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Cruise Control disengaging on 2008 LS460


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146k miles on this vehicle, a few months ago the cruise control started dis-engaging at speed when I went over a significant bump in the road.  This has progressed to where it shuts down on small bumps now.   I can re-start it and it works until next shutdown.

Possibly related, the Cruise Control status light (on the dashboard display) will flash on and off intermittently when at speed  (whether engaged or not I think).      Is this a common issue?   Saw another post that said it might be vacuum related?    Another post said that the brake light fluid might be low and that status indicator might be shutting down the cruise control?

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