In the master cylinder, which port gets sealed when the brake pedal is applied?
bypass port
A master cylinder has two small ports to the reservoir: a compensating (bypass) port and an intake (feed) port.
When the pedal is applied, the primary piston cup moves forward past the small bypass (compensating) port and seals it off.
Once that port is sealed, further piston travel builds hydraulic pressure and pushes fluid out to the brakes.
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