hydraulic brakes not working very fast Ok, so I just got new hydraulic brakes, I have not had any like these and they were fitted by professionals and they had replaced the pads as I had contaminated the old ones. After getting these fitted they aren't very sharp at all and can take up to 5 seconds to respond and make my back tyre lock up. So I was just wondering if anyone knows how I could make them better.
Wrapping up all the comments, it appears that your brake mechanism applies okay, but doesn't achieve enough braking performance to slow you quickly.

The likely cause is that you've never bedded in the brake pads.  Apply the links in @Móż comment to bed your brakes in properly.  If they're too naffed you might need new pads to start the bedding in process again.