What may be the sign of a broken brake cable in a passenger car?

The question is about a sign of a broken brake line in a passenger car. The sign is little or no resistance of the brake pedal when you press it - answer B. An increase in braking force (A) and very high pedal resistance (C) point to something else.

The brakes in a passenger car work hydraulically: pressure on the pedal is transferred through the brake fluid in the lines to the caliper pistons, which press the pads against the discs. When a line breaks, the fluid leaks out, and instead of meeting resistance, the pedal sinks softly to the floor - sometimes after pumping it a few times it comes back up for a moment, but there is almost no braking. That is why the system is divided into two circuits: if one breaks, the other still brakes two wheels, more weakly and with a longer pedal travel, and a red brake warning light comes on on the dashboard. Very high pedal resistance is more likely a sign of a brake servo failure. When the pedal sinks without resistance, you take your foot off the accelerator, use engine braking by changing down, carefully use the parking brake and stop in a safe place - you do not drive any further, but call for help. The Road Traffic Act requires a vehicle to be maintained so that it does not endanger safety.

Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)