Why does my brake warning light come on at corners?

Post date: 2018-11-10 07:22:18

The brake warning light on my car comes on when I go round left hand corners and I have no idea why. Difficulty : It's a 90s Toyota with ABS and OBD1. Yes, one.

My daily driver is a 1992 Toyota Carina II (T170) that's only just broken a hundred thousand miles. She's got ABS but (annoyingly) she's only got an OBD1 connection so there's very limited error messaging. She's mechanically bulletproof apart from this odd niggle.

For the last five thousand miles the brake warning light (not the abs light) has come on every time I go around a left hand corner, and goes off a few seconds after I straighten out. My experiments don't show any difference if I go faster or slower (so, lateral force); if I'm braking or accelerating; or how sharp the corner is. I've also checked in an empty carpark and the ABS still triggers.

My tame garage mechanics (sadly all under 40 and used to computer controlled everything) have taken a look and claim that there are no stored errors and they couldn't provoke an error off the ground. Discs (rotors) and pads are all good. They've done some basic checks and say the sensors are reading right, but I don't know if they rigged it to an oscilloscope. They had a theory that some suspension joints I knew were dodgy might be causing weird readings from the back, but no luck.

So...

It's a long shot but does anyone have any ideas or routes of attack? I don't have an oscilloscope to test with.

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