How to Bleed & Replace Brake Fluid on a 2012 Suzuki King Quad 500AXi 4X4

Shop parts for a 2012 Suzuki King Quad 500AXi 4X4 ATV.

This step-by-step MotoSport guide shows how to safely replace and bleed the brake fluid on a 2012 Suzuki King Quad 500AXi 4X4. Follow these instructions carefully to restore firm brake lever/pedal feel, remove moisture from the system, and keep your ATV stopping reliably. This procedure is proprietary to MotoSport and tailored to the King Quad 500AXi owner’s routine maintenance needs.

What you need

  • New brake fluid: DOT 4 recommended by MotoSport; confirm with your owner’s manual before use (DOT 3 acceptable only if specified).
  • Clear tubing that fits snugly over bleeder nipples.
  • Catch bottle or jar for old fluid.
  • Vacuum bleeder or hand pump (optional but speeds work and reduces air ingestion).
  • Syringe or turkey baster for removing fluid from reservoir.
  • Clean rags, brake parts cleaner, rubber gloves, eye protection.
  • Basic hand tools to access calipers and reservoir; small container for used fluid disposal.

Model notes & observations for the 2012 King Quad 500AXi

  • The 2012 King Quad 500AXi uses hydraulic disc brakes front and rear. There are separate calipers for each wheel; the master cylinder reservoir(s) are under a protective cover near the handlebars and/or behind the front rack depending on accessory fitment.
  • Some model setups include a rear parking brake mechanism. When bleeding rear brakes, ensure the parking brake is released so fluid and air can move freely.
  • There is no factory ABS on this model year; bleeding is straightforward hydraulic work. Keep fluid off painted plastics and racks — brake fluid will damage finishes.
  • Inspect caliper boots, lines, and fittings for cracks or leaks while you service the system. Replace any damaged hoses before bleeding.

Preparation

  • Park the ATV on level ground and secure it in gear or use the parking brake. Block wheels so the machine cannot roll.
  • Clean around the master cylinder reservoir cap and bleeder screws to prevent contamination. Remove dust and debris first.
  • Remove the reservoir cap and diaphragm. Siphon or use a turkey baster to remove old fluid from the reservoir to minimize contamination while you bleed. Do not reuse old fluid.
  • Top the reservoir with fresh DOT 4 fluid to the recommended level. Keep the cap off while bleeding but cover the opening with a clean rag to reduce contamination.

Bleeding strategy

Identify the master cylinder location, then bleed the calipers from the farthest from the master toward the nearest. On many ATVs that means starting with the rear caliper opposite the master and finishing at the caliper closest to the master cylinder. If you are unsure, locate the master and pick the caliper that has the longest line run for the first cycle.

Step-by-step bleed (single-person method using a vacuum or syringe)

  1. Attach clear tubing to the bleeder nipple on the selected caliper and submerge the other end in a catch bottle partially filled with clean fluid to prevent air re-entry.
  2. Open the bleeder screw about 1/4 turn; avoid removing the screw entirely.
  3. If using a vacuum bleeder, apply steady vacuum and open the bleeder until old fluid and air bubbles flow out. If using a syringe, attach to the reservoir and pull fluid while someone operates the brake lever/pedal slowly. If working alone without tools, use the pump-and-hold method below.
  4. When the fluid runs clear and free of bubbles, close the bleeder screw snugly. Wipe any spilled fluid immediately.
  5. Top the master cylinder reservoir back to the proper level after each caliper is bled to avoid drawing air into the system.
  6. Repeat for each caliper working from farthest to nearest. Each caliper may require several cycles to eliminate all air.

Pump-and-hold method (two-person)

  1. Person A slowly squeezes the brake lever or pumps the pedal several times and then holds firm pressure.
  2. Person B opens the bleeder screw until fluid runs out and then closes it while Person A continues holding pressure.
  3. Person A releases the lever/pedal only after the bleeder screw is fully closed.
  4. Top the reservoir and repeat until clear fluid with no bubbles appears.

Finishing up

  • Ensure all bleeder screws are snug but do not over-torque. Snug plus a fraction is sufficient; avoid strippping threads or breaking nipples.
  • Top the master cylinder to the correct level, reinstall the diaphragm and cap, and clean any fluid residue from the ATV.
  • Operate the brake lever/pedal several times to confirm firm feel. If it feels spongy, re-bleed the system until the lever/pedal is firm and travel is correct.
  • Dispose of old brake fluid responsibly at a recycling center or hazardous waste facility — do not pour on the ground or throw in household trash.
  • After a short slow test ride in a safe area, re-check fluid level and bleeder screw tightness. Inspect for leaks again.

Common issues & troubleshooting

  • Persistent spongy brakes: usually due to remaining air. Repeat bleeding with focus on the caliper with visible air. Use a vacuum or pressure bleeder if air is stubborn.
  • Brake lever goes to the bar: check for leaks, collapsed hose, or worn master cylinder seals. Replace damaged hoses or master cylinder components as needed.
  • Fluid contamination/discoloration: replace with fresh DOT 4 fluid; always flush fully rather than topping if fluid is dark or contaminated.

Maintenance tips for long life

  • Change brake fluid every 1-2 years to minimize moisture buildup that reduces boiling point and causes corrosion.
  • Inspect brake lines, fittings, and caliper boots during each change. Replace any cracked lines or torn boots promptly.
  • Keep spare bleeder caps on hand to protect nipples from dirt and oxidation.

Perform brake bleeding on a clean work surface, protect painted surfaces from fluid, and use the correct fluid type. If you encounter uncertain damage to calipers, master cylinder, or hoses, consult a professional technician or MotoSport service resources for parts and repair options.

Related Shopping Categories

Shop Brake Fluid for a 2012 Suzuki King Quad 500AXi 4X4 ATV.

Shop Brake Bleeders for a 2012 Suzuki King Quad 500AXi 4X4 ATV.

Shop Brake Pads for a 2012 Suzuki King Quad 500AXi 4X4 ATV.

Shop Brake Lines for a 2012 Suzuki King Quad 500AXi 4X4 ATV.

Shop Brake Tools for a 2012 Suzuki King Quad 500AXi 4X4 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.