The vectra does use other lights if a bulb has gone.
Brake light check vectra b.
Unless you know how to check your brake fluid levels yourself this will be one for the professionals so get yourself to a garage.
Start by making a visual check on the lights.
Check your brake fluid levels as soon as possible to avoid your brakes not working as they should.
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If brake light is defective the relevant tail light takes over the brake light function users manual.
Double check to see if a bulb has blown as it might not be too obvious.
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If only one light comes on the fault is probably a blown bulb since any failure in the brake light circuit would affect both bulbs.
I understand that it does t make sense but we really have checked all you say and we have also had a couple of the engineers i work with check it out they can t work it out either thanks for your help though.
Check this by taking out the bulb from the light that works and fitting it to the non working light.
So for example it can use a tail light as a brake light if one of the brake bulbs has gone.
Get a helper to operate the brake pedal with the ignition on.
If your vauxhall vectra b is also fitted with the abs system this light will also illuminate along with the abs light if there is an issue with the abs system see abs light on this page for more info.
If the red brake warning light comes on when you re driving you should pull over and stop as soon as it s safe to do so.