The Musashi is a great bike, but its braking system leaves something to be desired. There are two reasons for this - Tektro 725, side-pull front brake and Avid FR5 brake handles. Side pull caliper brakes have less mechanical advantage than the other types of caliper brakes. And, Avid FR5, long-pull, brake handles are designed to be used in conjunction with linear-pull and mechanical disc brakes, not caliper brakes (See: http://www.sram.com/avid/products/fr-5-lever). This combination will hardly slow the bike down when just the front brake is applied at speed. I replaced the Avid handles with black, Shimano BL-R550, short-pull handles designed for use with caliper brakes (See: http://www.shimano.com/publish/content/global_cycle/en/au/index/products/road/fl at_handlebar/product.-code-BL-R550.-type-%7Cbl_road%7Csl_road%7C.html). The Shimano handles have a greater mechanical advantage, resulting in approximately 60% more cable tension than the Avid handles can provide. Took a test ride this afternoon. Nice improvement in front brake stopping power. The Tektro R538 rear brake will now lock up the rear wheel when the brake handle is squeezed hard, whereas before it would not. The handles cost $19.36 plus $4.45 shipping at Niagara Cycle Works, through Amazon. Well worth the money.

Quote from FlyingLaZBoy on Jan 28^th, 2014, 9:04am:

 
I've put my rear caliper brake-equipped Baron on the ground with a locked wheel in an emergency stopping situation on a corner. But, I've never done the same with the disk brake on its front wheel, although it's capable of locking the wheel up. I have to really squeeze the Musashi's new short-pull rear brake handle hard to lock up the wheel. I'm hoping I can modulate the brake in emergency situations, and prevent a lock up. If not, I'll switch back to a long-pull handle.

Quote from rcko on Jan 28^th, 2014, 8:03pm:

 
 
Before I reinstalled the stock 105 caliper brake, I had a BB7 mechanical disk brake on the rear of my Baron. I could modulate it in a normal stop, but it always locked up the wheel in emergency situations with not a great amount of force on the brake handle (The bike would start to go down, but would recover when I quickly released the brake handle).

So spent time tearing down the bacchetta brake calipers.  Cleaned them out, then lube and reassemble them making sure to ck for sticktion on every moving part.  Lube and reinstalled again ckng for any sticktion. replaced the stock kool stop salmon pads with black ones.  Also re did the brake cable routing to avoid small radius bends. Re adjusted the caliper making sure the contact pts were simultaneous and balanced the grip on the avid levers.  The issue I thnk is the weak return spring.  But with proper install these brakes now seem to actuate cleanly and freely.
 
Must say it was worth it.  Much improved brake performance.  Modulation is still iffy but brake power is much improve.