brickers,

i have searched a good bit and have not been able to find an exploded view of the brake junction block swith on my 89 240 sedan. this is the switch that gives the "BRAKE FAILURE" light.

here is what I know about mine. it has a white nylon plug about 1/2 inch in diameter extending from the junction block. this plug has a connector in top to which the wiring harness plugs.

the threads are very fine and are a bear to work with.

when i removed the plug, i observed that it has a rubber washer about the size of a wedding ring on it. (no brake fluid leaks observed)

once the plug was removed, there is a spring, slightly larger that a pen spring and a brass pin about the size of a 22 shell. one end of the pin has a little nipple.

the spring and brass pin came out easily. it seems that the nipple of the brass pin fits into another nylon part. that part appears to be screwed into the same set of threads that held the nylon plug. it looks like it has a flat head screw slot in it. i assume it screws out but I have not gone that far. i was concerned that i might not get it out.

does anyone know what lies under the second plug (the one with the flat head screw slot)?

one source said that older models had to be reset but that newer models did not have to be reset. from what I see, there is no resetting necessary on my unit.

it seems that the design of the switch has changed over the years and the cheap manual i have did not keep up with it.

any help will be appreciated as i caused a "BRAKE FAILURE" during a recent brake bleeding and have been to chicken to go any further into the switch until i hear from someone who has been there.

thanks