The 1951 Mark V Drophead is a milestone car . A device which shuts off the exhaust valves manually so that in the exhaust stroke , the burned gasses cannot escape through the exhaust valves . Instead they press against the head of the piston and causes the piston to slow down. When the intake valve opens, some of the exhaust escapes out the intake valve and gives a distinctive loud rapping noise. Jake brakes are used in large truck engines to assist in slowing the vehicle.
Many municipal bylaws prohibit the use of jake brakes because of the excessive noise.
The 1925-1948 models with required application are classic cars . Often a brass fitting placed inside one of the passages of a carburetor. See compensating jet and metering jet . On a bicycle , the pulley in a rear derailleur that stays closest to the freewheel cogs and guides the chain from cog to cog during a gear shift. A flexible or firm connector between two rods.