OK, am usually the one with the answers, but this has me stumped so far.

Had the mast cyl off, was to rebuild, but just ended up cleaning, replacing the rear seal and reassembling.

Also did both side brake pads and sensors on one side.

Now, when ignition is on, the brake lights are on. Continuously. Brake pedal is fine (bled brakes, no air that is noticeable, stiff pedal, brakes work fine, etc.) no wiring that I messed with to speak of.

Anyone else had this?

Maybe just coincidental that the brake light switch went bad at the same time? Lucas components snuck in un-noticed?

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

My brake light switch loosed up on me and the lights stayed on. …Just a thought

Thanks. That's about the only thing I could think of that would do this.

BTW, for others, I'm talking about the actual rear brake lights, NOT the "Brake" indicator light in the instrument panel.

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

TomJ,

Seems like it would have to be the switch or the mounting of the switch or a pinched wire. Look in the vicinty of the brake pedal under the dash.

When somethin like this happens, it is almost always caused by the previous repair you did.

P E H

The only thing that could have happened other than accidentally crunching the switch while messing about doing something else is to have changed the length of the pushrod while working on the master cylinder.

Probably just need to adjust the brake light switch.

The chief engineer from Lucas once told my father Lucas would never use alternators because they were too unreliable and not "self actuating" -- Pop designed the control system for a set of alternator stator winders for Chrysler and the guy from Lucas stopped in to take a look. This was early 70's, just before Lucas finallly started making alternators. I guess they were the folks that though English cars shouldn't have fuses, too.

Peter

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Well..., I found it and it was. But......

When I dropped the kick panel and D/C'd the cruise, the brake lights went out. They worked with the pedal, but when the cruise computer was re-conn'td, the lights came on again.

Took the unit apart and found a few traces that were jumped with solder. Fixed those, re-soldered the rest of the joints, re-assy'd to car and voila', all better. Cruise now works and so do the lights...., when they're SUPPOSED to!

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

TomJ,

Great detective work. I wonder how you doing the brake work caused the short to happen. Did you R&R the cruise control box when you did the R&R the brake master cylinder?


P E H

Not sure if the car wasn't that way when we got it. The only thing I did was drive it home (about 30 miles) and start cleaning it and changing fluids, so didn't notice if that was a problem to begin with or if something overheated the board (didn't appear to be) or unit was recently replaced by previous owner?

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol