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Re: A couple of q's on front discs and pads.Meg 3
More pistons in the caliper doesn't always equate to better braking - you've got to calculate the surface area of the brake pistons against the surface area of the pistons in the master cylinder. One down side of multi-piston calipers is that there twice as many pistons to either seize or leak.
Theoretically the larger the circumference of the disc the closer it gets to the grip area of the road. So in essence bicycle brakes which act on the rim are theoretical more efficient. In the bygone days when they raced 50cc motorcycles most of them used rim brakes. The downside being the braking mechanism is closer to the road with the inherent problems of surface water and floods.
Many high performance brake pads don't really become effective until they get hot or warm so braking first thing in a cold morning can be a hairy experience.
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Honda Civic 1.4l