How to Bleed & Replace Brake Fluid on a 2012 Honda Rincon 680 4X4
Shop parts for a 2012 Honda Rincon 680 4X4 ATV.
This MotoSport-exclusive guide walks you through safely flushing and replacing the brake fluid on a 2012 Honda Rincon 680 4X4 (TRX680). Follow these steps carefully to restore firm pedal feel, remove moisture from the hydraulic system, and prolong the life of calipers and master cylinder. This procedure is written for the stock hydraulic system found on the Rincon; if your machine has aftermarket master cylinders, braided lines, or a different caliper layout, adapt as needed.
What you need
- DOT 3 brake fluid (Honda OEM spec)—buy fresh, sealed fluid
- Clear 3/16" vinyl tubing long enough to reach a jar
- Small catch jars or bottles, rags, shop towels
- Brake bleeder wrench or appropriately sized box wrench
- Turkey baster or fluid siphon (for reservoir)
- Hand pump or vacuum pump if preferred (optional)
- Jack and stands or ramps to access wheels safely
- Rubber gloves, eye protection
- Fine-point marker or masking tape to label lines if needed
Safety & prep
- Work on a level surface with the engine off, parking brake applied, and key removed.
- Protect painted surfaces from brake fluid; it will damage plastic and paint. Keep rags handy.
- Wear eye protection and gloves. Brake fluid is corrosive to skin and eyes.
- Have replacement parts and fresh fluid ready. Do not let the master cylinder reservoir run dry during bleeding.
Rincon-specific notes
- 2012 Rincon uses a single master cylinder feeding front and rear calipers with conventional hydraulic lines. Honda specifies DOT 3 fluid; DOT 4 can be used if you prefer higher boiling point, but do not mix with DOT 5 (silicone).
- There is no ABS system on the stock 2012 Rincon 680, so bleeding is straightforward hydraulic bleeding.
- The rear caliper is mounted centrally and typically is the furthest station in the bleed sequence. Front calipers are accessed after rear.
- Brake line fittings and bleeder screws can be small and fragile on ATVsuse the correct wrench and avoid rounding nuts.
Step-by-step: Replace brake fluid (full flush)
- Raise the ATV so wheels are off the ground and secure with stands. Remove wheel(s) only if needed for easy caliper access.
- Clean the master cylinder reservoir cap and surrounding area. Remove the cap and diaphragm, then remove as much old fluid from the reservoir as possible with a turkey baster or siphon. Dispose of waste fluid responsibly.
- Refill the reservoir with fresh DOT 3 fluid to the MAX line. Keep the cap off but covered loosely so you can monitor level.
- Locate bleeder screws: rear caliper (typically center/rear), right front caliper, left front caliper. Confirm which caliper is furthest from the master cylinder visually; on the Rincon the rear is normally bled first.
- Attach clear tubing to the bleeder screw you will start with and submerge the other end in a jar partially filled with fresh fluid to prevent air being drawn back in.
- Have an assistant slowly depress and hold the brake pedal. With pedal held, open the bleeder screw about 1/4 turn. Dark fluid and bubbles will flow into the tubing. Close the screw before the assistant releases the pedal. Repeat pump, hold, open, close until fluid runs clear and bubble-free.
- Maintain the reservoir fluid level between MIN and MAX at all times. Add fresh fluid as needed to avoid drawing air into the master cylinder.
- Follow a recommended bleed sequence: rear caliper first, then right front, then left front. If your layout differs, always start with the caliper furthest from the master cylinder and finish with the closest.
- Repeat the bleed cycles on each caliper until only clean, clear fluid flows and pedal feel is firm. Watch for air bubbles in the reservoir as well; continue until none appear.
- Torque bleeder screws snuglydo not over-torque. Wipe all fittings clean and reinstall dust caps where applicable. Refill the master cylinder to the MAX line, reinstall diaphragm and cap, and clean up spilled fluid.
- Lower the Rincon, reinstall any removed wheels, torque wheel nuts to spec, and test the brake pedal with the ATV stationary. It should be firm and not sink. If it feels spongy, repeat bleeding steps.
- Test-ride slowly in a safe area to confirm braking performance before normal use.
Troubleshooting & tips
- If the pedal remains soft after thorough bleeding, inspect master cylinder, calipers, and hoses for internal leaks or collapse. Replace worn components.
- Use a vacuum bleeder or one-way bleeder kit to speed the process and reduce the need for an assistant. MotoSport stocks vacuum and pump bleeder tools to make this easier.
- Label lines if you have aftermarket crossover lines or modified plumbing so you don't mix circuits during bleeding.
- Always dispose of used brake fluid at an appropriate recycling center; do not pour down drains or on the ground.
Maintenance interval recommendation
MotoSport recommends inspecting brake fluid annually and performing a full brake fluid flush every 1–2 years for trail use, or sooner if you ride in wet, dusty, or high-load conditions that introduce moisture or contaminants into the system.
Final checks
- Confirm no leaks around calipers, hoses, fittings, or the master cylinder. Tighten as needed.
- Ensure the parking/engine cutoff and any safety switches were not disturbed during work.
- Document the service date and fluid type used for future maintenance records.
If you need replacement parts, bleeder tools, or DOT 3 brake fluid for your 2012 Honda Rincon 680, MotoSport carries a full selection to get you back on the trail with confident braking.
Related Shopping Categories
Shop Brake Fluid for a 2012 Honda Rincon 680 4X4 ATV.
Shop Brake Bleeders for a 2012 Honda Rincon 680 4X4 ATV.
Shop Brake Pads for a 2012 Honda Rincon 680 4X4 ATV.
Shop Brake Lines for a 2012 Honda Rincon 680 4X4 ATV.
Shop Brake Tools for a 2012 Honda Rincon 680 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.