브레이크·클러치 실린더
Brake and clutch cylinders are the hydraulic components that turn pedal effort into the fluid pressure used to operate the brakes or the clutch. A master cylinder generates the pressure, and a slave cylinder uses that pressure to act on the clutch release mechanism. They are central to how a driver controls a commercial vehicle smoothly and safely.
Pressing the pedal pushes a piston inside the master cylinder, which pressurises the hydraulic fluid. That pressure travels through the lines to the brake calipers or to the clutch slave cylinder, where it pushes another piston to apply the brakes or release the clutch. The hydraulic design multiplies a small pedal force into the larger force needed to control a heavy vehicle, and the system stays sealed so the fluid does not escape.
Cylinders fail when the internal seals or the cylinder bore wear, corrode, or get damaged by contaminated fluid, which leads to leaks and lost pressure. Common signs include a sinking or spongy pedal, reduced braking, difficulty shifting gears, visible fluid leaks, and a dropping fluid level. Because some vehicles share one fluid reservoir between the clutch and brake systems, a leak on one side can lower the fluid for the other. These are safety related faults and should be inspected without delay.
The correct cylinder depends on the vehicle model, the system it serves (brake or clutch), and the bore size and mounting. Confirm the part against the vehicle specification before fitting.
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What is the difference between a master cylinder and a slave cylinder?
The master cylinder converts pedal effort into hydraulic pressure. The slave cylinder receives that pressure and uses it to act on the clutch release mechanism. They work as a pair in a hydraulic clutch system.
What are the signs of a failing master cylinder?
A sinking or spongy pedal, reduced braking, a brake warning light, or visible fluid leaks. Because this affects stopping ability, it should be checked by a qualified technician without delay.
Why does my brake fluid level keep dropping?
A persistent drop usually points to a leak. On vehicles that share one reservoir between the clutch and brake systems, a leak on the clutch side can lower the brake fluid level too. Topping up without fixing the leak is not a solution.
What causes a clutch that is hard to disengage?
Difficulty shifting or a clutch pedal that does not reset can come from a leak or worn seals in the clutch master or slave cylinder, which drops the hydraulic pressure. A mechanic can pinpoint which cylinder is at fault.
Can a cylinder be repaired instead of replaced?
In some cases seals can be serviced, but a worn or corroded bore usually means the cylinder is replaced. A technician should assess which is appropriate for the specific part and vehicle.