wheelcylinder
nounUK /ˈwiːlˌsɪlɪndə/
US /ˈwiːlˌsɪlɪndər/
A small part in a car's brakes that pushes the brake pads to stop the wheels.
The mechanic replaced the broken wheel cylinder so the brakes would work again.
OTHER MEANINGS
2. A cylinder attached to a wheel that converts hydraulic pressure into mechanical force.
The wheel cylinder expanded under pressure and pressed the shoes outward.
3. A component in drum brake systems located at the wheel.
Each rear wheel has its own wheel cylinder.
4. A hydraulic actuator used in vehicle braking assemblies.
Leaking fluid around the wheel cylinder can make braking unsafe.