Warming sound from dash on cold start

[Mrsparkle3000]

07 LX with 148k. This the third time this week that it happened, all on a cold start, after that it’ll start up with no sound or lights on the dash. The ABS, VSC TRAC, VSC OFF lights up for couple seconds and clears. I just had a refurbished brake booster replaced back in October. Also have transfer case, transmission flush, radiator flush don’t couple weeks ago. Am I counting my days on the brake booster crapping out on me again?!?

 

[Dirt J]

[ Am I counting my days on the brake booster crapping out on me again?!?

I think yes. Should have gone new.

Have you counted how long the booster runs at key on, per the procedure?

 

[Mrsparkle3000]

I think yes. Should have gone new.

Have you counted how long the booster runs at key on, per the procedure?

On a cold start the booster would run around 5 seconds but no noise on the ON position

 

[Dirt J]

Give this a try and see what the results are.

"Periodically test booster motor run time. Do this by pumping brake pedal 40 times with IG key off or key out of IG. Than check level in brake master fluid reservoir. Which should be at or near max line but not over. Than turn IG key to ON, and time booster motor run time. 40 seconds is max. 28 second is a very health system (new or newer). 40 seconds is limit, but may indicate some weakness. i.e: low voltage/amp from battery, it likes about 12.5Volts, weak seals, bad fluid, air in fluid, etc. Over 40 second, service is necessary."

From this longer write-up here. This procedure is also embossed on the brake fluid reservoir.