How to Bleed and Replace Brake Fluid on a 2017 Suzuki King Quad 400ASi 4X4 AUTO
Shop parts for a 2017 Suzuki King Quad 400ASi 4X4 AUTO ATV.
This MotoSport proprietary guide walks you through a safe, complete brake fluid change and bleed on a 2017 Suzuki King Quad 400ASi 4X4 AUTO. Follow these steps precisely for reliable stopping power and to protect the hydraulic system components.
What you need
- Brake fluid meeting Suzuki's spec (check your owner's manual; commonly DOT 3 or DOT 4 – use the exact spec listed)
- Clear plastic tubing that fits bleed nipples
- Catch bottle for old fluid
- Hand vacuum pump or squeeze bulb bleed kit OR a helper for manual pumping
- Turkey baster or syringe to remove fluid from master cylinder reservoir
- Clean lint-free rags and brake cleaner
- Wrenches sized for bleed nipples (typically 8 or 10 mm) & box wrench for reservoir cap
- Jack, stands or ramps rated for ATV use; wheel chocks
- Gloves and eye protection
- Torque wrench for caliper mounting hardware if you remove components
Safety and prep
- Work on a cool, level surface. Chock wheels and set parking brake.
- Wear gloves & eye protection. Brake fluid is corrosive to paint – protect painted surfaces and wipe spills immediately.
- Do not let old fluid contact rubber boots for extended time; cover exposed components if needed.
- Park the ATV in gear or use the parking mechanism to prevent rolling.
Model notes for the 2017 King Quad 400ASi
- The King Quad 400ASi uses a simple hydraulic disc/drum braking system with a single master cylinder reservoir servicing front and rear circuits. Always confirm fluid type and capacity in your manual before starting.
- This model has no power-assisted brake booster; bleeding is straightforward as long as the reservoir is kept topped up during the process.
- ABS is not fitted on this model year – you do not need ABS-specific cycling procedures.
- The 400ASi's front calipers are relatively accessible; the rear drum or caliper hardware may require wheel removal for easier access to bleed nipples.
- If you find a sticky caliper piston or seized bleeder hardware, replace/repair those components rather than repeatedly bleeding; MotoSport stocks brake caliper rebuild parts for this model.
Step-by-step: Replace fluid and bleed
- Remove the seat and any panels necessary to access the master cylinder reservoir. Clean around the cap and reservoir to keep contaminants out.
- Open the reservoir. Use a turkey baster or syringe to remove as much old fluid as possible without letting debris fall in. Wipe the inside flange with a clean rag. Do not open the system further yet.
- Refill the reservoir with fresh brake fluid to the recommended level. Close the cap loosely so you can top up during bleeding.
- Lift and safely support the ATV so wheels can turn and you can access bleed nipples. Use stands rated for ATVs. If wheels are removed, take care when reinstalling lug hardware to spec.
- Locate the bleed nipples on each caliper or wheel cylinder. The correct bleed order for Suzuki single-reservoir systems is usually the wheel farthest from the master cylinder first &mdash typically: right rear, left rear, right front, left front. Confirm visually which line is farthest from the master cylinder and follow that sequence if different.
- Attach clear tubing to the first bleed nipple and place the other end into a catch bottle partially filled with clean fluid to prevent air being drawn back in. Crimp the tube end if using vacuum pump intermittently so fluid doesn't siphon back.
- Have a helper slowly depress the brake pedal several times and then hold it down, or use a hand vacuum pump/squeeze bulb. With the pedal held down, open the bleed nipple one quarter to half turn to allow fluid and air to escape. Close the nipple before the helper releases the pedal. Repeat until you see clear fluid with no bubbles. If using a vacuum pump, draw until clear fluid appears and then close nipple before releasing pump.
- Keep the reservoir topped up between cycles to avoid drawing air into the master cylinder. Never let the reservoir run dry.
- Repeat for each wheel in the correct furthest-to-closest order until all four circuits yield clean, bubble-free fluid and the pedal feels firm.
- After final bleed, tighten bleed nipples to the proper snugness (do not over-torque). Top reservoir to the correct level and reinstall cap with a clean gasket. Clean any spilled fluid and inspect boots for leaks.
- Lower the ATV, torque wheel nuts to spec if removed, start the engine and apply the brakes several times at low speed in a safe area to confirm firm pedal and correct operation before riding normally.
Common troubleshooting
- Spongy pedal after bleeding: repeat bleeding sequence, ensure reservoir stayed full, check for leaks at fittings/lines, inspect for a faulty master cylinder or air trapped in caliper piston boots.
- Continuous fluid loss: locate leak at lines, fittings, calipers or master cylinder. Replace damaged components rather than just topping up.
- Stubborn bleeders or seized nipples: apply penetrating oil, heat carefully if required, or replace bleeder screws and crush washers. Replace corroded calipers if piston movement is compromised.
Disposal and maintenance
- Used brake fluid is hazardous waste. Collect in a sealed container and dispose of it per local regulations.
- Brake fluid absorbs moisture over time; plan to replace fluid every 1-2 years or sooner if you ride in wet/rugged conditions.
- Inspect hoses annually for cracking or hardening; replace if aged. MotoSport recommends using OEM-spec hoses and hardware for a long-lasting repair on the 400ASi.
Following this MotoSport guide will restore braking performance and help ensure safe operation of your 2017 Suzuki King Quad 400ASi. If you encounter internal master cylinder failure, seized calipers, or persistent air intrusion, consult a qualified mechanic or contact MotoSport for parts and support.
Related Shopping Categories
Shop Brake Fluid for a 2017 Suzuki King Quad 400ASi 4X4 AUTO ATV.
Shop Brake Bleeders for a 2017 Suzuki King Quad 400ASi 4X4 AUTO ATV.
Shop Brake Pads for a 2017 Suzuki King Quad 400ASi 4X4 AUTO ATV.
Shop Brake Lines for a 2017 Suzuki King Quad 400ASi 4X4 AUTO ATV.
Shop Brake Tools for a 2017 Suzuki King Quad 400ASi 4X4 AUTO 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.
