Damn check engine light

I was driving to school last week(highway) and halfway there, the check engine light came on for about 5 minutes. It disappeared after that and haven't seen it since. Is this something I should worry about or not? Plugs are new( proper gap anyone?), wires(1.5 yrs. old), air filter, not to mention there is a boost leak. The leak is on the IC outlet, by the top IC hose(DAMN corrosion), two or three very small holes. Oh, by the way I live in Winnipeg. The city puts down so much salt on the roads to melt snow, it's ridiculous! If it's not this, then what could it be?

Another question, my parking brake seems to stick on the right side. I noticed a bolt on the spring assembly, if I took out that bolt to clean it up, will I have to bleed the brakes?

Thanks to anyone who can help me with these problems. I'd really appreciate it.

as of the check engine light it could be numerous things. dont worry about it unless it comes back and stays on. or if it keeps coming and going, then try and see if you can somehow get some place to check it real quick while its on.

now for the brakes, they might need replaced. thats normally a sign something is bad back there either with brakes/caliper or the park brake cable isnt releasing on that side. you need a second person to pull the park brake while you check to make sure the cable is releasing at the caliper. if that seems fine, then it could be a frozen caliper either piston or the slides. ive seen plenty of cars that the brakes dont seem to release do to slides seizing and all of them have been on cars that go through lots of snow/salt covered roads.

If it just went off then the problem probably went away. If you're still worried go to autozone and have them scan it. I don't think salt would have anything to do with it.