Bleeding the Brakes on a 2020 Kawasaki KLE650 Versys ABS

Shop parts for a 2020 Kawasaki KLE650 - Versys ABS Motorcycle.

What You're Working With on This Versys

The 2020 Kawasaki KLE650 Versys ABS runs hydraulic disc brakes at both ends, and the ABS designation means an anti-lock modulator sits plumbed into the system between the master cylinders and the calipers. Both the front lever and the rear pedal push fluid through that modulator on its way to the calipers. This model does not use a linked or combined braking system, so the front lever and the rear pedal each operate their own independent circuit — which is good news for a home mechanic, because it means you bleed the front and the rear as two separate jobs with no required sequence between them.

The front circuit is fed by a handlebar-mounted master cylinder with a small reservoir under a screw-on cap. The rear circuit uses a reservoir mounted low on the bike near the pedal. Both are conventional enough that a rider with moderate mechanical confidence can service them in a garage with hand tools.

Why and When to Bleed the Brakes

Brake fluid is hygroscopic, meaning it pulls moisture out of the air over time. That absorbed water lowers the fluid's boiling point, and under hard or repeated braking the fluid can boil and create gas in the lines — the classic symptom being a lever that goes soft or long just when you need it most. Moisture also darkens the fluid and can corrode internal components. For those reasons, many riders refresh the fluid on a regular interval even when nothing feels wrong.

Bleed the system right away if any of these apply:

  • The front lever or rear pedal feels spongy, mushy, or vague.
  • The lever pulls noticeably closer to the grip than it used to.
  • Fluid in either reservoir looks dark, cloudy, or contaminated with debris.
  • You've just replaced a brake line, serviced a caliper, rebuilt a master cylinder, or replaced pads in a way that pushed fluid back up the system.
  • The bike sat for a long stretch, or the fluid's age is simply unknown to you.

Tools and Supplies to Collect

  • Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container. Do not substitute a different type.
  • A box-end wrench that fits the bleeder valve snugly — a box-end grips better than an open-end and is less likely to round the hex.
  • A length of clear tubing that fits tightly over the bleeder nipple, plus a catch bottle to hang it in.
  • Rags or shop towels, and a syringe or turkey baster for pulling old fluid out of the reservoir.
  • The correct driver for the reservoir cap screws.
  • Optional but helpful: a one-way check-valve bleeder or a vacuum bleeder, either of which makes a solo job much easier.

Setting Up Before You Open Anything

Get the bike stable first. Put it on a stand or otherwise support it upright so it can't tip while you're leaning on the bars. For the front circuit, turn the handlebars until the reservoir sits level — a tilted reservoir will spill. Then drape rags over the tank, the plastics, the instrument cluster, and anything else below the reservoir. Brake fluid attacks paint and many plastics on contact, so treat every drop as a problem: wipe it up immediately and rinse the area with water if it reaches a painted surface.

Bleeding the Front Brake

  1. Remove the reservoir cap and diaphragm. Use the syringe or baster to draw most of the old fluid out of the reservoir, leaving the bottom covered so you don't push air into the master cylinder.
  2. Refill with fresh fluid from the sealed container, keeping the level near the upper mark.
  3. Slip the clear tubing over the front caliper bleeder and route the other end into the catch bottle, with the bottle positioned so the tubing runs upward from the bleeder before dropping — this traps air at the high point and keeps it from being drawn back in.
  4. Squeeze the front lever slowly and hold it. With the lever held, crack the bleeder about a quarter turn. Fluid and air will push out through the tubing.
  5. Close the bleeder before you release the lever. Releasing with the bleeder open pulls air back into the caliper.
  6. Repeat the squeeze–hold–open–close–release cycle, topping off the reservoir every few strokes so it never runs low enough to draw air in. Watch the tubing: you're done when the fluid coming through is clean and free of bubbles.
  7. If your bike has two front calipers, bleed each one in turn, finishing with the caliper farthest from the master cylinder if you want to follow the general convention of starting at the far end of the circuit.

Bleeding the Rear Brake

  1. Clean the area around the rear reservoir cap before opening it, then remove the cap and pull most of the old fluid out.
  2. Top up with fresh fluid and fit the tubing to the rear caliper bleeder, running it into the catch bottle.
  3. Press and hold the pedal, open the bleeder a quarter turn, let the fluid run, then close the bleeder before releasing the pedal.
  4. Continue the cycle, checking the reservoir level constantly, until the fluid runs clean and bubble-free.

Finishing Up and Checking for Leaks

When the fluid runs clear at both ends, close each bleeder snugly — firm enough to seal, but not so hard that you crush the sealing face or damage the caliper threads. Fill each reservoir to the correct level marking, reinstall the diaphragm and cap, and wipe down every surface you touched. Then look closely at the bleeder valves and at the banjo fittings at the master cylinder and caliper for any weeping or wetness. A dry paper towel pressed against a fitting will show a leak that your eyes might miss.

Testing Before You Ride, and When to Stop

With the bike still stationary, pull the front lever and press the rear pedal several times. Each should feel firm and consistent, and neither should slowly sink toward the grip or the floor under steady pressure. Spin each wheel by hand to confirm the brakes aren't dragging. Then take the bike to a safe, empty area and test the brakes at low speed before riding normally.

Some problems mean the job is beyond a home bleed. If the lever won't firm up after several honest attempts, if it only firms up after pumping, if bubbles keep appearing no matter how long you bleed, or if fluid is leaking from a master cylinder or caliper, stop and have the bike inspected. Most importantly: if the reservoir ever ran dry, or if the ABS unit or its lines were disconnected, air may have entered the modulator itself. That requires a dealer-level procedure or diagnostic tool to cycle the ABS pump, and it is not something to improvise. Hand the bike to a shop in that case rather than riding it with a soft lever.

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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.