residual check valves

[red cuda]

recently purchased a brake booster/ master cylinder set up. at this point before I install, would it be a good idea to buy a 10 and 2 pound residual valve to add to this set up? I have already installed disc brakes on the front. here is what im looking at on ebay. thanks



http://www.ebay.com/itm/10-2-lbs-Re...ord-/191588236519?hash=item2c9b8c7ce7&vxp=mtr

 

[67Dart273]

A drum brake master normally has residual valves in the master

Disc brakes don't need 'em

Some guys on here claim (I don't know) that wheel cylinder cup design eliminates the need even for drum brakes