I noticed that aftermarket calipers do not have rubber covers over the tension springs on the caliper. quote]
The ones I bought at Pepe Boys did and they were CHEAP!
Joop- I'm pretty sure you will only need to bleed both sides of the front if working on either or both sides in the front. Same goes for the rear. The reservior has 2 seperate compartments that makes the front and rear independant from each other.