hydraulic disk brakes

[deano69]

hi everyone i am a newbie to this site, i have a mint condition 5 yr old almost 6 yrs, viking targa dx alu mountain bike, it has been very good and never let me down other than the odd pucture since i bought i have added new wheels, hydraulic disk brakes, new shimano under handle bar rapid fire shifters to allow hydraulic levers to fit.
i clean it after every outing unless its pretty clean already which it rarely is as the woodland trails etc have lots of muddy puddles.
my son says your bike looks brand new still, i said yes because its loved looked after and cleaned and serviced regularly so i told him take note and follow my example on your own bike.....kids eyyy
i recently found though the rear brake had become over pressured probably due to keeping it indoors when heating on, it does work fine but rear pads just gripping disk slightly before lever applied i had to let a tad of fluid out to sort this but is there a way to stop this fluid expanding in the first place ?......
hydraulics are like marmite you either love em or hate em, i love their stopping power and they rarely need much maintenance

 

[Globalti]

Just push a screwdriver blade in between the pads and force them apart. It won't have been the heat; somebody must have squeezed the lever while the wheel was out.

Nice shrubbery by the way.

 

[PJ79LIZARD]

If it's the disc rubbing on the pads cause it's not central, undo the Allen key bolts holding the disc brake to the frame, apply the brake and tighten the bolts up. This should centre it. If it's cause the pistons have come out do what he said and use a flat edge screwdriver and carefully push the pistons back in. Them do what I said to centralise the brake caliper.