doesnt sound like brakes arnt bed in. sounds like your calipers(where applicable) and/or master are holding pressure. crack a bleed nipple on the caliper/cylinder. fluid should just drip out. if it squirts, you have a problem. could even be a brake line acting as a 1 way valve. had it happen to me before. You can back trace it up to the master too to eliminate certain parts

Take it back to your mechanic.