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so I have had these for 18 months ,first 12 months fine then the squeeling started ,bleed,scrub discs new pads etc fine for 3 rides then started again, only when hot but once started continue for the rest of the ride.Bought new discs new pads fitted same again , thought it was a bad batch of sintered superstar pads Swop'd them to another bike and still problems (grrr)Tried tying levers back and checking for leaks but nothing also if bike left for a week (horizontal)levers soften and air is found in the master cylinders can only think either air is getting in at master or when callipers hot fluid leaking on pads,if you have read this far cheers ,is it worth sending them back to merlin ? whats the warranty period ? anyone fixed this with some magical 'jiggery pokery'
Go back to the same brand of pads that you used for the first twelve months, I assume they would have been Shimano resin, would also check rotor/caliper bolts are tight.
Hard pads like sintered are generally noisier than soft resin.
Mine did this after two years. Seals in calliper had gone on one and in lever on the other. I got so fed up of bleeding after every ride that I just got some new brakes in the end. Shimano brakes are cheap and don't last forever.
When mine did this it was the olives at the caliper/hose junction that were weeping fluid slowly, new olives and a bleed sorted it..
IME this issue is one of rotors & pads only - stick with what works.
(My shimano brakes going fine after 8 years!)
Further to Als comments, if pads where contaminated with mineral oil you would be suffering from considerable power loss and there's no mention of that in your post, contamination is unlikely imo.
thanks for reply's ,pads, bought superstar for years generally fine swopped discs for new including rotor bolts suspect the squeel is to do with pad/calliper/piston interface. Have bled them enough ,even took them off the bike to get as full a vertical bleed as possible but of late not been able to get the softish feel from the levers.Will ring merlin and see what they say cheers all .
Are they just noisy? Or is there a loss of power too.
If it's just noise then stop bleeding them.
Just a thought... some Shimano rotors are resin only, worth checking, don't know how much this would affect things but they may not play nice with sintered pads, strange everything started out fine.