Drove the Roadster through some unusually heavy rain this morning. Got to the office, parked, and went about my day. When leaving for lunch later, I noticed that the friction brakes were doing almost nothing. The brake pedal was stiff, just as it is when the car is off. Managed to drive 80 more miles like this today, mostly depending on regen braking to slow down. To bring the car to a full stop required almost standing on the brake pedal. No warning messages displayed. I realized while pulling into my driveway that I was no longer hearing the brake vacuum pump when releasing the brake pedal at low speed. Car is currently in the garage and partially disassembled to get to brake system parts. Here's what I've checked so far: Fuse 22 (brake pump) - Good Vacuum line between brake pump and master cylinder - Connected on both ends Brake pump - Electrical connector w/ black and green wires is seated properly Wondering how the vacuum pump is triggered - is there a switch on the brake pedal assembly? Is there a simple way to test if the vacuum pump itself is operational? Anything else I should check? Thanks in advance!