16955 brake switch fault (but probably not brake switch)

The warning light is back on - flashing glow plugs.
I've replaced both rear bulbs and checked fitting is correct and no issues with any corrosion on the bulb holders.
I've changed the fuse.
I've removed the brake light switch, cleaned it and re-fitted it.
Now brake lights are constantly on!
I swapped the switch with a spare one and still lights are on constantly!
Any suggestion, please?
 
steve@cromford said:
The warning light is back on - flashing glow plugs.
I've replaced both rear bulbs and checked fitting is correct and no issues with any corrosion on the bulb holders.
I've changed the fuse.
I've removed the brake light switch, cleaned it and re-fitted it.
Now brake lights are constantly on!
I swapped the switch with a spare one and still lights are on constantly!
Any suggestion, please?
Click to expand...
Scan?
Mac.
 
I,m not sure if this helps but when this happened to me the "springy" metal bits inside the bulb holder needed a gentle lift upwards to make good contact with the bulbs. 🤔
 
Well either the switch is damaged, not set or located correctly or wiring has a short. Fit a new OEM quality switch. Bulbs would not cause them to stay on.
 
steve@cromford said:
The warning light is back on - flashing glow plugs.
I've replaced both rear bulbs and checked fitting is correct and no issues with any corrosion on the bulb holders.
I've changed the fuse.
I've removed the brake light switch, cleaned it and re-fitted it.
Now brake lights are constantly on!
I swapped the switch with a spare one and still lights are on constantly!
Any suggestion, please?
Click to expand...
Did you do anything between this post, (today), and the October 21st post?
What brake light switch has been fitted since October?
Mac.
 
OEM 1J0 945 511 A ( Had a 8z number until 2014)
If any A2 owner finds a delay between brake and lights, first place to check; Brakelightswitch.Easy to replace.Use OEM here..
 

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I've got a few used factory ones available. They are cheap as chips on ebay, but the quality isn't there.
 
PlasticMac said:
Did you do anything between this post, (today), and the October 21st post?
What brake light switch has been fitted since October?
Mac.
Click to expand...
I tried a replacement Febi brake light switch but the issue persisted so I put the original switch back in.
I replaced both bulbs - one looked a bit iffy, filament wasnt broken but didn't look right. Bulbs seemed slightly loose too.
The warning light then went off and brake lights worked fine so I assumed it was issue with the bulbs.
 
steve@cromford said:
I tried a replacement Febi brake light switch but the issue persisted so I put the original switch back in.
I replaced both bulbs - one looked a bit iffy, filament wasnt broken but didn't look right. Bulbs seemed slightly loose too.
The warning light then went off and brake lights worked fine so I assumed it was issue with the bulbs.
Click to expand...
Its possible to misfit the brakebulbs, they`re inn, but do not respond right.Try to turn 180.They should be all the way down in the socket.
 
Howey said:
Have you fitted the correct bulbs?

What happens with switch unplugged?
Click to expand...
Yes, i double checked the bulbs. With switch unplugged nothing happens, lights off. As soon as I plug the switch in, the lights go on, even without pressing the pedal.
 
Has to be the switch, years ago they used to say the switches were one use only. Are you fitting the switch without touching the pedal?
 
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