Bleeding the Brakes on a 1990 Honda CBR600F Hurricane
Shop parts for a 1990 Honda CBR600F - Hurricane Motorcycle.
The 1990 CBR600F Hurricane stops on hydraulic disc brakes at both ends. The front system is fed by a master cylinder mounted at the lever, and the rear system has its own master cylinder worked by the pedal. This bike predates anti-lock and linked braking, so there is no ABS unit to trap air and no combined-brake sequence to follow — each end is bled independently, with nothing more than hand tools and a little patience. That makes it a genuinely approachable job for a rider who is comfortable turning wrenches, provided you work methodically and never let the reservoir run dry.
Know What You Are Bleeding Before You Start
Take a minute to look over the bike rather than assuming. Trace the front brake line from the lever down to the caliper, and confirm the caliper has a small bleeder valve on it. Do the same at the rear, following the line from the pedal-operated master cylinder to the rear caliper. If your particular Hurricane carries two front calipers, you will bleed each one in turn; the procedure below covers that. What you will not find on this machine is a drum brake at the rear — the rear is hydraulic, so it uses fluid and gets bled like the front. If you ever find yourself working on a bike with a cable-operated rear drum, remember that a drum is adjusted, not bled, and this article would not apply to it.
Signs It Is Time to Bleed
The most obvious cue is feel. A lever or pedal that has gone soft, or one that pulls noticeably closer to the grip than it used to, usually means air has found its way into the system. Dark, cloudy, or gritty-looking fluid in the reservoir is another clear signal. So is any recent work that opened the hydraulics: new lines, a caliper rebuild, or master cylinder service all introduce air that has to be purged.
Even with no symptoms at all, brake fluid absorbs moisture from the air over time. Moisture lowers the fluid's boiling point, and a fluid that boils under hard, repeated braking produces vapor — which feels exactly like air in the lines and can cost you real stopping power when you need it most. Many riders simply refresh the fluid on a regular interval as preventive maintenance rather than waiting for a problem to appear.
Tools and Supplies to Gather
- Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container
- A box-end wrench that fits the bleeder valve snugly
- A length of clear tubing that fits tightly over the bleeder nipple
- A small catch bottle for the old fluid
- Rags or shop towels, plus a syringe or turkey baster for pulling old fluid out of the reservoir
- The correct driver for the reservoir cap screws
- Optional: a one-way check-valve bleeder or a vacuum bleeder, which makes a solo job much easier
Setting Up the Bike
Get the machine secure and upright on a stand so it cannot tip while you are leaning on the lever. For the front, turn the handlebars until the reservoir on the master cylinder sits level — an angled reservoir will spill the moment you open it. Lay rags over the painted bodywork, the plastics, and the instrument area before you touch anything. Brake fluid attacks paint and plastic on contact, so any drip should be wiped up immediately, and the area rinsed with water if a spill does happen.
The Bleeding Procedure
- Open the reservoir cap and lift out the diaphragm. Use the syringe or baster to draw most of the old fluid out of the reservoir, but stop before the bottom — do not let the reservoir run dry and pull air into the line.
- Refill with fresh fluid from the sealed container, leaving the reservoir comfortably full.
- Push the clear tubing onto the bleeder valve and route the other end into the catch bottle, with the bottle positioned so you can see the fluid coming through the tube.
- Squeeze the lever and hold it, or press and hold the pedal for the rear.
- Open the bleeder about a quarter turn. Fluid and any trapped air will push out through the tube.
- Close the bleeder before you release the lever or pedal. Releasing with the valve open draws air straight back in.
- Repeat the squeeze, hold, open, close, release cycle. Watch the tube: you are finished at that caliper when clean, fresh fluid runs through with no bubbles in it.
- Check the reservoir every few cycles and top it off. This is the single most common way a home bleed goes wrong.
- If your bike has two front calipers, bleed them one at a time. As a general practice, start with the caliper farthest from the master cylinder and work toward the closest.
- Move to the rear system and repeat the same sequence at the rear caliper.
Finishing Up
When the fluid runs clean at each caliper, close the bleeder snugly with the box-end wrench. Snug is the goal — do not lean on it, because overtightening can damage the valve seat. Fill the reservoir to the level marking on the body, reinstall the diaphragm and cap, and wipe down every surface you touched. Then inspect the bleeder valves and the banjo fittings at the master cylinder and calipers for any sign of weeping or dampness.
Test Before You Ride
With the bike still supported, squeeze the lever and press the pedal. Both should feel firm and consistent, and neither should slowly sink while you hold steady pressure on it. Spin each wheel by hand to confirm the brakes are not dragging. Then, in a safe open area, test the brakes at low speed before riding normally.
When to Stop and See a Shop
If the lever will not firm up after several honest attempts, if it only firms up when you pump it, or if bubbles keep appearing no matter how long you bleed, something else is going on — a worn master cylinder seal, a pinhole in a line, or a fitting that is drawing air. Fluid weeping from the master cylinder or a caliper is the same story. On this bike there is no ABS unit to complicate matters, but if you ever work on a machine that has one and the reservoir has run dry or the unit has been disturbed, the system may need a dealer-level procedure to purge air from the pump itself. In any of these cases, put the tools down and let a shop sort it out. Brakes are not the place to guess.
Related Shopping Categories
Shop Brake Fluid for a 1990 Honda CBR600F - Hurricane Motorcycle.
Shop Brake Lines for a 1990 Honda CBR600F - Hurricane Motorcycle.
Shop Brake Pads for a 1990 Honda CBR600F - Hurricane Motorcycle.
Shop Stands for a 1990 Honda CBR600F - Hurricane Motorcycle.
Shop Brake Tools for a 1990 Honda CBR600F - Hurricane 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.
