brakeblock
nounUK /ˈbreɪkblɒk/
US /ˈbreɪkblɑːk/
A part that presses on a wheel to make it stop.
The mechanic replaced the worn brakeblock on the bicycle.
OTHER MEANINGS
2. A wooden or metal block used to keep a wagon or cart from rolling.
They wedged a brakeblock under the cart wheel on the hill.
3. Something that slows down or stops progress.
The new rules acted as a brakeblock on the project.
4. A device that holds a machine part firmly in place.
The brakeblock kept the lever from slipping.