How to Bleed and Replace Brake Fluid on a 2016 Honda Rancher 420 4X4 DCT IRS (FA5)
Shop parts for a 2016 Honda Rancher 420 ATV.
Overview
This guide written for MotoSport walks you through safely flushing and bleeding the hydraulic brakes on a 2016 Honda Rancher 420 4X4 DCT IRS (FA5). Follow each step carefully & use the correct DOT fluid. Work on a cool, leveled machine with the parking brake off only when specified.
What you need
- Honda-approved DOT 4 brake fluid (clean, unopened)
- Clear tubing that fits the bleeder nipples
- Brake fluid catch bottle or jar
- 10 mm wrench (bleeder nipple size)
- Turkey baster or fluid syringe (for master cylinder)
- Brake cleaner, rags, disposable gloves
- Floor jack or ramps and sturdy stands
- Assistant for manual bleeding OR hand-held vacuum pump
- Small funnel that fits the master cylinder reservoir
Important model notes for the FA5 Rancher 420
- The Rancher 420 DCT IRS has independent rear suspension components that can be disturbed if you jack incorrectly — use the factory lift points and support the frame.
- The brake master cylinder reservoir is located under a small cover on the handlebar area; it is compact, so keep the reservoir level high during the procedure to prevent air ingestion.
- The Rancher uses single-disc front brakes and a rear disc. Bleeder nipples are standard; the rear caliper bleeder faces aft on many FA5 models — confirm orientation before fitting tubing.
- If your machine has ABS sensors or aftermarket accessories, protect them from spilled fluid & avoid pressurizing the system beyond normal hand pressure.
- Honda recommends DOT 4. Using DOT 5 (silicone) will ruin the system.
Prep
- Park on level ground, shift into park/neutral as applicable, set the parking brake, and remove the key.
- Clean the master cylinder cap area with brake cleaner and rags to prevent contamination when opening the reservoir.
- Raise the wheels one at a time if you need wheel access. Support securely.
- Inspect lines, hoses, calipers, and rotor condition. Note any leaks, collapsed hoses, or seized caliper slides — these must be repaired before bleeding.
Step-by-step fluid replacement & bleeding
1. Old fluid removal from reservoir
- Open the master cylinder reservoir. Use a turkey baster or fluid syringe to remove as much old fluid as possible. Wipe the inside of the cap and reservoir lip. Do not let dirt fall in.
- Refill reservoir with fresh DOT 4 to the full mark. Close cap loosely to keep contaminants out but allow topping as you bleed.
2. Decide bleed order
Standard order: farthest wheel from master cylinder first. For the Rancher 420, bleed sequence generally is: rear, right front, left front. Confirm which brake line branch is farthest if your layout differs.
3. Manual two-person bleeding (recommended)
- Attach clear tubing to the bleeder nipple and submerge the other end in a small catch bottle partially filled with fresh fluid (prevents air re-entry).
- Have your assistant sit on the machine or operate the brake pedal/lever while you open & close the bleeder. For lever systems, pull to full lever stroke and hold; open bleeder 1/4 turn, fluid & bubbles will flow; close bleeder before the assistant releases the lever. Repeat until no bubbles and fluid runs clear.
- Keep reservoir topped with fresh fluid throughout. Do not let it run dry.
- Proceed to next wheel in the correct sequence.
4. One-person vacuum or pressure bleeding
- Use a hand-held vacuum pump on the bleeder nipple while slowly pumping the brake lever/pedal to circulate fluid. Keep reservoir full.
- Alternatively, a pressure bleeder on the master cylinder is fastest but do not exceed recommended low pressure (2-5 psi) and monitor reservoir level.
5. Final reservoir flush
- Once all wheels bleed clear of air, remove most fluid from reservoir and refill with fresh fluid for a final top-up to the full mark.
- Wipe all fittings & caliper areas. Torque bleeder nipples lightly to factory spec if known; snug them with the 10 mm wrench without stripping.
Benchmarks & checks after bleeding
- Brake lever/pedal should feel firm & consistent with no sponginess. If spongy, repeat bleeding sequence.
- Check for leaks at banjo bolts, caliper bleed screws, and hose fittings after a short test ride at low speed.
- Dispose of contaminated fluid per local regulations.
- Re-torque wheel lug nuts if wheels were removed.
Common issues & troubleshooting
- Persistent spongy lever: trapped air in a caliper; remove caliper sliding pins, clean & repack if sticky, then re-bleed.
- Leaking caliper seals: replace seals or caliper; replace fluid again after repairs.
- Collapsed rubber hoses: if hoses swell under pressure, replace them before continuing.
- ABS or valve body concerns: if machine has an ABS-style modulators and you suspect trapped air, a professional shop or dealer-level diagnostic may be required.
Maintenance tips specific to the Rancher 420 FA5
- Service interval: replace brake fluid every 2 years or sooner if contaminated. Heat and moisture absorption reduce DOT 4 performance.
- When operating in wet or muddy environments common for Rancher owners, inspect caliper boots, slides, and hose routing more frequently.
- If you ride with a cargo load or tow frequently, brakes see extra stress — check pads & rotor thickness more often.
- Keep a small spare bottle of DOT 4 and a bleed hose in your toolbox for roadside top-ups; avoid mixing different brands unnecessarily.
Safety reminder
Brake fluid is corrosive to paint & plastics. Clean spills immediately. Never reuse drained fluid. If you are not confident performing hydraulic work, have a certified technician at MotoSport service partners or a qualified shop perform the job.
Related Shopping Categories
Shop Brake Fluid for a 2016 Honda Rancher 420 ATV.
Shop Brake Bleeders for a 2016 Honda Rancher 420 ATV.
Shop Brake Pads for a 2016 Honda Rancher 420 ATV.
Shop Brake Lines for a 2016 Honda Rancher 420 ATV.
Shop Brake Tools for a 2016 Honda Rancher 420 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.
