mackmb212 Posted May 8, 2012 Share Posted May 8, 2012 Are the brakes on my truck spring aplyied or air. The truck rolls freely with no air in the tanks. Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/ Share on other sites More sharing options...
daveigou Posted May 8, 2012 Share Posted May 8, 2012 Look to see if there is one air line or two to each chamber. I believe your truck may have old style "roto chambers" on it, which can be up-dated. If there is one line, no spring section, two lines, then you have spring appled parking brakes. Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118300 Share on other sites More sharing options...
mackmb212 Posted May 8, 2012 Author Share Posted May 8, 2012 Thanks Dave, I think there's only one line going to them dose that mean if the truck runs out of air it will roll away. Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118314 Share on other sites More sharing options...
daveigou Posted May 8, 2012 Share Posted May 8, 2012 If the truck does not have any kind of a hand parking brake, I find it hard to believe it doesn't have spring brakes on at least one axle.I remember seeing the rear brake chambers on your truck, and I think you're right they only have one line, but I don't remember what's on the front drive axle. Sometimes the chambers are mounted up on the frame rails, and there are long rods back to the wheel ends on the front drive, and they may have spring sections in them for parking. But they would have two lines on each chamber. Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118316 Share on other sites More sharing options...
Jamied625 Posted May 8, 2012 Share Posted May 8, 2012 if the truck rolls fine with no air in the tanks then it doesnt have spring brakes or maxis and if it runs out of air it would roll away if you dont have a hand brake Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118318 Share on other sites More sharing options...
mackmb212 Posted May 8, 2012 Author Share Posted May 8, 2012 Thanks for the input ill check it out tonight. Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118325 Share on other sites More sharing options...
mackmb212 Posted May 8, 2012 Author Share Posted May 8, 2012 I took a look at my truck and its a mess there are steel lines running all over the rear frame rails there are rubber lines coming from the brake chambers to what looks like a regulator of some sort mounted on the rears. There are 2 levers in the cab but I figured there both for the pto. Out of all the lines there's one coming from the tank to the front brakes all others are cut and the steel ones are caped. Rudy Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118360 Share on other sites More sharing options...
Jamied625 Posted May 8, 2012 Share Posted May 8, 2012 that thing on the top of the rear end is basically a spliter one line comes in two come out .correct? and as for the cut and caped lines that isnt right there should be two air tanks i think on that truck and there should be line coming out of the rear brake chambers that eventually make their way up to those air tanks. Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118361 Share on other sites More sharing options...
mackmb212 Posted May 9, 2012 Author Share Posted May 9, 2012 yeah thers a hard line coming from the bottom tank with a cap on the end after that the rest of the line gos to i guess a regulator on the driver side frame rail. do you by any chance have any extra b81 only parts like the radiator cap mine is missing i cant fine any on line and theres a srip off steel that bolts between the fender and hood. Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118399 Share on other sites More sharing options...
DodgeMan Posted May 9, 2012 Share Posted May 9, 2012 I might have a extra cap, or i might know a place to get one. They also fit L Models. I did see one at the truck show in macungie last year.A B81 in Lehigh Valley. Not to far away from me lol.Got any pics of your B81. Email me at mopartillidie@yahoo.com Quote Link to comment https://www.bigmacktrucks.com/topic/24997-63-b81-brakes/#findComment-118401 Share on other sites More sharing options...
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