Dennis Posted August 5, 2012 Share Posted August 5, 2012 I can't seem to get the front brake limiting valve to work properly. Maybe, I don't have it plumbed correctly. I put in a new TW-1 valve in the dash and a new LQ-2 release valve which is connected to the two front brakes, however, when I flip the dash valve lever it does not disengage the front brakes. I know the dash valve works as it is putting air to the LQ-2 valve. When I step on the pedal valve the front brake chambers still move. I am using air from the air manifold to the dash valve and it then feeds out the dash valve to the release valve. Anybody know what I've done wrong?Dennis Quote Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/ Share on other sites More sharing options...
theakerstwo Posted August 5, 2012 Share Posted August 5, 2012 It never diables the front brakes but only limits the air pressure some for slippey roads. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/#findComment-132272 Share on other sites More sharing options...
Freightrain Posted August 6, 2012 Share Posted August 6, 2012 You'll have to drive it to see the difference. Or put a pressure guage on the line going to the chambers to see the pressure difference.Once I hooked mine back up, I made the mistake of trying it one day. Oops. Only do it in a safe place(if you are a single axle with no load). Man. it don't stop for nut'n!! Guess it works?? LOL!! Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/#findComment-132448 Share on other sites More sharing options...
Dennis Posted August 7, 2012 Author Share Posted August 7, 2012 Thanks for the info, guys. I thought maybe that was the reason the adjusters where still moving when I pressed on the pedal. I will make sure they are engaged unless it is raining. Quote Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/#findComment-132504 Share on other sites More sharing options...
skip Posted August 7, 2012 Share Posted August 7, 2012 As mentioned above, it doesnt engage the brakes, it allows air on the top of the diaphragm of the LQ2 so when you do apply the foot brake- and air fills the opposite side of the diaphragm, it wont travel as far, therefore limiting the amount of air going to the front brake boosters. Quote Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/#findComment-132570 Share on other sites More sharing options...
Dennis Posted August 9, 2012 Author Share Posted August 9, 2012 Okay, thanks again. I got it. "Engaged" was a wrong choice of words. I guess the only way to really test it out is when I get it back on the road. Air pressure to the front brakes will just be reduced with the two way dash valve flipped over to "slippery road" position. Quote Link to comment https://www.bigmacktrucks.com/topic/26634-b-model-front-brake-limiting-valve/#findComment-132835 Share on other sites More sharing options...
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