Jayira Posted January 3, 2013 Share Posted January 3, 2013 Lost rear brake light on MR690S can't seem to figure this out. All the other lights work fine just no brake lights. Please help. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted January 3, 2013 Share Posted January 3, 2013 do the lights come on with the johnny bar? if not look at the brake switch Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
Jayira Posted January 3, 2013 Author Share Posted January 3, 2013 Not sure what a Johnny bar is? Shouldn't the brake switch have power to it? I don't have power at the switch. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted January 3, 2013 Share Posted January 3, 2013 aka trolly handle, depends where your from, the switch is plumbed into the brake treadle valve should be near it some where close under the truck it should look something like this 1 Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
thomastractorsvc Posted January 3, 2013 Share Posted January 3, 2013 A hand valve (Trolly Brake, Johnson Brake or Johnny Bar) is fitted on the steering column or the instrument panel so the driver can apply the trailer service brakes independent of the towing vehicle’s brakes. When the hand valve and brake pedal are used at the same time, the trailer will receive the higher pressure. Using the brake pedal or hand valve sends air pressure through the trailer service line. This will activate the brake lights also, that is why I asked if the lights come on with johnny bar applied, if it does then you have to track down that issue if it does not come on then it is probably the switch or connection. Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
Pawel Posted January 3, 2013 Share Posted January 3, 2013 And don't forget to check the bulbs - my uncle once started to check the brake switch in his car, just to se hours later, that all THREE bulbs were burned out! Good luck with the repair, and have a nice dayPaweł Quote Link to comment Share on other sites More sharing options...
Jayira Posted January 3, 2013 Author Share Posted January 3, 2013 Thanks for the help. I now have brake lights again Quote Link to comment Share on other sites More sharing options...
rsb502 Posted January 3, 2013 Share Posted January 3, 2013 Yeah bulbs first, then brake light switch but if there is no power at the brake light switch its a fuse/ circuit breaker or relay and yes there is a fuse or circuit breaker for the brake lights on your truck somewhere. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
farmer52 Posted January 4, 2013 Share Posted January 4, 2013 Thanks for the help. I now have brake lights againWhat was the problem? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
RowdyRebel Posted January 4, 2013 Share Posted January 4, 2013 What was the problem?Obviously they had the day off for the holiday....but they are back to work now. 2 Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment Share on other sites More sharing options...
hatcity Posted January 4, 2013 Share Posted January 4, 2013 Obviously they had the day off for the holiday....but they are back to work now. Friggen union lites! 1 Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
yellarmodtippa Posted January 8, 2013 Share Posted January 8, 2013 hi guys my r model has no brake lights at all. all the other lights work. ive got power under the dash at the air valve but not outside under the cab at the switch. what are your thoughts Quote Link to comment Share on other sites More sharing options...
bigmack73 Posted January 31, 2013 Share Posted January 31, 2013 Whats that piece called where all the wires hookup on the back of the tractor. Its screwed on to the chasis well mine broke and now i have no brake lights. Everything is still wired but needs to be grounded. Hope that makes sense o and its a r model tractor Quote Link to comment Share on other sites More sharing options...
bmoeller Posted February 2, 2013 Share Posted February 2, 2013 When both brake lights are out at the same time, i usually check the ground first. More often than not, it is a bad ground. Quote Link to comment Share on other sites More sharing options...
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