How To Bleed 2008 Triumph Daytona 675 Motorcycle Brakes

How to Bleed the Brakes on a 2008 Triumph Daytona 675

The 2008 Triumph Daytona 675 stops with a fully hydraulic disc brake system at both ends – a pair of radial-mount calipers up front and a single caliper at the rear, all fed from their own master cylinders. There is no ABS unit and no linked-brake plumbing on this model year, which is good news for the home mechanic: the hydraulic circuit is about as straightforward as a modern sportbike gets, and a careful rider with basic hand tools can flush and bleed it in the garage. This guide walks through the whole job on that exact machine.

When a Bleed Is Due on the Daytona 675

Brake fluid is hygroscopic, meaning it pulls moisture out of the air over time. That moisture lowers the fluid’s boiling point, and on a bike that sees hard braking – track days, canyon runs, or just aggressive commuting – boiling fluid turns to vapor in the caliper and the lever goes soft at exactly the wrong moment. Even if you never boil it, moisture promotes corrosion inside the calipers and master cylinders.

Bleed the system when the front lever or rear pedal feels spongy, when the lever creeps closer to the grip than it used to, when the fluid in either reservoir looks dark or cloudy, or after any work that opened the hydraulics: new lines, caliper service, master cylinder replacement, or a tip-over that let air into the circuit. Many riders also simply refresh the fluid on a routine interval as preventive maintenance, and the 675 rewards that habit with a consistently firm lever.

Tools and Supplies to Have Ready

• Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container – once a bottle is opened, it starts absorbing moisture, so use new stock
• A box-end wrench that fits the bleeder valves snugly
• Clear tubing that fits tightly over the bleeder nipple
• A clean catch bottle for the old fluid
• Rags or shop towels, plus a syringe or turkey baster for emptying the reservoirs
• The correct driver for the reservoir cap screws
• Optional: a one-way check-valve bleeder or a vacuum bleeder, both of which make a solo job much less fiddly

Setting Up Before You Open Anything

Get the bike secure and upright on a stand so it cannot tip while you are leaning on the lever. Turn the handlebars until the front reservoir sits level, and check that the rear reservoir is level too. Then cover the tank, the fairing panels, the gauge cluster, and anything else below the reservoirs with rags. Brake fluid attacks paint and many plastics on contact, so treat every drip as urgent: wipe it up immediately and rinse the area with water.

Before you start, crack each bleeder valve loose a fraction of a turn and re-snug it. Doing this now, while the system is still sealed, tells you the bleeder is not seized and saves you from fighting it later with the lever held in.

The Bleeding Procedure, Step by Step

1. Open the front reservoir and use the syringe or baster to draw out most of the old fluid. Leave a little in the bottom so you do not pull air into the master cylinder.
2. Top the reservoir up with fresh fluid from the sealed container.
3. Push the clear tubing onto the front bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tube’s end stays submerged.
4. Squeeze the front lever and hold it firm. Do not release it yet.
5. Open the bleeder about a quarter turn. Fluid and any trapped air will push out through the tube. Watch the tube, not the lever.
6. Close the bleeder before you let the lever go. Releasing with the valve open draws air back in through the nipple – this is the single most common mistake in the job.
7. Release the lever, then repeat the squeeze-hold-open-close-release cycle. Keep the reservoir topped up every few cycles so it never runs low enough to gulp air.
8. Continue until the fluid coming through the tube is clean, bright, and free of bubbles. Then move to the other front caliper, if your bike has two, and repeat the whole cycle on that side. As a general practice, start with the caliper farthest from the master cylinder and finish with the closest.
9. Move to the rear. Fit the tube to the rear bleeder, press and hold the pedal, open the bleeder a quarter turn, close it, then release. Repeat until the fluid runs clean and bubble-free, topping the rear reservoir as you go.

Finishing the Job Correctly

Snug each bleeder valve down firmly without overtightening – you are sealing on a small taper, and gorilla torque will damage it. Fill both reservoirs to the level marking on the body, reinstall the diaphragm and cap, and wipe down every surface that saw fluid. Look closely at the bleeder nipples and the banjo fittings at the master cylinders and calipers for any weeping; a damp fitting means it needs attention before the bike moves.

Testing Before You Ride

Pull the front lever and press the rear pedal. Both should feel firm and consistent, and neither should slowly sink while you hold steady pressure. Spin each wheel by hand to confirm the brakes are not dragging. Then ride slowly in a safe, empty area and apply the brakes progressively before trusting them at speed.

Troubleshooting and When to Stop

If the lever will not firm up after several rounds of bleeding, if it only firms after repeated pumping, or if bubbles keep appearing no matter how long you work, stop and diagnose rather than ride. Persistent air usually points to a leak at a banjo fitting, a worn master cylinder seal, or a bleeder that is not sealing. Fluid weeping from a caliper or master cylinder is a repair, not a bleed. And if the reservoir ever ran completely dry or a line was disconnected, the system may have swallowed enough air that it needs professional attention – take it to a shop rather than guessing.

Related Shopping Categories

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Shop Brake Tools for a 2008 Triumph Daytona 675 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.