Have the exact same code flashing on my 91 S-10 Blazer. I've checked
the usual suspects: parking brake switch, pressure switch. Brakes work
fine AFAIK, so it's about time for a piece of black tape over the
Where are these parts located and what do they look like?
A photo would help if there is one on the web somewhere.
How does someone test them?
I assume these are next to the master cylinder, but thats just a
Today I drove on down to the local PicknPull, found an 89 S-10 Blazer
with the same brake control unit (ECM/ECU) as my 91, swapped the part
and the brake warning light isn't flashing that 6-1 code anymo's.
On your GMC it's probably located right next to your master cyl.
A black box 6" x 4' x1' with two sets of leads out of it
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