how can i fix the faults on my peugeot 307?

i have two problems that need fixing.the first is a smell of petrol on my 2.0i when i come to a stop at traffic lights etc etc, and the other is a juddering on my brake pedal at low speeds,the abs light does not come on to record any faults .i know a peugeot fitter very well and hes taken it into the workshop but can find nothing wrong,he told me to just try and live with it. This i cant do as it makes the car feel and drive like a piece of crap .Please help if you can