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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Brake lights not workingViews : 708 Replies : 22Users Viewing This Thread : |
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Sep 12th, 2019, 10:22 | #11 | |
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Alternatively, in general for checking brake lights, a carpentry type of clamp adjusted to press outwards helps. Fit it between the pedal and the driver's seat and expand it to press the pedal. . |
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Sep 12th, 2019, 13:55 | #12 | |
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I can't seem to remove the whole switch assembly from the cables. There are 2 connections, one is a small light coloured wire with a white plug and 2 contacts which pulls out easily. However there is a much thicker black cable running from the switch up behind the dash too which I can't seem to unplug from the brake switch at all - it seems to be almost moulded in. Any ideas?
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Sep 12th, 2019, 14:12 | #13 | |
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Looking at the diagram, fuse #4 is the brake light fuse, the two wires on the switch for the brake lights are yellow/brown and green/yellow. If those are the wires n the white plug, remove that plug and link them together - if the brake lights work every time then the brake light switch is definitely faulty.
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Sep 12th, 2019, 14:41 | #14 | |
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Sep 12th, 2019, 15:16 | #15 |
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As i said, if those wire colour codes match what is on the white plug you're able to remove easily, disconnect it and link the terminals to prove the switch.
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Sep 12th, 2019, 18:35 | #16 | |
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The switch you did find is only for cruise control. The thicker black cable is the vacuum line for the cruise control. The switch for the brake lights is 2 inch higher located. and 1 inch to the front. If your cruise control isn't working the brake light switch will be the faulty part! good luck, Kay |
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Sep 13th, 2019, 09:13 | #17 | |
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I'll have another look tonight, thanks for that. Most people won't have cruise I suppose so might not recognise it. I did have an inkling it might be a vacuum line so thanks for the advice. The cruise control was working fine BTW, just the lights.
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Sep 13th, 2019, 19:05 | #18 |
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Ok so I found the brake switch. Eventually.
I unplugged it and when I connected the two wires together the brake lights came on straight away and stayed on. Even if the ignition was off - is that ok?
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Sep 13th, 2019, 19:38 | #19 |
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That's right, the ignition doesn't have to be on for the brake lights to work. That proves the switch (or its adjustment) is faulty.
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Sep 14th, 2019, 19:40 | #20 |
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Next big question, how on earth do I get the old switch out??? Can’t see how it’s done.
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