Hi,
The material in the brake pads is all the same. Therefore, there should be no difference in stopping whether the pad is new or down to the last mill.
If your brakes are feeling spongy then you may have some air in the brake lines. Air, unlike brake fluid, compresses under pressure, and this gives the spongy feel to the brakes. Air in the brake lines compromises the required non-compressibility of the brake-fluid, and therefore it is possible the calipers won't exert themselves onto the disc with the same pressure as a non-compromised system, - ergo, the car doesn't seem to stop as well.
Air can get into the brake system by either a leak or by repeated brake use that results in the brakes getting so hot the fluid (near the calipers) boils.
seeyuzz
river
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