94 Defender Break Light Problems - Defender Source
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  #1  
Old June 5th, 2013, 09:38 PM
Defender_90
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Kevin Doonan
1999 RR HSE
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94 Defender Break Light Problems

Hello all,

Been awhile, but I am having an issues with my break lights. So all three lights do not activate when I hit the breaks.

I checked the bulbs and the fuses. I turned the lights on and all the lights come on, even the tail lights, but when I hit the break they will not activate the proper break brightness.

I cannot figure this out.... has anyone experiences this? And does anyone have any suggestions before I send the truck up to the shop.

Thanks in advance

Kevin
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  #2  
Old June 5th, 2013, 09:42 PM
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HeloBubba
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Chris Murphy
'89 127 (D130), '16 LR4
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Hi, Kevin-

There's a small, very difficult to get to plunger switch on the backside of the brake master cylinder next to the firewall. It's sort of fitted into a recess in the back of the brake booster/master cylinder assembly, is activated by the radial throw of the brake pedal lever, and has a couple of small wires connected via spade connectors to it.

They are a somewhat common failure item made of mostly plastic, and can also come out of adjustment sometimes.

You might want to look at that next if all fuses and bulbs are cool.

Good luck!
Murph
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  #3  
Old June 5th, 2013, 09:48 PM
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Chris Murphy
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This is it for reference or if a replacement is needed.

http://www.roverparts.com/Parts/PRC4297.cfm
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Chris Murphy
'89 D130SW
'86 D110 3-door
'89 D110SW
'16 LR4

Former:
'97 D90SW - SOLD SEP '14
'94 D90ST - SOLD MAY '13
D90s sold while assigned overseas. You're welcome America!
'06 Range Rover Sport Supercharged
'8X FankenRover D100
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  #4  
Old June 5th, 2013, 10:19 PM
Defender_90
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Kevin Doonan
1999 RR HSE
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hey chris,

Thanks for the heads up. I am going to do my best to check this out. Any advice on how to access this? Or what is the easiest way to check it out?

Thanks

KD
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  #5  
Old June 5th, 2013, 10:33 PM
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HeloBubba
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Chris Murphy
'89 127 (D130), '16 LR4
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Location: Fleming Island, FL
Posts: 774
Small hands?

In all seriousness, on one of my trucks, it just required threading it in an extra turn and it fixed the non-working lights. With the other, the switch eventually gave up the ghost and I replaced it. Actually not a bad spare part to have on hand.

It's a bit hard to see, and you'll be working by feel, but reaching behind the the booster/master cylinder 'box' mounted against the bulkhead, you'll be able to feel it, probably by identifying the spadeclip leads coming from it. It unthreads from the hole in which it's mounted, and (if still working) adjustment is as simple as turning it in the correct amount for the plunger to actuate properly with the brake pedal to activate the brake lights. Once you lay hands on it, it's actually pretty simple.

Murph
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Chris Murphy
'89 D130SW
'86 D110 3-door
'89 D110SW
'16 LR4

Former:
'97 D90SW - SOLD SEP '14
'94 D90ST - SOLD MAY '13
D90s sold while assigned overseas. You're welcome America!
'06 Range Rover Sport Supercharged
'8X FankenRover D100
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  #6  
Old June 6th, 2013, 09:55 AM
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Capt Milks
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Mike
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If that doesn't give you joy then I would check all of the grounds. Dim brake lights often are caused by bad grounds or poor contacts.
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  #7  
Old June 6th, 2013, 10:05 AM
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chris
D130, 2001+99 p38
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Bad ground......more than likely corroded bullet connectors in the rear wheel well or corroded harness increasing the resistance..you can cut the ground of the back light harness and install new ground wire
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