My daughter has a 53 Polo and went for a mot this week and they gave her an advisory note saying the rear pads and discs need changing,when i took of the calliper it was seized the piston would not move i had a strong g clamp on it.
Phoned the garage to ask for a priced a he said that they don't seize bring it in and we will sort it out.You could see the difference in the pads which i think would make you look deeper.
I've had one fail on a seized calliper,what sort of price is a new one,and should this have been picked up on the mot