Bleeding and Flushing the Brakes on a 2003 Triumph Tiger 955i
Shop parts for a 2003 Triumph Tiger 955i Motorcycle.The 2003 Triumph Tiger 955i is a classic early-2000s adventure tourer with hydraulic disc brakes at the front and rear. Its front brake is fed by the master cylinder and reservoir on the right handlebar, and its rear brake by a separate master cylinder and reservoir operated by the foot pedal. Bleeding both circuits replaces old, moisture-laden fluid and clears out air. On a bike of this vintage, that alone can transform a vague, soft lever into a firm one.
Why Bleed an Older Tiger
Brake fluid absorbs moisture over time, which lowers its boiling point and makes brake fade more likely under hard use. Moisture-laden fluid can also contribute to internal corrosion of calipers and master cylinders, which is a real concern on an older machine. Many riders refresh the fluid on a regular schedule even when everything seems fine.
Bleed the brakes if:
- The lever feels spongy or pulls closer to the grip than it used to
- The rear pedal feels soft
- The fluid has turned dark or cloudy
- You have replaced brake lines, serviced a caliper, or worked on a master cylinder
Supplies Checklist
- Fresh brake fluid of the type marked on the master cylinder reservoir cap, from a sealed container
- A box-end wrench that fits the bleeder valves
- Clear tubing that fits snugly over the bleeder
- A catch bottle
- A syringe or turkey baster
- A screwdriver or driver for the reservoir caps
- Rags or shop towels
A one-way check-valve bleeder or vacuum bleeder lets you work alone; otherwise, ask a helper to work the lever and pedal.
Setting Up
Support the bike securely upright on its center stand or a paddock stand. Turn the handlebars until the front reservoir is level. Cover the tank, bodywork, and instruments with rags. Most brake fluids damage paint and plastic on contact, so wipe up spills immediately and rinse with water. Clean around the reservoir caps before removing them.
Bleeding the Front and Rear
- Remove the front reservoir cap and diaphragm.
- Draw out most of the old fluid with the syringe, keeping the reservoir from running dry.
- Refill with fresh fluid.
- Attach the clear tube to the bleeder of the front caliper farthest from the master cylinder, with the free end in the catch bottle.
- Squeeze and hold the lever.
- Open the bleeder about a quarter turn. Fluid and air will flow out.
- Close the bleeder before releasing the lever.
- Repeat, topping off the reservoir every few strokes so it never runs low enough to draw in air.
- When fresh, clean fluid with no bubbles flows, close the bleeder.
- Bleed the second front caliper, if your bike has one.
- Bleed the rear caliper with the foot pedal and rear reservoir.
Tips for an Older Bike
Bleeders on older bikes can be stubborn. Use a box-end wrench with firm, steady pressure rather than jerking it, which can round or snap the bleeder. If the first fluid out is very dark, keep going; it may take more fluid than you expect to flush the system completely. Check the brake hoses as you work for cracks or bulges, and keep a close eye on the reservoir level so it never runs low.
Finishing Up
Tighten each bleeder snugly without overtightening. Fill the reservoirs to the correct level marks, reinstall the diaphragms and caps, and clean away any spilled fluid. Check the bleeders and banjo fittings for leaks. Never reuse old fluid; dispose of it properly.
Test Before Riding
The lever and pedal should feel firm and consistent, and neither should slowly sink under steady pressure. Spin both wheels to confirm the brakes are not dragging. Test the brakes at low speed in a safe area before riding normally.
When to Visit a Shop
If the lever will not firm up after several attempts, only firms up after pumping, keeps producing bubbles, or if fluid leaks from a master cylinder or caliper, have the bike inspected. On an older bike, those symptoms can point to worn internal seals or aging hoses, which are best diagnosed by a professional.
Related Shopping Categories
Shop Brake Fluid for a 2003 Triumph Tiger 955i Motorcycle.
Shop Brake Lines for a 2003 Triumph Tiger 955i Motorcycle.
Shop Brake Pads for a 2003 Triumph Tiger 955i Motorcycle.
Shop Stands for a 2003 Triumph Tiger 955i Motorcycle.
Shop Brake Tools for a 2003 Triumph Tiger 955i Motorcycle.
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.
