Hi there, 
 
       I have a couple off question about brakes because i seem to be struggling with my maguras (on the rear of my stock bike ). I do not trust them every time i try to make a bigger movie they seem to slip.   I tried 2 sets of pads ( probably gonna order some new ones ), two different sets of levers, bled them x number of times doesn't seem to work.  Seriously started to dabble with the idea of getting a rear disk, by the way have any of you tried to getting a mechanical rear disk ( like bb7 ) would be interested to here how that worked.  I know that some use hydraulic disk brakes on stock bikes and there very good but thats just general preference.  
       Any suggestions would be very helpful thank u   .