Please Release Me
Chevy High Performance|March 2020
Mastering the basics of hydraulic clutch systems
Jeff Smith
Please Release Me

A fitting definition of a modern performance car might just be one that has superior control over every system. EFI offers outstanding digital mastery over fuel and spark and it could be said that hydraulics offer similar and more specific control over clutch actuation. You could think of it like this: back in the ’30s, vehicle control made a giant leap forward when hydraulic brakes made their appearance on production cars. But like EFI, hydraulic clutch release systems have been slow to catch on with enthusiasts. The systems appear simple on the surface, but executing these systems properly can be sometimes problematic. But there are suitable solutions.

This becomes important with today’s Pro Touring and LS engine retrofit schemes where expectations are that a properly built muscle car can integrate 21st-century components into ’60s sheet metal seamlessly and perform much like a brand-new Camaro or Corvette.

Manual transmissions are far from dead on the street, but late-model, overdrive six-speeds often demand a late-model hydraulic clutch release system as opposed to a mechanical system. This story will look at some of the basics for hydraulic clutch actuation. The system—similar to a car’s hydraulic braking system—uses a hydraulic master cylinder to create line pressure plumbed (usually) to an internal hydraulic release bearing (HRB) positioned on the transmission’s input shaft.

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