Ive been driving my 2014 Model S 60 for a little over a month now and haven't really noticed this until recently. I don't drive particularly aggressively and the regenerative brakes have been more than adequate for 99% of my daily needs, only using the traditional brakes to completely stop. However, I have driven a few times on a cold soaked, or fully charged battery where the regen is completely disabled, and on these occasions, and it feels the hydraulic brakes are far too weak for the weight of the car when travelling at speed. I feel I need to really press down on the brake pedal to get any significant braking power. Without the regen, it sometimes feels like there is no braking power at all when travelling above 100km/h, or if needing to slow very quickly. Does anyone else fine the brakes a little under-powered? Or could this be a problem with my vacuum pump? Any one have any ideas?