Motorcycle ABS: how it works and what to check in the garage

ABS stops the wheel from locking under hard braking, so the bike stays stable and steerable. November wet leaves and cold tarmac are exactly where it earns its keep.

• Find the ABS light on the dash. It comes on with the ignition and goes out once the bike moves off and picks up a little speed. If it stays lit, ABS is disabled and the brakes work as conventional ones.
• Know what the system does: wheel sensors track rotation, and when a wheel is about to lock, the control unit rapidly drops and restores pressure in the brake circuit. Pulsing at the lever and pedal is normal, not a fault.
• Inspect the sensors and tone rings near the wheels. Dirt, grease or metal debris disturb the signal. Wipe only with a soft cloth, with no force and no sharp tools.
• Check the brake fluid level and condition. Old, moisture-laden fluid hurts the whole circuit, ABS unit included. Replacement interval is in the owner's manual.
• Don't test ABS on slippery ground. Try it on a dry, safe, empty area with a firm, even squeeze on the lever.