Jarrupoljin

Jarrupoljin is the brake pedal used in Finnish-language automotive terminology. The term derives from jarru, “brake,” and poljin, “pedal.” It is the driver’s foot-operated control that initiates braking by transmitting force to the vehicle’s braking system.

In a typical passenger car, the jarrupoljin is located in the driver’s footwell and mounted on a pivot bracket. It is connected to the braking system either through a mechanical linkage to the master cylinder or via sensors in electronic braking systems. Pressing the pedal translates force into hydraulic pressure that actuates the wheel brakes. Modern vehicles may use brake-by-wire or electronic control systems that modulate braking force based on pedal input and other sensors, but the pedal remains the primary human–machine interface for braking.

History and variants: Hydraulic braking became standard in most cars by the mid-20th century, with the jarrupoljin evolving from simple leverage to assemblies with improved pedal feel and safety features. Some designs employ dual-circuit or tandem master cylinders for safety, while others integrate with electronic parking brakes and stability systems.

Safety and maintenance: The pedal should move smoothly with consistent resistance. A spongy, sinking, or stiff pedal can indicate air in the hydraulic system, worn components, or fluid leaks and warrants inspection by a qualified technician. Regular checks of brake fluid level and pedal feel are common maintenance considerations.