How to bleed and replace brake fluid on a 2020 Suzuki King Quad 400FSi 4X4 AUTO
Shop parts for a 2020 Suzuki King Quad 400FSi 4X4 AUTO ATV.
This MotoSport exclusive guide walks through safe, correct bleeding and replacement of brake fluid on a 2020 Suzuki King Quad 400FSi 4X4 AUTO. Follow every step carefully. If you are uncertain about any step, stop and consult a certified technician or the official service manual for torque specs and detailed diagrams.
What you need
- DOT-rated brake fluid as specified by Suzuki (use fresh DOT4 unless your manual lists a different rating)
- Clear plastic hose that fits bleed nipples
- Catch bottle for old fluid
- Wrenches to open bleed nipples (size per nipple, usually 8mm or 10mm)
- Brake-fluid syringe or vacuum/pressure bleeder (recommended for clean, fast work)
- Clean rags, gloves, protective eyewear
- Jack or ramp and stands to access wheels if needed
- Small funnel and turkey baster or syringe to top reservoir
Model notes specific to the 2020 King Quad 400FSi
- The King Quad uses hydraulic brake circuits that must be kept free of air. Both front and rear systems should be bled separately.
- Front brake master cylinder is on the handlebar assembly; rear master cylinder is located at the pedal/near the frame. Identify the reservoir(s) before starting.
- Use only the brake fluid type specified by Suzuki; mixing different DOT types or reusing old fluid can degrade braking performance.
- Brake calipers, lines and bleed nipples are accessible but can collect debris; clean around reservoirs and nipples before opening to avoid contamination.
- Take note of ABS sensors or electrical harnesses near brake components. Do not pull on sensors; avoid spilling fluid on electrical connectors or painted surfaces.
Preparation
- Park the ATV on level ground, engage park/neutral and turn off the engine. Secure the vehicle so it cannot roll.
- Clean the area around each brake-fluid reservoir; remove the cap slowly to relieve any pressure.
- Inspect lines, hoses and calipers for leaks or damage. Replace any suspect parts before bleeding.
- Top reservoir to the MAX line with fresh fluid to reduce air entry during the procedure.
- Identify the bleed sequence: always start with the caliper farthest from the master cylinder and work toward the closest. For front brakes that share a single master, that means farthest wheel first. For separate front/rear systems bleed each system independently.
Bleeding method A Vacuum/pressure bleeder (recommended)
- Attach a vacuum bleeder to the bleed nipple or use a pressure bleeder on the reservoir according to the tool instructions.
- With the tool running, open the bleed nipple 1/4 to 1/2 turn. Allow fluid and air to flow until the line runs clear and bubble-free.
- Tighten the nipple while pressure is still applied, then stop the tool and verify reservoir level. Refill to MAX as needed.
- Repeat on remaining calipers in the correct order (farthest to nearest). For rear system, identify the master and repeat the same sequence for its caliper(s).
- After bleeding all calipers, pump the brake lever/pedal several times to confirm firm resistance. Re-check for leaks and reservoir level, then cap the reservoir securely.
Bleeding method B Manual pump & hold (helper method)
- Attach clear hose to the bleed nipple and place the other end in a catch bottle partially filled with used fluid to prevent air re-entry.
- Have a helper slowly pump the brake lever or pedal several times and then hold it under pressure.
- While the lever/pedal is held, open the bleed nipple until fluid flows; close the nipple before the helper releases the lever/pedal. This prevents air from being drawn back in.
- Repeat pump-hold-open-close cycles until fluid from the hose is clear and free of bubbles.
- Always keep the master reservoir topped up during the process to prevent drawing in air.
- Work from farthest caliper to nearest for each system. Finish by tightening bleed nipples to snug, then test lever/pedal firmness.
Tips for a successful procedure
- Never let the master reservoir run dry — introducing air forces re-bleeding and can cause a soft lever/pedal.
- Use new, sealed brake fluid only. Do not mix fluids from different open containers.
- Clean spilled brake fluid immediately; it damages painted surfaces and plastics.
- Replace any rubber lines older than recommended or showing cracks/swelling. Old hoses can trap air and degrade braking feel.
- If brakes remain spongy after thorough bleeding, inspect master cylinder, caliper pistons and hoses for internal faults; these may require overhaul or replacement.
- Dispose of old brake fluid per local hazardous-waste regulations.
Final checks and road test
- Verify bleed nipples are tight and reservoir cap is secure.
- Check all fittings and lines for leaks while an assistant applies steady brake pressure.
- With the ATV on the ground, perform a low-speed test in a safe area to confirm braking performance. Check for consistent lever/pedal travel and immediate brake engagement.
- Re-inspect fluid level after the initial ride and top if necessary.
When to seek professional help
- Persistent soft or sinking pedal/lever after bleeding.
- Visible leaks, damaged hoses or seized calipers.
- If ABS or electronic components behave abnormally after fluid service.
Performing regular brake-fluid replacement and proper bleeding keeps your 2020 Suzuki King Quad 400FSi 4X4 AUTO stopping reliably and extends the life of brake components. When in doubt use factory service documentation or contact a certified technician.
Related Shopping Categories
Shop Brake Fluid for a 2020 Suzuki King Quad 400FSi 4X4 AUTO ATV.
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Shop Brake Lines for a 2020 Suzuki King Quad 400FSi 4X4 AUTO ATV.
Shop Brake Tools for a 2020 Suzuki King Quad 400FSi 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.
