Brake Pedal noise

Tamara Hock · May 9, 2018

My 2005 Expedition is new to me. It has 80k miles. I am the second owner.
The car repair place says the groaning noise I hear when I press on the brake pedal is probably the master cylinder. Should I believe him or get a second opinion?

Hamfisted · May 9, 2018

Take a mechanics stethoscope and listen for yourself. Have someone step on the brake pedal while you listen to the master cylinder and the brake booster area for this groaning noise. When I had it happen in the past it was the brake booster, not the master cylinder, making the noise.

https://www.amazon.com/Lisle-52500-Mechanics-Stethoscope/dp/B0002SQYSM

-Mike

1955moose · May 9, 2018

Do you hear the sound emanate from under the hood, or from the wheel area underneath?

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Tamara Hock · May 29, 2018

1955moose said:
Do you hear the sound emanate from under the hood, or from the wheel area underneath?

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Thanks for the response. The mechanc back pedalled the next day. Nothing wrong with the master cylinder.

1955moose · May 29, 2018

Tamara, I've never heard of a brake master cylinder making noise. Usually when they fail its a sinking pedal while at a stop, along with the check brake light on. Sounds like you might want to shop for a new mechanic! Noises are one of the toughest diagnostic on any car/truck. See if you can maybe have a different shop narrow down your noise. A groaning noise usually is the brake pads/ rotors, or something involving steering in combination with brakes. When do you hear this noise the loudest? Groaning is usually an overheated brake pads or rotor, or in some cases a loose friction material on brake pads causing movement when brakes are applied.

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Prince_Polaris · Jun 3, 2018

1955moose said:
Tamara, I've never heard of a brake master cylinder making noise. Usually when they fail its a sinking pedal while at a stop, along with the check brake light on. Sounds like you might want to shop for a new mechanic! Noises are one of the toughest diagnostic on any car/truck. See if you can maybe have a different shop narrow down your noise. A groaning noise usually is the brake pads/ rotors, or something involving steering in combination with brakes. When do you hear this noise the loudest? Groaning is usually an overheated brake pads or rotor, or in some cases a loose friction material on brake pads causing movement when brakes are applied.

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Oh lord, I was at mcdonalds this morning and while I was sitting there the pedal moved down a bit on its own, took me by surprise. I haven't had that happen before or since then, so hopefully it's nothing...

1955moose · Jun 3, 2018

Hope you ordered the salad! Check your master cylinder level, if below normal, pull wheels do an inspection. It's probably nothing though.

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Brake Pedal noise

Tamara Hock

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Tamara Hock

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