maybe it is slipping,.
clutch and brakes smell the same.....
if you change from 1st to 4th at bout 30km/h and floor it, does it start slipping then.
you may just have a problem with the hydraulics, ie the slave is not releasing fully and its keeping a little amount of pressure on the pressure plate.
try bleeding the system, and while your under the car, check to see the fork movement and if its releasing all the way. if not, then either the pedal needs adjusting or the hydraulics need an overhaul