Function of 1K0721388S:
The clutch master cylinder refers to the part connected to the clutch pedal at one end and to the clutch booster via hose at the other end. It serves the purposes of collecting pedal travel information and causing the booster to disengage the clutch.
Symptoms of a broken clutch master cylinder:
The most obvious symptom of a broken clutch master cylinder (typically accompanied by oil leakage) is difficulty in engaging a gear after the clutch is depressed. In serious cases, attempts to engage a gear will be futile, because the failed pump will prevent partial or full disengagement of the clutch.
As a pure OE product, 1K0721388S is provided by Borsehung. It is quite competitive in price and abundant in supply, and backed by reassuring after services.
How often should 1K0721388S be replaced?
No definite service life has been specified for 1K0721388S. As a rule, replacement with an original is only necessary after the clutch master cylinder is broken, e.g. when depressing the clutch is not followed by a feeling of common resistance.