My brake warning light (on a 1KZ) comes on intermittently too mainly after taking my foot off the gas when doing more than 2200rpm in gear. It stays on for a couple of seconds the disappears. It wont do it in neutral.
So got mine sorted. It was an issue with the vacuumed hoses that come off the front of the diesel pump. A blew an AC belt the other day and wiped out the hose off the fitting on the vacuumed pump. The vacuumed wasn't up to strength so the light would intermittently flick on
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