Make sure none of the stop/tail turn signal dual filament bulbs dont have a broken filament thats touching the other one inside the bulb--see that often and its easy to miss,cause the bulbs still "work"..
Also make sure it has the right bulbs,I see lots of older vehicles that are supposed to have 1157 or 1034 bulbs with 2057's stuck in them--they are "opposite",you'll have bright running lamps,and dim brake lamps..and having one wrong bulb can throw things off..
I know you said you replaced the bulbs,but you didn't say "all" the bulbs..as stated already,bad grounds and lamp sockets can cause this too,one ground wire under the dash attaches near the e-brake and it can get pulled off,and cause a lot of issues,and the ones at the radiator support...also the turn signal switch can cause this too..but not often..
Also make sure it has the right bulbs,I see lots of older vehicles that are supposed to have 1157 or 1034 bulbs with 2057's stuck in them--they are "opposite",you'll have bright running lamps,and dim brake lamps..and having one wrong bulb can throw things off..
I know you said you replaced the bulbs,but you didn't say "all" the bulbs..as stated already,bad grounds and lamp sockets can cause this too,one ground wire under the dash attaches near the e-brake and it can get pulled off,and cause a lot of issues,and the ones at the radiator support...also the turn signal switch can cause this too..but not often..




