jbud

Hi I figured it out. The red/white wire to the BRAKE warning light relay was off the wrong spade on the ignition switch. You may be able to see from the pic attached but the two red/white wires were coming off two different spades. Figured out which was the starter spade, connected the other and all works perfectly. Many thanks to this community. J

Snagger Do you know which relay terminal the ignition wire should be connected to. The light does come with the ignition switch but not in the starting position so I am starting with a wiring fault assumption. The brakes work really well with no softness etc. I only realized that this light existed when I replaced the fuse that is connected to the relay (and I've had the care for 8+ years!). Thanks J

Thanks for this. I'll read and digest. Despite being in the USA, the S3 is a RHD one I imported many years ago when I moved to this country from the UK.. My understanding is that on the late S3's the only switch in the circuit is the pressure differential switch with a dual brake system and that the travel and vacuum switches weren't installed....but I'll check again. Also there's no test switch, just a rectangular Brake light. I disconnected the pressure diff switch to open the circuit (light should have gone off) but it remained illuminated indicating a ground situation somewhere else in the circuit. I'll check to see if the other switches exist or not and if so whether they're faulty. The joys of S3 ownership....I love them! Thanks. J

Hi I've read a lot about the brake warning light but can't solve my problem. I have a 1983 Series 3. There is not test button, just the rectangular brake light in the center dashboard. Basically the light turns on when the ignition is turned on (first two clicks). It goes off when the engine is cranking (which is when I thought it was supposed to go on) and then remains on after engine has started, key goes back one click.. Perhaps the wrong ignition wire to the relay? Thoughts! Thanks J