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Originally Posted by gmercoleza
I know quite a few people, my dad included, who feel you have to open the reservoir cap first before compressing the calipers with a C clamp. I never understood this - why??? The system is sealed, it's not like air or fluid needs to escape or anything. So I never did it. Every time I've done my brakes I compress the calipers without popping the cap and have never had a problem.
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When you force the pistons back into the caliper bores, you move fluid back into the master cylinder reservoir. The air that was in the reservoir has to go somewhere or the fluid won't move. The reservoir has a tiny hole in the center of the cap for air to flow into the reservoir during normal operation of the system, as the pads wear.
You are now trying to force the air
out through this small hole. It's a hell of a lot easier if you crack the cap and give the air more capability to escape. You probably don't need to force the piston so hard with the C-clamp.