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The most frequently replaced part of the hydraulic system is the wheel cylinder - this is nothing to do with the quality of the original part but is a reflection of the environment in which it operates and the role that it fulfils.
With most modern braking systems, greater demand is placed on the front discs and calipers rather than on the rear braking system. Over a period of time this results in the natural deterioration of the seals and rubber boots, and consequently the wheel cylinder leaks.
