Driving along to work this morning at around 40mph, came to my turning put my foot on the brake, nothing happened, pedal went straight to the floor, apart from a tiny bit of resistance at the bottom 10mm. The car just went straight on, I pulled on the handbrake and came to a stop eventually. By a bizzarre set of circumstances my brake fluid level sensor must have stopped working within the last 3 months (the time since I had all new discs and pads all round) and then I had a epic failure on the brake banjo bolt causing my car to lose ALL of its brake fluid without the sensor detecting it, leading me to drive with just a squib of brake fluid left which I pumped out when braking for my turning! Lucky it was 0700 otherwise the road would have been really busy! Anyways, to cut a long story short, the garage behind my factory fixed it for £20 and must have made a better job of bleeding the brakes because they feel a lot more firm underfoot! Near death experience of the day anyway I went to my local motor spares wholesaler (CAS) and they couldnt find the brake reservoir cap with sensor. Should I go to audi or will they rip me to bits for a part I can buy for 1/4 price?