Rear brake lights not working

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Lovejoy
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Rear brake lights not working

Post by Lovejoy »

Hi, please can someone help? I've just been checking all my lights for my vans mot tomorrow, one of the headlight bulbs was out, so will get one in the morning but my brake lights arnt working, ive checked that the wires on the back of the lights are on and they are. The rear lights work when the lights are on but dont get brighter when the brake pedal is pressed. The connectors on the brake switch are connected too. The fuse is ok too. Does anyone have an idea what i could check? Is it anything to do with front bulb being out? I swapped the front bulbs from side to side and its definately the bulb. Any help would be great.

Thanks Ste
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Marvelwear
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Re: Rear brake lights not working

Post by Marvelwear »

Try an extra earth on the neg side of the bulb?
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Samba63
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Re: Rear brake lights not working

Post by Samba63 »

Nothing to do with the front light being out.

Could be a defective brake light switch on the brake master cylinder.

Do the brake lights come on if you disconnect the wires from both sides of the brake light switch and touch them together? You need ignition on to see if they work this way. You're effectively testing the brake lights by bypassing the brake light switch.

If so, you'll probably need a new switch in the master cylinder. It's quite a common thing for them to fail.
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Lovejoy
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Re: Rear brake lights not working

Post by Lovejoy »

How do you know which is the negative side of the bulb? Sorry, im ok with mechanical stuff but not very good with electrics!

Also just tried bypassing the brake light switch, that was a great idea and thought it would be that but it wasnt. Thanks anyway

Ste
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Samba63
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Re: Rear brake lights not working

Post by Samba63 »

Do your bulbs have two lead pips on the bottom, and two filament wires in the bulb?

If so, the metal outer part of the bulb is negative, and one of the pips is for the brake light filament, the other pip is for the sidelight filament.

If the bulb is out of the vehicle, it doesn't really matter which way round it is tested as the filament only completes the circuit.

If both filaments light up when tested, it means the bulb is OK and your problem probably lies with the wire from the brake light switch to the rear of the vehicle.
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Lovejoy
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Re: Rear brake lights not working

Post by Lovejoy »

It was the brake light switch! Trying it on my own late last night wasnt a good idea, but this morning i had another look with the help of my dad stood at the back of the van and when i touched the wires together the lights worked. Thankyou for all your help :)

Ste
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Re: Rear brake lights not working

Post by Samba63 »

Pleased to see you've found out what the problem was Ste.

Glad to have been some help.

Trev
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Re: Rear brake lights not working

Post by Bellyjabie »

Thanks guys, this thread just helped me fix my brake lights!!! :)
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Re: Rear brake lights not working

Post by Paulbarra01 »

Hi all,
I'm after some help.
I have a 1965 splitty
My rear brake lights are not working, I have already bought a new brake light switch but they still are not working, when I took the 2 wires off the switch and attached them together the brake lights come on.
Has anybody got any suggestions as to what else this could be it's doing my head in!!
Thanks heaps
Paul

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Re: Rear brake lights not working

Post by vwJim »

Have you bled the circuit after fitting the new switch?
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BJ1
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Re: Rear brake lights not working

Post by BJ1 »

Could well be a brand new but dead brake light switch. Had a few of those recently.
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Re: Rear brake lights not working

Post by Paulbarra01 »

BJ1 wrote:Could well be a brand new but dead brake light switch. Had a few of those recently.
That's something that crossed my mind but was seeing if anyone had other thoughts
Thanks heaps

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Re: Rear brake lights not working

Post by Paulbarra01 »

vwJim wrote:
Thu Jul 06, 2017 10:58 am
Have you bled the circuit after fitting the new switch?
I have bled the brakes as they are new. Do you mean the master cylinder? Is that something you can do?

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Re: Rear brake lights not working

Post by jayvanman »

Take the switch out, Make a simple circuit, battery, wire, switch, bulb, wire, battery and check the switch, if that's possible?
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Re: Rear brake lights not working

Post by readyboy61 »

always buy two new switched because most the time 1 wont work, cheap crap
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