How to Bleed & Replace Brake Fluid on a 2019 Textron Alterra 300

Shop parts for a 2019 Textron Alterra 300 ATV.

This proprietary MotoSport guide covers safe, effective brake-fluid replacement and bleeding for the 2019 Textron Alterra 300. Follow these steps precisely to restore firm braking and protect the brake system components.

Tools & Materials

  • Clean shop rags and nylon brushes
  • Brake fluid that matches manufacturer spec & color (consult owner manual; DOT 4 is commonly used)
  • Clear plastic tubing sized to bleeder nipples
  • Catch bottle partially filled with fresh brake fluid
  • Wrenches for bleeder nipples and banjo bolts (metric)
  • Disposable gloves and safety glasses
  • Brake bleeder kit, vacuum pump, or one-way syringe (optional)
  • Jack, stands, or secure ramps to support the ATV safely
  • Torque wrench (for reassembly of banjo/fasteners)

Safety First

  • Work on a level surface with the ATV secure & stable.
  • Brake fluid is corrosive to paint & plastics – protect bodywork and immediately wipe any spills.
  • Wear eye protection and gloves. Keep fluid out of reach of children and pets.

Model Notes for the 2019 Textron Alterra 300 Owner

  • The Alterra 300 uses a compact master cylinder and accessible bleeder nipples at the calipers; some models may have separate front/rear reservoirs. Verify layout on your machine before starting.
  • Use the fluid type specified by Textron in your manual; if unsure, DOT 4 is commonly specified for modern ATVs — do not mix DOT and silicone-based fluids.
  • Banjo bolts at the calipers use crush washers; replace washers if disturbed to prevent leaks.
  • If your unit has an integrated parking-brake drum or combined assemblies, take care not to over-extend or contaminate linings while working on hydraulics.
  • If ABS or electronic brake aids are present (rare on this model), follow manufacturer-specific procedures before and after bleeding to avoid triggering faults.

Preparation

  1. Park ATV on level ground, engage parking brake, remove ignition key.
  2. Raise the machine if necessary so wheels are off the ground and safely support with stands or ramps.
  3. Clean around the master cylinder reservoir cap and bleeder nipples to prevent contamination.
  4. Remove reservoir cap and diaphragm – cover the opening with clean plastic to keep dirt out but leave accessible for topping up.
  5. Inspect brake lines, fittings, and calipers for damage or leaks; replace any damaged components before bleeding.

Bleeding Strategy

Always keep the reservoir topped up during the procedure to avoid drawing air into the master cylinder. Use one of the following methods depending on tools and helpers available.

Two-Person Pump-and-Hold Method

  1. Identify the bleeding sequence. For hydraulic systems, start with the wheel furthest from the master cylinder and proceed to the nearest. On many ATVs this means rear then front or passenger-side furthest first — confirm layout on your machine.
  2. Have an assistant pump the brake pedal or lever several times and hold firm pressure at the end of the stroke.
  3. Open the caliper bleeder nipple about a quarter turn with the clear tubing routed into the catch bottle. Fluid and air will flow out; close the nipple before the assistant releases the lever/pedal.
  4. Repeat pump, hold, open, close cycles until no air bubbles appear and fluid runs clear. Keep reservoir topped between cycles.
  5. Move to the next caliper in sequence and repeat. Finalize by cycling the brakes multiple times and confirming a firm pedal/lever feel.

Vacuum or Pressure Bleeder Method

  1. Attach vacuum pump to bleeder nipple or use a pressure bleeder on the reservoir per tool instructions.
  2. Open bleeder nipple and draw fluid until clear, then close nipple while maintaining vacuum/pressure.
  3. Work through wheels in sequence from furthest to nearest, topping reservoir as needed.
  4. Finish by cycling the pedal/lever to confirm firmness.

Gravity Bleeding (Slow, Minimal Tools)

  1. Attach tubing to bleeder nipple and route into bottle; loosen nipple slightly to allow slow flow. Keep reservoir full.
  2. Allow fluid to slowly flow until free of bubbles, then tighten nipple. This is slow but effective if patience is applied.

Bleeder Nipple Care & Reassembly

  • Tighten bleeder nipples to the specified snugness; avoid excessive torque that strips threads. If you disturbed banjo bolts, use new crush washers and torque to spec.
  • Clean any spilled fluid, re-fit reservoir diaphragm and cap, and ensure the reservoir is filled to the correct level.
  • Pump the brakes with the ATV on the ground until lever/pedal is firm and consistent.
  • Check for leaks at hoses, calipers, fittings, and the master cylinder after a short test ride at low speed.

Post-Service Checks

  • Confirm pedal/lever firmness and brake engagement under light braking before normal use.
  • Inspect fluid level & bleed points after a short ride and retighten fittings if needed.
  • Dispose of old brake fluid responsibly per local regulations.

Troubleshooting

  • Persistent spongy brake feel after bleeding: re-check for air in system, leaking fittings, or a failing master cylinder.
  • Brake drag after bleeding: caliper pistons may have been pushed too far; retract pistons slightly, check hose routing, and ensure caliper bolts are torqued correctly.
  • If you find contaminated fluid or rust inside components, replacement of lines/calipers may be necessary to ensure safe operation.

Follow this MotoSport procedure to keep your 2019 Textron Alterra 300 stopping strong and reliable. If you are unsure about any step or detect component failure, consult a qualified technician.

Related Shopping Categories

Shop Brake Fluid for a 2019 Textron Alterra 300 ATV.

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Shop Brake Lines for a 2019 Textron Alterra 300 ATV.

Shop Brake Tools for a 2019 Textron Alterra 300 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.