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Brakes vacuum booster

Tiny
BLC542
  • MEMBER
  • 2001 ISUZU NPR
  • 4.1L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
When you turn on key there is a fluttering sound guess coming from the vacuum booster, and the brake pedal is very hard. The electric vacuum pump is making the fluttering sound it has some vacuum on it but the brakes a very hard to push any suggestions?
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Saturday, February 27th, 2021 AT 9:23 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Please remove the vacuum line from the booster and put your thumb over it and turn the key on to see if the vacuum pump is working. If it is the booster is bad and needs to be replaced. Let us know what happens and please upload pictures or videos of the problem.
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Sunday, February 28th, 2021 AT 7:28 PM

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