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MG Car Repair/79 MGB - brake lights not working


i recently noticed my brake lights aren't working. Lights work,turn signals work, hazard lights work. Where is the brake pedal switch ? Seine told me its next to the clutch master cylinder. On my 79, their a black box in front of that cylinder. Is it underneath the black box ? Thanks for all your help.

Stop light switch
Stop light switch  
Hi Joe.

On a 79 B, under the hood there is a big black box covering the tops of the pedals.  The switch is screwed into the outside of the box.  It has two green wires going into it.

Sometimes the switch needs replacing, sometimes it merely needs adjusting.  The amount by which it is screwed in is the only adjustment.

This diagram may help you:

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Barrie Jones


MG Sports Cars from 1949 to 1980 - Including MGB, MGBGT V8, TF1500, TF, TD and modern Midgets. I also specialise in SU carburettors, Lucas wiring, suspension, steering & brakes.


I have owned my 1955 TF1500 since 1966. Technical specialist for the TD and TF with the MG Car Club T Register. Also owned 20 MGBs and currently own an MGBGT V8. Written 3 books on MGs and produced a DVD on how to strip and rebuild the TD/TF gearbox.

MG Car Club.

Barrie's Notes on the 1953-55 MG TF (author). /=====/ Barrie's Notes on the MGB (author). /=====/ Barrie's Notes on the MGB GT V8 (author). /=====/ The Essential Buyer's Guide to the MG TD, TF and TF1500. (author)

M Phil, C Eng, BSc (Eng).

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