Main brake cylinder (dual-circuit) Fiat 126 2nd series/126P/126 BIS

Main brake cylinder (dual-circuit):

This product fits the following models:

• Fiat 126 2nd series
• Fiat 126 P
• Fiat 126 BIS

The Master Cylinder

Since the 1920s, motor vehicles have been equipped with hydraulic master cylinders. As in Germany, since 1967, by law, passenger cars and trucks must have two independent brake circuits, modern motor vehicles almost exclusively feature tandem master cylinders. The master cylinder transfers the pressure exerted by the driver on the brake pedal to the brake fluid in the brake lines of the two brake circuits. It converts mechanical pressure into hydraulic pressure and distributes it - usually simultaneously for both circuits. However, if one brake circuit fails, for example, due to a leak, the tandem master cylinder is designed to continue supplying pressure to the remaining intact circuit.

Without brakes, a vehicle does not function. Brake operations are a "natural part" of driving and are therefore not particularly noticed unless an unexpected event occurs:

• the brake pedal travel becomes longer
• one has to "pump" to achieve braking effect
• the braking effect - deceleration of the car - decreases

These symptoms should not be taken lightly - an immediate troubleshooting is advisable. One of the possible causes in this case could be the master cylinder - along with other components of the brake system.