2004 Peugeot 307 abs warning light

most good garages have the equipment to read the abs codes,get them read then decide if its a job you can do yourself.have you had an impact on any wheel or work done on the suspension as even changing a wheel can knock or shock wheel sensor

Further to "mr suzuki's " advice , there was a recall on that car re . brake fault on ABS .Dont know if your car was affected or you were notified ? Could be something simple which you could check / fix , as the suggestions here explain possible causes ,

Peugeot 307 ABS

http://www.howtomendit.com/answers.php?id=182834

Hope this helps you .

at a guess i would say its probably one of the rear sensors offside is favourite and it is a coherence fault due to corrosion build up behind sensor which alters the gap between sensor and sonic wheel. Get a read though to make sure!!