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Re: low brake fluid
Low brake fluid would't affect your engine revs. Are you thinking your brakes may be binding? The easiest way to check is to find a level road then at a slow speed say 10-15mph slip the car into neutral and see if it continues to coast freely. If you have a sticky brake you will feel it drag the car to a stop. If your brake fluid is above the minimum then its ok but don't let it drop below this line or you may allow air into the system.
I can't see how the clutch would affect your problem either.
If you've any more details of the problem that'd help in advice others may give.
Currently in Renoir White's garage:
Renault Trafic 1.7 Petrol Vauxhall Astra 1.4i & in bits Triumph Bonneville T140E & H-D XLH1200