Vauxhall meriva b breaks cutting in while driving at low speed

When starting to drive the car from being turned off at low speed in first gear the car feels as the brakes are kicking in and grinding really bad. almost like skidding on ice or snow type of sound when the brakes lock. Only lasting a couple of seconds the traction control lights then show up on the dash. Only seems to happen when the car has been parked up for a little while but never any problems after it occurs. Any help would be brilliant !