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What happens when the master cylinder goes out in a Pontiac sunfire?

Loss of Brake Pressure: The primary consequence of a failed master cylinder is the immediate loss of brake pressure. Without sufficient hydraulic pressure, the brake calipers and wheel cylinders cannot extend or retract the brake pads or shoes, respectively. This results in a significant reduction or complete loss of braking power.

No or Limited Braking: With a faulty master cylinder, applying pressure to the brake pedal may result in little to no braking action or a spongy, soft feel. The compromised hydraulic system fails to transmit the force from the pedal to the individual wheel brakes.

Brake Fluid Leak: A failing master cylinder can often develop leaks, allowing brake fluid to escape from the system. This causes a gradual drop in brake fluid level and can lead to complete brake failure if not addressed promptly.

Potential Collision: The loss of braking capability poses a significant safety hazard, increasing the risk of accidents and collisions. Without functional brakes, drivers may struggle to slow down or stop the vehicle effectively, leading to potential crashes and injuries.

It's important to note that a failed master cylinder requires immediate attention and should be repaired or replaced as soon as possible to ensure the safe operation of your Pontiac Sunfire.