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That Brake Light can be on for several reasons.

1) Low brake fluid
2) P-brake still slightly ON or bad switch
3) Tripped pressure-differential valve telling you that either the front or the rear brakes are not working

I'm not sure when Isuzu went to the 'Varying Intensity' brake warning light.

That was a system that had three levels of warning light intensity to tell you what was wrong - or offer a good hint anyway. Most people don't know that - but a good mechanic will know.

The Parking brake ON was always the brightest; the failed/detected front/rear proportional imbalance valve was dimmer and the low fluid was the dimmest light of all.

Make sure you know what you are seeing if you work on the system yourself. Try a skid test on some dirt to see if only the front or rear brakes are working if you're not sure.

Don't guess - and remember that that light is there for a reason other than filling space on the dashboard.
 

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Who's this 'tomm' guy? He doesn't seem to know what he's doing - I'd fire him.

Before you go hearing any more zebras, try that skid test I mentioned a few posts ago. That is good for a lot of gray areas to diagnose a brake problem.

Hello? Is this mic working?
 

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Heck fire! We got dirt in downtown LA! Gotta be easier than here for a dirt patch in your place! lol
 
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