Buff - Its likely your battery.
Sparks - If you've driven with the squealer (metal tab) grinding on your rotors they might need to be replaced. You don't need to bleed the brakes, once you remove the caliper (usually 2 bolts on the back) from the bracket you can use a set of channel locks to force the piston(s) back into the caliper. You'll want to grease the piston contact point on the new pads. Put them into the caliper and bolt it back on. Its a fairly easy job, usually only takes an hour. It might be worthwhile to have the rotors machined by a place like Parts Source to ensure they are still good.
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