Rick's Free Auto Repair Advice

Posts Tagged: brakes hiss

Troubleshooting the Hissing Sound When Pressing Brake Pedal

What causes a hissing sound when pressing the brake pedal? If you notice a hissing sound when pressing the brake pedal, and the sound comes from under the dash, the problem is usually a failing vacuum booster. The vacuum booster uses engine vacuum to increase braking power. The booster uses a rubber diaphragm and a push rod. The rod is connected on one side to your brake pedal and the other side pushes the master cylinder piston. How a vacuum brake booster works The vacuum brake booster consists of two … Read More


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