Marin mount vision disc brakes.....
 

hi everyone and thanks for reding my thread. my problem is i bought this marin mt vison 3 weeks ago from a shop near me and even though its second hand (but absoloutly immaculate) after a day or 2 i started to notice this squeeking coming from my bike.gradually its got loader and loader,and i think ive narrowed it down to my rear disc brake. im suspecting its the 2 little blocks are too close to the disc and when im on the bike,the weight of me kicks of this squeeking. how do i adjust the breaks? to stop the squeeking? really annoying. thanks everyone!!