Brake pedal depresed and hissing sound

1998 PLYMOUTH VOYAGER
200,000 MILES • 3.3L • 6 CYL • 2WD • AUTOMATIC
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JOSHUAFENDER755
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  • 34 POSTS
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
Aug 4, 2014 at 10:57 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
When you experience the problem, is the brake pedal harder to push?
Aug 4, 2014 at 7:41 PM
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JOSHUAFENDER755
  • MEMBER
  • 34 POSTS
No the brake pedal is not harder
Aug 4, 2014 at 8:08 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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.
Aug 5, 2014 at 6:33 PM
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