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Brake pedal

Tiny
HUGGIEBEAR312
  • MEMBER
  • 2007 LINCOLN MKX
  • 3.5L
  • V6
  • 4WD
  • AUTOMATIC
  • 133,691 MILES
Brake pedal gets hard to press sometimes. I took it to have an oil change they check the brakes and now my brake pedal is hard to press. It does not happen all the time just sometimes. I have checked the brake fluid and it is fine. What would cause this?
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Wednesday, December 6th, 2017 AT 7:06 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Since it only happens at times, it may be vacuum related. The brake power assist booster may be losing vacuum or there may be a leak in the system. Watch this guide on how to find vacuum leaks. If there are no leaks, I would recommend testing the booster itself to see if it will hold vacuum.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
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Wednesday, December 6th, 2017 AT 7:56 PM
Tiny
HUGGIEBEAR312
  • MEMBER
  • 25 POSTS
Thank you. I am also hearing a hissing noise when I am pressing on the brake.
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Thursday, December 7th, 2017 AT 7:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Most likely it is the booster. Check to see if it will hold vacuum.
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Thursday, December 7th, 2017 AT 6:07 PM
Tiny
HUGGIEBEAR312
  • MEMBER
  • 25 POSTS
Okay, will check the booster and get back with you.
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Thursday, December 7th, 2017 AT 10:34 PM

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