hi have just bought a 2nd hand giant xtc-4. i initially wanted a basic bike to commute but this one came up for 200 quid so i thought i might as well get in to it as a hobby, the problem is i have little inclination with these sort of things and there is a problem with the rear brake. it was very weak and had next to no fluid in the system. a couple of lads at work (unfortunately) persuaded me to let them try and bleed it through. there was some fluid in the system but they flushed it out of the back and told me to get some dot 4 fluid which i did, only we had no proper equipment and they made a right mess trying to tip the fluid in. i now realise the importance of doing this task properly having watched it done on youtube and i'm hoping they haven't done any permanent damage . i would like still like to attempt it myself and having looked in to it in more depth i realise there are kits available. there are a couple of giant bleeding kits online but im not sure if i need the roots version or the mph 3, because underneath the fluid reservoir it says g4 - will either or any of these kits fit my bike ? also should i be worried why the fluid needs replacing ? do i have a leak somewhere ? part of me feels like just getting a pro to do it, but how much would it cost and also i would rather learn to do it myself than always pay out to get it done. is it really a simple task ? any help would be greatly appreciated
thanks
thanks