Have your mechanic check the brake booster. I have had this problem one time before. the booster wasn't working correctly, small hole in the diaphram. it acted as if there was a large vacuum leak letting the engine rev up, but only when the brakes were applied.
Randy
Thks Randy very kind of you to reply.
my car is a 2004 Automatic. My mechanic is of opinion that if there was a hole it would happen all the time. As u know the engine is computerised and he has computer to read all faults on engine. He now thinks the gearbox which is automatic is also computerised. He is going to check that and see if the fault is there, next Monday. Will let you know. Many thanks once again Peter.
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