i have problem with my front wheels . can you tell me how i can fix it ?

my vehicle's millage is 115,000 . i want to know like when am driving more than 50 mph and press brake than my steering and car vibrate .. i dont know what is the problem with that .. my friends said i have problem with my brakes i think ... please can you tell me how i can fix it ?
2. i have problem that where we put charger is not working .. i think i have problem with fuse and i cant figure it out where is that located .. do i have to check whole fuse ? or is any specific place ?