These little rubber rings seem simple, but they create a seal. Specifically for the clutch, they seal hydraulic fluid within the slave cylinder – preventing leaks. They’re designed to be compressed, so they squish into place and fill any tiny gaps between mating surfaces. Think of it as part of the system that actually makes your clutch work. When you push down on the clutch pedal, it’s hydraulic pressure that disengages the engine from the transmission. The O – ring keeps that fluid right where it needs to be, so you get consistent clutch operation. It lives inside the slave cylinder, which is connected to your clutch fork. A failing O – ring will almost always cause a leak, and that leads to a spongy or soft clutch pedal. You’ll notice if the pedal starts feeling different – maybe it goes to the floor, or you have to pump it a few times to get the car into gear. If the leak gets bad enough, you could completely lose clutch function. They’re inexpensive to replace, especially compared to the cost of repairing damage caused by a failing clutch. Fixparts Online has a good selection of these, and it's generally smart to replace these O – rings whenever you're doing a full clutch kit job – preventative maintenance, you know? They’re a small part, but they act like a shield protecting a bigger, more expensive system. Safe driving starts here: O-Ring (MPN N90316802) has a 12-month warranty!

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