Can someone help? One of my Marta brake levers doesn't spring back out all the way. It does enough to disengage the brake, but then only very slowly gets all the way back out. I've cleaned the calliper, see no problems with the pistons moving all the way back in, and I've refilled the reservoir (made no difference).

Is there an internal spring that might have got weak, or dirty? If so how do I get to it to clean things up?

Thanks!

Inside the lever will be a piston with two seals on it, pushed back by a spring. Haven't taken a Magura part for years, but i'd hazard a guess that you have to remove the lever blade pivot(usually a nut and bolt, or pin held by a grub screw), unscrew the pushrod from the lever blade, and the piston will be held in by a circlip.Usually a good clean of seals and bore, inspection for damage, followed by a smear of silicone lube on the seals will be all that's needed to get it moving again.