Thread: Brake fluid dropping, no leaks, pedal goes to floor

I'd go with master cylinder.

Unbolt the master cylinder from the servo and see if there is fluid leaking from the rear of it.

If it was mine I would pull the vacuum pipe, dip some clear tube in down to the bottom of the servo, pop my thumb on the end and pull it out to see if it lifted any brake fluid. Quick easy check and if you lost a load gives a way of emptying the servo, but it's not mine and I would no recommend it.

If only leaking slightly oyu have to pull the cyliner. However, sometimes the seals just fo or reverse internally and they don't lean and don't work which is more fun

Bloody Hondas!