Is this a good trick?

[uclabiker06]

Read somewhere that putting a business card between the brake pad and the disk helps to get rid of drag.  I guess the space that the paper creates forces the piston back a bit. Basically you wedge the business card in then pull the brake lever.  True?

[battlecry]

If you want to reduce brake drag, get fully-floating buttons for your rotors.  You will like the noise too.   

[Rock Store]

I would inspect my rotors for minimum thickness & warpage,clean themof with a scotch brite pad & a high flash point brake cleaner, check that the master cylinder  is working properly and not sticking,next dismount the calipers remove the pads & check the retainer pins for pitting and wear,more important are the pistons & the caliper bore,if any pitting is evident theyll need replacement,most common sticking problems are usually by accumilated brake dust & grime ,make sure the seals are fine & clean pistons & bores out with the high flashpoint solvent or denatured alcohol,not the seal,just wipe it clean ,oil the inner piston & caliper bore with fresh brake fluid ,and reassembly.Bleed system as necessary till all air bubbles are gone.
As for an answer to your original question"No".
later...RS

[NorDog]

Read somewhere that putting a business card between the brake pad and the disk helps to get rid of drag.  I guess the space that the paper creates forces the piston back a bit. Basically you wedge the business card in then pull the brake lever.  True?

I don't know about that, but a playing card and a clothes pin can make your Schwinn sound like a motorcycle.   [moto]

[uclabiker06]

I actually just had my rotors floated more and cleaned w/ a scotch bright pad.  I also pushed the pistons back in and then put new pads.  I'll proceed to bleed and take it from there.