How to Bleed & Replace Brake Fluid on a 2011 Suzuki King Quad 400ASi 4X4 AUTO

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This MotoSport-exclusive guide walks you through safely replacing and bleeding the brake fluid on a 2011 Suzuki King Quad 400ASi (MMY KINGQD4ASI). Procedures cover front and rear systems, recommended practices, common pitfalls, and model-specific notes to keep your ATV stopping reliably.

Safety & preparation

  • Work on a level surface with the engine off, key removed, and parking brake engaged.
  • Wear nitrile gloves and eye protection. Brake fluid is corrosive to paint & plastics.
  • Have rags, a drip tray, and a sealed container for old fluid; dispose of fluid per local regulations.
  • Use the correct brake fluid type per Suzuki recommendation for this model (DOT 3 or DOT 4 as specified in your owner manual). Do not mix mineral-oil-based fluids.
  • Keep the master cylinder reservoirs capped when not actively working to prevent moisture contamination.

Tools & supplies

  • New brake fluid (fresh, unopened bottle)
  • Brake bleeder kit: vacuum pump, pressure bleeder, or clear tubing and a clear jar
  • Wrenches for bleeder nipples (usually 8mm or 10mm), a small box wrench recommended
  • Flat screwdriver, pliers, clean rags, torque wrench if tightening caliper hardware
  • Brake cleaner, small funnel, safety drip tray

Understand the system on the 2011 King Quad 400ASi

The 400ASi uses hydraulic braking with separate front and rear master cylinders. The general bleeding principle is universal: start with the caliper or wheel farthest from the master cylinder and proceed to the nearest. On many King Quad layouts, that typically means:

  • For front master cylinder: bleed the right/front then left/front if layout matches factory routing; if unsure, identify the master cylinder outlet and work farthest to nearest.
  • For rear master cylinder: same farthest-to-nearest sequence for left/right wheels as determined by the master cylinder location.

Step-by-step: Replace & bleed brake fluid (recommended method: vacuum or pressure bleed)

  1. Remove old fluid from the master cylinder reservoirs: use a syringe or turkey-baster to suction out as much contaminated fluid as possible. Wipe reservoir clean. Refill to the "MAX" line with new fluid.
  2. Identify bleeder screws on each caliper. Clean area, place a clear hose over the nipple, and route into a jar partially filled with old fluid to check for air bubbles.
  3. Vacuum pump method: attach vacuum hose to the bleeder nipple, start the pump, open the bleeder screw about a 1/4 turn and pull fluid until clear and bubble-free. Close the screw while maintaining vacuum, then release vacuum and move to the next caliper. Keep reservoir topped up to avoid introducing air.
  4. Pressure bleeder method (preferred for a single-operator clean bleed): pressurize the master cylinder reservoir to the specified low pressure per bleeder tool instructions, then open bleeder screws in the same farthest-to-nearest order until fluid runs clear without bubbles. Maintain reservoir level and tool pressure.
  5. Pedal or lever-assisted method (if no tool): have an assistant slowly pump the brake lever/pedal then hold pressure while you open the bleeder 1/4 turn to let fluid out. Tighten the bleeder before they release the pedal. Repeat until no air appears. Caution: do not let the reservoir run low during this method.
  6. Repeat bleeding passes until each circuit produces clear, bubble-free fluid and firm lever/pedal feel. Constantly monitor the master cylinder reservoirs and top up as needed.
  7. Tighten all bleeder screws to proper snugness. Clean all spilled fluid and torque caliper bolts to factory spec if you removed hardware for access (if torque values aren't available, tighten to firm hand+quarter-turn feel and inspect after a short test ride).
  8. Wipe down all components with brake cleaner, reinstall reservoir caps, and ensure caps and diaphragms are seated correctly to minimize moisture ingress.
  9. Test brakes stationary: verify firm lever/pedal with no sinking. Then perform low-speed tests in a safe area to confirm braking performance before regular use.

Bench-bleeding a replacement master cylinder

If you replace a master cylinder, bench-bleed it before installation to remove reservoir and internal air. Secure the cylinder in a vise, connect short hoses from the outlet ports back to the reservoir, fill with fluid, actuate the piston repeatedly until fluid expelled through return hoses is bubble-free, then install on the vehicle and complete the system bleeding as above.

Common problems & troubleshooting

  • Spongy brake lever/pedal after bleeding: likely air remaining; repeat bleeding sequence and ensure reservoir never ran low.
  • Persistent soft feel: check for contaminated or leaking caliper seals, collapsed brake lines, or a faulty master cylinder.
  • Brake drag after bleeding: trapped air in caliper pistons is rare but possible; retract pistons and inspect pads/calipers for sticking.
  • Contaminated fluid: dark, dirty fluid or moisture indicates immediate replacement; replace fluid and bleed thoroughly.

Model-specific notes for the 2011 King Quad 400ASi

  • ABS is not present on this MMY, so bleeding is straightforward without ABS pump cycling procedures.
  • The 400ASi's hydraulic lines are routed across tight frame sections. Inspect for chafing, cracks, and wear while you work; replace any damaged hose to maintain system integrity.
  • If the vehicle has aftermarket handguards or bodywork, remove or shift them for clear access to the front master cylinder and bleeder screws to prevent spills on plastics.
  • Some King Quad owners report easier access to bleeders with the wheels removed and machine supported on a stand; ensure stability and follow jack/stand safety practices.
  • Because the 400ASi is used in mixed conditions, check fluid annually and any time you notice reduced braking performance or after heavy water exposure.

Maintenance schedule & best practices

  • Replace brake fluid every 1-2 years or sooner if fluid appears dark or contaminated.
  • Inspect lines, fittings, pads, and rotors at every service interval; replace pads and resurface rotors as needed.
  • Store new fluid sealed and discard once opened after manufacturer-recommended time to avoid moisture pickup.

Following these steps will restore firm, reliable braking on your 2011 Suzuki King Quad 400ASi. For replacement parts specific to this MMY, including hoses, bleeder screws, reservoirs, and compatible brake fluid, visit our parts page to find the correct components for your ride.

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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.