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When turn on key after sitting overnight, brake.

Tiny
JCONE
  • MEMBER
  • 1999 LEXUS GS 400
  • 155 MILES
When turn on key after sitting overnight, brake booster makes squeaking sound as it pumps up. This lasts only seconds. Seems to be increasing in frequency. Is this serious? What is cause? Solution?
Thanks
Monday, March 11th, 2013 AT 5:08 PM

3 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Its difficult to hear what you hear from here, but it does seem to be unusual. Perhaps the booster will require replacement, I am not sure, but it might be a possibility.
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Monday, March 11th, 2013 AT 6:07 PM
Tiny
JCONE
  • MEMBER
  • 2 POSTS
On another site it was suggested that the vac line from the booster might be leaking, or its fitting might. It also suggested I move the line around with sound occurring to see if this could be confirmed. ANy thoughts about this?
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Monday, March 11th, 2013 AT 7:06 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
It may just be a dry dust seal, is the noise constant or only when the pedal is pressed?
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Tuesday, March 12th, 2013 AT 11:43 PM

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