On Dec 4, 12:37*pm, crowizcom wrote:
i got giant fusion dx bike, such ashttp://www.giant-bicycles.com/nl-be/bikes/lifestyle/967/28195/zoom/?c...

its second hand but without many signs of use, ie like new!

however, brakes are very weak, and if i apply excessive force, there
comes metallic sound ..

Roller brakes can make a bit of noise, especially if they need to be
serviced. They stop just great in my experience, though you may need
to tweak the cable routing to get the smoothest pull.

I've used thick non-Shimano grease in roller brakes with no ill
effects.