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When I press the brake it sound air and go down little

Tiny
MAFI DARE MICHAEL
  • MEMBER
  • 2007 LEXUS GX 470
  • 4.5L
  • V8
  • 4WD
  • AUTOMATIC
  • 55,265 MILES
When I start my car and press the brake it sound air and go down little bit, even on a motion when you press it down it sound air before catching.
Thursday, July 18th, 2019 AT 6:16 AM

2 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Michael,

More than likely this is the brake booster. Do the brakes operate normally? If you have the engine off and you press the brakes, you will probably get 1-3 presses of the pedal before the vacuum is gone and the pedal gets hard. If this is the same noise you are hearing and the brakes are working then I suspect this is a normal condition.
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Friday, July 19th, 2019 AT 1:05 PM
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Hello and welcome to 2carpros. Can you upload a video of the sound when you press on the brakes? I am asking because the GX does not have a brake booster? It has an acuator which is hydraulic and electric controlled? Attaching image.
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Saturday, August 3rd, 2019 AT 10:47 PM

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