When to bleed your bike brakes: 5 unmistakable signs

Why brakes need bleeding

Your hydraulic circuit is a closed system filled with fluid. Over time, air infiltrates — micro-bubbles at fittings, seal wear, or condensation. Air is compressible, fluid isn't. Result: loss of feel and power.

The 5 unmistakable signs

1. Spongy lever THE number 1 sign. You feel a "mush" before the brake bites. Air in the circuit compressing.

2. Abnormally long lever travel The lever almost touches the bar before braking. Not worn pads (check first) — often air taking up space.

3. Inconsistent braking First pull: good. Second pull: spongy. Bubbles moving around in the circuit.

4. Clicking/grinding noise in the lever Small "cric-cric" when actuating slowly. Air passing through master cylinder orifice.

5. Visible bubbles in reservoir Open the reservoir cap on the lever — bubbles rising = air confirmed.

Preventive bleeding schedule

For the complete Shimano bleeding procedure, check our step-by-step guide.

L'Atelier guides you through bleeding any hydraulic brake. Tell it your brake model — exact procedure in seconds.