How to inspect a brake pedal that hisses when depressed

When you take your car to the mechanic, they’ll likely start with a visual inspection of the brake system. Then, they’ll assess the brakes in action by taking a test drive.
The inspection will encompass the following components:
  • Pedal
  • Booster diaphragm
  • Booster vacuum
  • Master cylinder
  • Foam silencer
Once they have an idea of the problem, you’ll receive information detailing the projected repairs and repair costs.

How important is an inspection for a hissing brake pedal?

A brake pedal that hisses when you press it could indicate a minor problem, like a worn or missing foam silencer whose purpose is to eliminate noise. It could also indicate a major problem, like a fluid leak in the master cylinder that interferes with your ease of braking.
That said, it’s always better to err on the side of caution and take your car in for an inspection as soon as you hear a hissing noise when you step on the brakes.

How do I know if I need to have my brakes inspected?

If you’re not sure whether your brakes are hissing, check to see if the brakes are more difficult to press or generally feel heavier.
Brakes are one of your car’s main safety mechanisms. Never ignore any potential problems with them in the interest of keeping you and your passengers safe.

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