Bleeding the Brakes on a 2005 Honda ST1300
Shop parts for a 2005 Honda ST1300 Motorcycle.
How the 2005 ST1300’s Brakes Are Set Up
Before you touch a bleeder, it helps to know what you are working on. The 2005 Honda ST1300 is a sport-tourer with hydraulic disc brakes at both ends: twin front discs with a caliper on each side, and a single rear disc with its own caliper. Honda also fitted this model with a combined braking layout, where the front lever and the rear pedal each apply some braking force at the opposite end of the bike. On the ABS-equipped version, an ABS modulator sits in the hydraulic circuit as well.
That combined layout is the single most important thing to understand here. It means the system has more bleed points than a plain front-and-rear setup, and the order in which you work them matters. If you are not certain which version you own, look for an ABS indicator light that illuminates when you switch the ignition on, and check the reservoir caps for any markings. If your bike turns out to be the ABS version and you are not comfortable with the extra plumbing, this is a job worth handing to a shop.
Signs That the System Needs Fresh Fluid
Brake fluid is hygroscopic, meaning it pulls moisture out of the air over time. That moisture lowers the fluid’s boiling point, and a boiling fluid creates gas bubbles in the lines — which is exactly the same problem as air in the system. The result is a lever or pedal that feels soft when you need it most, often after a long descent or a hard stop.
Watch for a lever that feels spongy or pulls closer to the grip than it used to, a pedal with a mushy feel, fluid in the reservoir that has gone dark or cloudy, or a lever that slowly sinks while you hold steady pressure at a stop. Bleeding is also required any time the hydraulic system has been opened: new brake lines, caliper service, master cylinder work, or a reservoir that ran dry. Many riders simply refresh the fluid on a regular interval as preventive maintenance, and on a touring bike that sees long days and loaded luggage, that habit is well worth keeping.
Gather the Right Supplies
- Fresh brake fluid of the type marked on your master cylinder reservoir cap, from a sealed container — once a container is opened, it starts absorbing moisture
- A box-end wrench that fits the bleeder valves snugly
- Clear tubing that slips tightly over the bleeder nipple
- A small catch bottle with a little fluid in the bottom
- Rags or shop towels, plus a syringe or turkey baster for emptying the reservoir
- The correct driver for the reservoir cap screws
- Optional: a one-way check-valve bleeder or a vacuum bleeder, which makes a one-person job much easier
Prepping the Bike and Protecting the Finish
Put the ST1300 on a stand so it sits securely upright, and turn the handlebars until the front reservoir sits level. Drape rags over the tank, the fairing panels, the instrument cluster, and anything else below the reservoirs — brake fluid attacks paint and plastic almost on contact. If a drop lands where it should not, wipe it up immediately and rinse the area with water rather than waiting until you finish.
Work in a well-ventilated space with the bike cool, and lay out your tools within reach so you are not fumbling for a wrench with a lever held squeezed. Have the catch bottle positioned low, with the tubing routed so it cannot flop back over painted bodywork.
The Bleeding Procedure, Step by Step
- Remove the reservoir cap and the diaphragm, then use the syringe to draw most of the old fluid out. Leave a little at the bottom so you do not push air into the master cylinder.
- Refill with fresh fluid from the sealed container, and keep the cap nearby to cover the reservoir between steps.
- Slip the clear tubing over the bleeder valve and route the other end into the catch bottle, with the tube’s end submerged in the fluid already in the bottle.
- Fit the box-end wrench onto the bleeder.
- Squeeze the lever and hold it firm — or press and hold the pedal if you are working the rear circuit.
- Open the bleeder about a quarter turn. Fluid and any trapped air will travel down the tube. Watch the tube, not the reservoir.
- Close the bleeder before you release the lever or pedal. Releasing with the bleeder open draws air straight back into the caliper.
- Release the lever or pedal slowly, then repeat the squeeze-open-close-release cycle. Expect to repeat it many times per caliper.
- Top up the reservoir after every few cycles. It must never run low enough to pull air in at the master cylinder — that turns a simple flush into a much longer job.
- Continue until the fluid coming through the tube is clean and free of bubbles, then move to the next bleed point. On a combined system like this one, work through every point in the correct order for your bike, and if you are unsure of that order, stop and consult a shop.
- If your bike has two front calipers, bleed each one in turn rather than trying to do both at once. As a general rule, start with the caliper farthest from the master cylinder you are working.
Closing Up and Checking Your Work
When the fluid runs clean at every point, tighten each bleeder snugly with the box-end wrench — firm, not forced, since overtightening can damage the seat. Fill the reservoir to the level marking, reinstall the diaphragm and cap, and wipe down every surface you touched. Then inspect the bleeder valves and the banjo fittings at the calipers and master cylinder for weeping or dampness. A dry paper towel pressed against each fitting will show a leak clearly.
Test Ride and When to Stop and Call a Shop
Before riding, the lever and pedal should feel firm and consistent, and neither should creep toward the end of its travel while you hold steady pressure. Spin each wheel by hand to confirm the brakes are not dragging. Then test at low speed in a safe, empty area before riding normally.
If the lever will not firm up after several rounds of bleeding, if it only firms up after pumping, if bubbles keep appearing no matter how long you work, or if you see fluid at the master cylinder or a caliper, stop. Air trapped inside an ABS modulator, or a combined system bled out of sequence, generally needs dealer-level equipment to sort out properly. A lever that never comes right is a sign to put the bike on a trailer, not to ride it and hope.
Related Shopping Categories
Shop Brake Fluid for a 2005 Honda ST1300 Motorcycle.
Shop Brake Lines for a 2005 Honda ST1300 Motorcycle.
Shop Brake Pads for a 2005 Honda ST1300 Motorcycle.
Shop Stands for a 2005 Honda ST1300 Motorcycle.
Shop Brake Tools for a 2005 Honda ST1300 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.
