Help!! I have a 1998 Porsche 996 with a problem with the brakes, they all come on while driving, When I am driving I can feel all the brakes coming on until the car come to a halt, I have worked out that if I detach the booster vaccum hose and reconnect it the brakes are release until they come on again in a mile or two. I have had it in and out of the garage without success, they changed the Master cylinder and brake booster last week but still they problem exists. Now the brake fluid warning light is on and the brake fluid is at max follow the change last week. They are now thinking that the vaccum hose needs to be replaced but it doesn't appear to be leaking. If anyone can help it will be much appreciated because this is costing my loads and I can't see an end to it. Cheers.