1999 Lexus Gs 400 Turn On Key After Sitting Overnight Brake Booster Makes

1999 LEXUS GS 400
155 MILES
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JCONE
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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
Mar 11, 2013 at 5:08 PM
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DOCHAGERTY
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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.
Mar 11, 2013 at 6:07 PM
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JCONE
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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?
Mar 11, 2013 at 7:06 PM
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MHPAUTOS
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  • 31,937 POSTS
  • ASE Certified Mechanic
It may just be a dry dust seal,is the noise constant or only when the pedal is pressed?
Mar 12, 2013 at 11:43 PM
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