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Despite having my rear brake recently serviced by my lbs they are still seem to be losing pressure if left. I have to constantly pump the lever to get it to work.
Even when they work it's not brilliant.
The brakes are Shimano XT approx 4 years old.
Any suggestions on how I can remedy the problem
Cheers
Take the pads out, can you see any fluid weeping at the seals of the pistons.
Just checked couldn't see any fluid
What about the reservoir on the lever? I assume there's no oil weeping out or you'd see it, but take the cap off and see if the rubber seal/bladder is damaged or split. Make sure you rotate the lever horizontal before you take the cap off.
doubled checked bone dry
I'll try looking at the resevoir tomorrow. Can you get a new seal?
Don't know sorry. Probably, try the LBS you had it serviced at, (and it is damaged you can have a mild complain at the same time!)