-held vacuum bleeder or pressure bleeder (optional but faster)
  • Syringe or turkey baster for master reservoir cleaning
  • Clean rags, gloves, safety glasses
  • Jack or ramps and jack stands (if required to access calipers)
  • Torque wrench (for banjo fittings and caliper bolts)

Model Notes for the 2014 King Quad 400ASi

  • The King Quad 400ASi 4X4 AUTO uses hydraulic disc brakes front and rear; bleeding order and proper reservoir care are important to avoid air pockets.
  • The master cylinder reservoir is compact and may be harder to access after body panels are left in place — remove necessary shrouds for a clear view to keep contamination out.
  • This model's parking brake and drive system are independent of hydraulic pressure; however, always block the wheels to prevent movement while working on brakes.
  • Banjo bolts and copper crush washers are used on brake lines; replace crush washers if disturbed to prevent leaks.

Preparation

  1. Park the ATV on level ground, set the parking brake if fitted, and place wheel chocks front and rear.
  2. Clean the master cylinder reservoir cap area thoroughly to prevent dirt entering the system when opened.
  3. Remove enough body panels to access the reservoir and each bleed nipple clearly. Keep rags handy to catch spills.
  4. Wear gloves and safety glasses. Brake fluid damages paint & plastics — protect surfaces.

Step 1 — Inspect Fluid & Decide Flush or Top-Off

Check reservoir fluid color and level. Dark, dirty fluid or contaminated fluid needs a full flush. If fluid is clean and level is low, topping off is possible but a full system flush is best practice every 1–2 years or when contamination is suspected.

Step 2 — Drain & Clean Master Reservoir

  1. Siphon or use a turkey baster to remove old fluid from the master cylinder reservoir until minimal fluid remains.
  2. Inspect reservoir for debris or rubber pieces. If present, clean or replace seals as needed.
  3. Refill reservoir with fresh brake fluid to the minimum or mid-level mark to avoid dry pump strokes during bleeding.

Step 3 — Bleeding Strategy — Order & Method

Bleed starting with the caliper farthest from the master cylinder and finish with the closest. Typical order for ATV setups: rear right, rear left (if separate), front right, front left, then master. On King Quad layouts the exact farthest wheel may vary; use the furthest first. Use the method you prefer — manual two-person pump, vacuum bleeder, or pressure bleeder. MotoSport recommends a pressure or vacuum bleeder for consistency.

Step 4 — Manual Two-Person Bleed (If No Pump)

  1. Attach clear tubing to the bleed nipple and submerge the other end in a catch bottle partially filled with used fluid (prevents air re-entry).
  2. One person pumps the brake lever/pedal slowly until firm then holds pressure.
  3. While held, the second person opens the bleed nipple ~1/4 turn to allow fluid and air to escape, then closes it before releasing the pedal/lever. Repeat until clear, bubble-free fluid runs and no air is visible in tubing.
  4. Top up master reservoir frequently to avoid drawing air into the system.
  5. Torque the bleed nipple to factory spec or snugly to stop leaks after each wheel. Replace any worn nipple hardware.

Step 5 — Vacuum or Pressure Bleeder Method

  1. Connect vacuum hose to the bleed nipple with tubing and apply steady vacuum, or use a pressure bleeder on the master reservoir following the tool instructions.
  2. Open bleed nipple and allow fluid to flow until clear and bubble-free. Move in the recommended order across calipers.
  3. Keep the reservoir topped and capped when done.

Step 6 — Flushing Lines & Calipers

Continue bleeding each caliper until you see fresh, clean fluid with no bubbles. For a full fluid replacement, perform at least 3 cycles per caliper or continue until the reservoir is filled with new fluid and the outflow is clear.

Step 7 — Final Checks

  • Ensure bleed nipples are tightened and clean. Wipe any spilled brake fluid immediately.
  • Refill the master cylinder to the correct level and secure the cap. Clean the cap vent area to prevent contamination.
  • Operate the brakes several times to confirm firm pedal/lever feel. If spongy, repeat bleeding until firm.
  • Inspect all lines, banjo bolts, and connectors for leaks while applying moderate brake pressure.
  • Reinstall any removed body panels and torque bolts to specification where applicable.

Torque & Hardware Notes

Banjo bolt torque and caliper mounting torque should be tightened to factory values. If you remove banjo bolts, replace crush washers as one-time-use components. MotoSport technicians recommend using a torque wrench and new washers to ensure leak-free sealing.

Safety & Disposal

  • Never reuse old brake fluid. Dispose of used fluid per local hazardous-waste rules.
  • Brake fluid on painted surfaces damages finish — flush with water and promptly clean any spills.
  • Do not allow moisture into the system; brake fluid is hygroscopic and absorbs water, which shortens service life.

Troubleshooting

  • Persistent spongy lever/pedal: recheck bleeding order, ensure no air in reservoir, inspect for leaking lines or a faulty master cylinder.
  • No fluid flow from a caliper: check for blocked line, kinked hose, or internal caliper corrosion.
  • Brake drag after bleeding: ensure caliper pistons retract freely and that banjo bolt torque is correct; verify pads are properly seated.

Recommended Service Interval

MotoSport recommends flushing and replacing brake fluid every 12–24 months depending on use and exposure to water and mud. Heavy-use or frequent wet operation requires shorter intervals.

Wrap-Up

Following this MotoSport procedure will get your 2014 Suzuki King Quad 400ASi 4X4 AUTO brakes back to firm, reliable operation. If you encounter internal master cylinder failure, seized calipers, or uncontrollable leaks, stop and consult a certified ATV technician for component replacement. Safe trails & safe stopping!

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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.