I purchased a used 2014 norco storm 9.1 bike a couple months back and noticed the rear brake doesn't work nearly as good as the front, im talking like only 35% as good as the front and it has next to no stopping power especially when im going down a hill, front and rear brake levers feel stiff but the front feels a tad bit more stiff then the rear but not by much
Both brakes are the same, they are Shimano M395
Both are using resin pads with a good amount left, no contamination of any kind on the rotors and brake pads, i cleaned them all to make sure, rotors spin nice and true, no bends
I tried bleeding the rear brake 3 times without any success in helping the situation, the bleeding method is the shimano funnel on the lever with mineral oil in it, syringe with tube filled with mineral oil with absolutely no air bubbles, 50ml worth, I push it all through the system from the caliper and make sure there is no bubbles coming out of the funnel and still the rear brakes are complete rubbish
Is there something im missing here? I have absolutely no idea if the problem is the brake lever or the caliper.... there is no oil leaking anywhere from what I can tell
Could it be something like a bad piston seal?
Any suggestions would be greatly appreciated, thanks
I should also note that I tried taking the caliper off and took the pads out, i started pumping the brake to see what would happen and I started to notice a couple tiny bubbled creeping out from the side of one of the pistons, very little amount and seems to only happen once the pistons compressed passed their normal working position
Both brakes are the same, they are Shimano M395
Both are using resin pads with a good amount left, no contamination of any kind on the rotors and brake pads, i cleaned them all to make sure, rotors spin nice and true, no bends
I tried bleeding the rear brake 3 times without any success in helping the situation, the bleeding method is the shimano funnel on the lever with mineral oil in it, syringe with tube filled with mineral oil with absolutely no air bubbles, 50ml worth, I push it all through the system from the caliper and make sure there is no bubbles coming out of the funnel and still the rear brakes are complete rubbish
Is there something im missing here? I have absolutely no idea if the problem is the brake lever or the caliper.... there is no oil leaking anywhere from what I can tell
Could it be something like a bad piston seal?
Any suggestions would be greatly appreciated, thanks
I should also note that I tried taking the caliper off and took the pads out, i started pumping the brake to see what would happen and I started to notice a couple tiny bubbled creeping out from the side of one of the pistons, very little amount and seems to only happen once the pistons compressed passed their normal working position
not quite as good as the front but I would say 80% as good, im happy with that
