BucketTrucker688 Posted June 18, 2015 Share Posted June 18, 2015 When the brake pedal is applied at a normal sitting at a stop light pressure the brake lights do not come on but when you really put some a$$ into pushing the pedal they come on but come on weak..they are all led brake lights and when the parking brakes are applied the brake lamps come on normal brightness as they should. So what I'm getting at is where do I start looking? Truck is a 1991 Rd... Quote Link to comment https://www.bigmacktrucks.com/topic/40547-brake-lights-turn-on-only-with-hard-pedal-application/ Share on other sites More sharing options...
mrsmackpaul Posted June 18, 2015 Share Posted June 18, 2015 sounds like the switch on the treadle valve is blocked and the air isnt getting thru to the diaphragm so the switch cant work it doesn't sound electrical to me but pneumaticPaul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40547-brake-lights-turn-on-only-with-hard-pedal-application/#findComment-293818 Share on other sites More sharing options...
BucketTrucker688 Posted June 23, 2015 Author Share Posted June 23, 2015 Changed the stoplight switch on the firewall inside the engine compartment, all works fine now Quote Link to comment https://www.bigmacktrucks.com/topic/40547-brake-lights-turn-on-only-with-hard-pedal-application/#findComment-294340 Share on other sites More sharing options...
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