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Sounds like two different problems. I would have the engine computer checked for trouble codes and the body computer for ABS codes. The brake problem could be the master cylinder, the gas smell could be a fuel leak or a problem with the venting system for the gas tank.
Take note if after you have the refrigerant recharged, if there is an unpleasant odor inside the car after a few minutes or a few hours (with the windows up). If so, your refrigerant leak is probably in the evaporator coil behind the dashboard. If you do not notice any odor after recharging the A/C, then add some leak-detecting dye with the freon charge to see if you can tell where the leak is.
could be the T.P.S. sensor(throttle position sensor). It would be worth the money to have a free scan done by an auto parts store, as there are too many electrical problems that can happen, I.A.C. , M.A.P. and O2 sensors, also check to see if all the spark plugs are getting spark, if a plug isnt firing, then it will stutter lose power and could cause the gas odor because its not burning the fuel in that cylinder before it is exhausted.
could be corroded gas lines or gas tank,the carbon cannister or leaking injectors and or if you have a tendancy to fill your tank more at the gas pump to the rim of the filler cap the filler neck that connects to the gas tank by means of a rubber seal may be ruptured. check for gas leaks under the car and in the engine bay,first with the car running and then with the car,s engine shut down and around the filler neck.it could be as simple as having to replace your gas cap. good luck.
if has a fuel odor. it may be the fuel pressure regulator thats bad, it may be flooding out engine. a leaking regulator can cause hard starting, poor fuel economy, stalling, check engine light, gas smell under hood.