Air coming out of break pedal

Tiny
CHUCHO 69
  • MEMBER
  • 1999 NISSAN FRONTIER
  • 2.4L
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
Does anyone know why when I push the break pedal I hear air coming out from behind the pedal? I already replaced the break booster, master cylinder, booster check valve and check all hoses for leaks but I still have the same problem. Any suggestions?
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Saturday, September 10th, 2016 AT 6:18 AM

2 Replies

Tiny
CJ MEDEVAC
  • EXPERT
I'm guessing it is the brake booster!

On most power brake boosters there is an adjustment screw/ rod that has to be adjusted to the back of the master cylinder (did you do this?)(Instructions usually come with the booster, specific to the type vehicle)

And the one that "JUST CAN'T BE!" - You may have a Brand New defective booster - yep, it can happen with might near any part you put on your vehicle.

Let us know how it works out.

The Medic
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Saturday, September 10th, 2016 AT 9:56 PM
Tiny
RYAN
  • ADMIN
Yeah CJ is most likely correct. Some parts come dead on arrival straight from the factory. Nothing you can do but take it back out and exchange it for a new one.
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Monday, September 12th, 2016 AT 12:44 PM

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