I used the brake set up from Kyosho (sp2 or st-r). It uses springs and cones in place of the tubing. It also uses a 2.6mm bolt and nut for mounting the linkage instead the screw that came with the kit. Overall I think it's not only stronger than the stock set-up but much more reliable as well.

Plus I'm more familiar with it having owned Kyosho kits.