The clutch master cylinder will typically fail from it's internal seals.
The leak may or not be obvious, so if you are experiencing clutch hydraulic
problems and the clutch slave cylinder and clutch slave hose is not obviously
leaking, it's most likely the clutch master cylinder. Seal rebuild kits
are an economical alternative, but corroded and pitted bores will make any
rebuild fail. It is safer to buy a new or rebuild clutch master cylinder
and just replace your original unit. We recommend Mazda remanufactured
units over big auto parts chain stores for better quality.
With any of the clutch hydraulics, if your set (clutch master cylinder, clutch
flex hose, and the clutch slave cylinder) is still original from the factory,
it is highly recommended to replace them all at the same time if you can afford
it. It is common to end up replacing all of them once one fails, as you end
up replacing the weakest link in the chain and they all leak once you start
replacing each aging component.
Clutch slave cylinder Problems page
Clutch slave flex hose Problems page
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