How to Bleed & Replace Brake Fluid on a 2011 Honda TRX500 Foreman 4X4 (FM1)

Shop parts for a 2011 Honda TRX500 Foreman 4X4 (FM1) ATV.

This MotoSport procedure covers safe, complete brake-fluid replacement and bleeding for the 2011 Honda TRX500 Foreman 4X4 FM1. It is written for owners who want a reliable brake job using common tools or a vacuum/bottle bleeder. Follow all safety cautions and use only recommended fluids for long life and consistent braking.

Model notes & what to know before you begin

  • Brake system type: hydraulic disc brakes front and rear (single rear rotor, dual front calipers). No factory ABS on FM1 models, so bleeding is straightforward hydraulic work.
  • Brake fluid: use DOT 4 brake fluid that meets Honda specifications. Never mix DOT 4 with DOT 5 silicone fluid.
  • Reservoir location: master cylinder reservoir sits under a plastic cap on the handlebar control assembly for front brakes and on the rear master cylinder for the rear brake; keep the caps clean when opened to avoid contamination.
  • Rubber parts: brake lines and caliper seals on older units can be brittle. Inspect hoses, banjo fittings & caliper boots during the job and replace if cracked or leaking.
  • Tools & consumables: clear vinyl tubing, a catch bottle, DOT 4 fluid, wrench for bleed nipples (typically 8mm or 10mm), box end wrench for banjo bolts if needed, turkey baster or suction pump for reservoir, optional vacuum pump or pressure bleeder.

Safety & prep

  • Work on a level surface with the engine off and key removed. Wear gloves & eye protection.
  • Prevent paint damage — brake fluid is corrosive to paint. Cover the body panels under the reservoir and calipers with rags.
  • Keep the reservoir cap and diaphragm clean. Do not run the reservoir dry during bleeding.
  • Have a helper if using the manual pedal/lever-pump method. A vacuum or pressure bleeder allows one-person operation and keeps the reservoir closed more often.

Step-by-step: Replace brake fluid and bleed system

1. Gather tools & prepare ATV

  • New DOT 4 brake fluid, clear tubing to fit the bleed nipple, a clean catch bottle partially filled with a little fresh fluid to keep air out, appropriate wrenches, rags, and a flashlight.
  • Secure the ATV on a stand so wheels are off the ground and can be turned freely if necessary.

2. Clean reservoir & remove old fluid

  • Wipe around the front and rear master cylinder cap. Remove caps and diaphragm to expose fluid. Use a turkey baster to remove as much old fluid as possible from each reservoir.
  • Refill with fresh DOT 4 to the MAX line. Keep reservoirs topped during the entire procedure.

3. Bleeding order (recommended)

  • Start with the caliper farthest from the master cylinder and work toward the nearest. For the TRX500 FM1: rear caliper first, then the left front, then the right front (confirm reservoir plumbing visually before starting — plumbing differences can alter the sequence).

4. Open the bleed nipple & attach tubing

  • Place clear tubing over the bleed nipple and submerge the other end into the catch bottle partially filled with fresh fluid to prevent air re-entry. Crack the bleed nipple about 1/4 to 1/2 turn so it will open but not slip when you pull pressure.

5A. Manual lever/pedal method (helper)

  • Have your helper slowly squeeze the brake lever/pedal several times and hold pressure. While they hold, open the bleed nipple slightly so fluid and air bubble into the tubing. Close the nipple before the helper releases pressure to prevent sucking air back in. Repeat until clear, bubble-free fluid flows and the lever/pedal feels firm.
  • Top off the reservoir between cycles to avoid drawing air into the master cylinder.

5B. Vacuum or pressure bleeding (single-operator)

  • Attach the vacuum pump to the bleed nipple or use a pressure bleeder on the reservoir. Operate according to the tool instructions until the fluid out the tubing is clear and bubble-free. Keep reservoir level topped.

6. Move to next caliper

  • Close the current bleed nipple tight, clean any spilled fluid, then repeat steps 4-5 for the next caliper in the sequence.

7. Final fill & check

  • After the last caliper is bled and all lines are clear, ensure both reservoirs are filled to the MAX line. Reinstall the diaphragm and cap, securing any clamps or screws.
  • Pump the brake lever/pedal several times to verify firm feel. If spongy, repeat bleeding until firm.

Post-service checks

  • Inspect all bleed nipples, banjo bolts and line fittings for leaks. Wipe dry and recheck torque if needed — do not over-torque: snug is sufficient; excessive torque can damage fittings.
  • Cycle the brakes and perform a low-speed test ride in a safe area to confirm proper braking performance. Listen for unusual noises and check for pull or drag.
  • Dispose of used brake fluid properly — it is hazardous waste.

Common issues specific to the TRX500 FM1 to watch for

  • Age-related hose deterioration: inspect the flexible brake hoses for cracking or soft spots. Replace hoses showing any damage prior to bleeding to avoid trapping air from a failing hose.
  • Corroded bleed nipples: older nipples may round-off easily. Use a correctly sized wrench and anti-seize on replacement fittings if you install new hardware.
  • Contaminated reservoir: if the reservoir contains sludge, consider flushing thoroughly and, if necessary, replacing the master cylinder seals. Sludge indicates internal contamination or long-term moisture absorption in old fluid.
  • Brake lever free play: after bleeding confirm the lever free play is within spec; excessive free play can indicate a worn master cylinder or linkage adjustment needed.

Tips for a clean, reliable job

  • Keep the reservoir cap off as little as possible — minimal air exposure prevents moisture pickup and contamination.
  • Use only sealed, fresh DOT 4 fluid from an unopened container; brake fluid is hygroscopic and absorbs moisture from the air quickly.
  • Label the date and mileage on the reservoir or in your maintenance log. Brake fluid is typically recommended to be changed every 1-2 years depending on use and storage.

Performing a complete fluid replacement and careful bleed will restore braking consistency on your FM1 Foreman. If you encounter persistent sponginess, internal leaks or damaged components, consult a professional technician or bring the machine to a qualified shop.

Related Shopping Categories

Shop Brake Fluid for a 2011 Honda TRX500 Foreman 4X4 (FM1) ATV.

Shop Brake Bleeders for a 2011 Honda TRX500 Foreman 4X4 (FM1) ATV.

Shop Brake Pads for a 2011 Honda TRX500 Foreman 4X4 (FM1) ATV.

Shop Brake Lines for a 2011 Honda TRX500 Foreman 4X4 (FM1) ATV.

Shop Brake Tools for a 2011 Honda TRX500 Foreman 4X4 (FM1) 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.