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Brake pedal depresed and hissing sound

Tiny
JOSHUAFENDER755
  • MEMBER
  • 1998 PLYMOUTH VOYAGER
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I recently changed my brakes on my voyager and after about a month I noticed that I was loosing brake power and there is a hissing sound when I press down on my brakes. The brake fluid level is normal and the pads were installed correctly. Please help me to locate and fix the problem. Thank you
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Monday, August 4th, 2014 AT 10:57 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
When you experience the problem, is the brake pedal harder to push?
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Monday, August 4th, 2014 AT 7:41 PM
Tiny
JOSHUAFENDER755
  • MEMBER
  • 34 POSTS
No the brake pedal is not harder
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Monday, August 4th, 2014 AT 8:08 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I believe the power brake booster is bad. It is vacuum operated and mounted behind the master cylinder. Open the hood, start the car, and have a helper depress the brake. See if that is where the hissing is coming from. Also, check the vacuum hose between the booster and the engine intake.
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Tuesday, August 5th, 2014 AT 6:33 PM

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