Giant MPH Root Brakes - rear a bit soft

hairy_boy

Hi,

My rear break on my Terrago (Giant MPH Root Hydraulic discs) is feeling a little soft. Checked the pads and theres loads left on them.

Haven't done anything with these brakes since getting the bike but have the bleed kit and the instructions so thought I'd get some mineral fluid (is there more than one type of mineral fluid ?) and try bleeding/ filling the system to see if things improve ?

Anything I need to know before I start as a hydraulic disc virgin technician

hairy_boy

Got some mineral oil and bled/refilled the rear brake this afternoon.

Followed the instructions which came with my bike and things went very smoothly. Time will tell but ths appears to have done the trick !

Just need to find a decent online resource for purchasing the brake pads at a reduced cost

supersonic

Try discobrakes and superstar components for cheap pads.

Glad you did the bleed ok!

schlepcycling

+1 for Superstar components, bought 2 pairs of pads from them off ebay for £12 inc postage and they're been excellent.

aleeivel

I've got a (Giant MPH Root Hydraulic discs but no instructions :-(

I've spent the 2 hrs trying to find out how to do them!!! Any ideas as to where I can get them from ?

wayne669922

i have looked everywhere to find information on how to bleed giant root/mph brakes and found nothing.
so i gave up looking and decided to just have a go and with a few hours of messing around i finally found a decent solution to bleeding these brakes properly!
here goes:

step 1 .. loosen the lever and tilt the lever upwards so the bleed screw (on the top of the lever is level)

step 2 .. undo the torx screw on the top of the lever (bleed screw)

step 3.. on the caliper there is a bleed nipple with a rubber cap , remove rubber cap

step 4.. fill a syringe (20ml) with MINERAL OIL and connect a small length of tube/hose on the end of the syringe

step 5.. place a 7mm ring spanner on the bleed nipple and secure the tube/hose with the syringe attatched to the nipple.

step 6 .. place some tissue of kitchen towel or something to absorb fluid around the caliper incase any fluid is spilt (keep well away from the pads! (some people remove the pads and front wheel but this way is just quicker and easier , just be carefull!))

step 7.. push the syringe so the fluid enters the system and starts coming out of the lever bleed screw (place a bucket or something on handle bars to catch the fluid) you should see some bubbles of air escaping , when you stop seeing air escaping and the fluid is continuos tighten the bleed nipple with the 7mm spanner and stop applying pressure to the syringe and quickly put the torx screw back in to the lever and do up reasonably tight.

step 8.. wipe off any excess brake fluid and spray with water.

step 9.. reposition the lever again so this time the top of the reseviour is level with the ground and pump the lever untill the lever starts going harder and harder and then it should feel very sharp.

step 10 .. reposition the lever again so you can remove the torx screw on the lever and top up the lever with fluid (with the syringe)

repeat steps 9 and 10 , 2 or three times to make sure there is absolutly no air left in the system ..

congratulations your giant mph/ root brake is bled and ready to roll!!
sounds difficult but read carefully its really not that hard!
any questions or complaints!! please mention!!