UK Car Repair: Rolls Royce Brakes Jammed, brake hoses, silver shadows

Question
Dear sir, I live in Malaysia and have 3 Rolls Royces (corniche, and 2 silver shadows). My problem is that 2 of the rolls is suffering from brake seizing after driving in the hot climate here for about 1/2 hr. One of them have right side both brakes jammed, and the other rear left wheel jammed. When it is cooled, it is ok. I understand it is a common problem here for rolls owners. Before I import brake parts from overseas for complete overhaul, would appreciate if you could advise the common areas of the brake system that fails or could fail. Thanks a million.

Answer
What years are the cars,  give serial no's, What you are describing is unusual and the most likely cause is restricted brake hoses, although on two cars at the same time!! Additionally make sure the handbrake callipers have not been adjusted too tight! Where do you live I spent some years in malaya with the British army,  I loved it.