Speed Posted October 20, 2007 Share Posted October 20, 2007 Hi all; I'm trying to figure out the link up Mack used for my E model with hydraulic brakes and HydraVac to pull trailers with air brakes. I know it was set up to do this at one time,but most of the system is now gone. It appears there was some sort of control valve connected to the brake pedal linkage under the floorboards that operated air brakes,but I can't find any info on it. I might have a compressor located,and have air tanks,and some of the original plumbing,the air gauge and control on the steering column-what parts are missing are the big mystery. The reason this is kinda important to me is that I have 3 large trailers to move,2 are only going about 3 miles on a gravel road,which I can cover by loosening the slack adjusters,but one may need to be moved about 30 miles on I-80 and 2 lane highways so I'd like to have the trailer brakes functional enough to be legal. Garth,you might have this set up on your truck-if you do,could you get a few pics of it for me? I have some sort of apparatus on the firewall that looks to be related to an air system,but the lines are gone from it so I don't know what it does/did. I was also given a 40 foot 5th wheel RV,which I believe I can pull with my Mack no problem. Thanks in advance for any info you can send my way. Speed Quote "Remember-ANY Gun Control is Unconstitutional!"<!--sizeo:3--><span style="font-size:12pt;line-height:100%"><!--/sizeo--><i><b>MACK-E Model Registry # 36</b></i><!--sizec--></span><!--/sizec--><a href="http://www.nvabatetravel.com/"target="_blank">http://www.nvabatetravel.com/</a> Link to comment https://www.bigmacktrucks.com/topic/2988-air-for-trailer-brakes/ Share on other sites More sharing options...
Packer Posted October 22, 2007 Share Posted October 22, 2007 My converter, hydrolic to air, maybe behind the cab on the drivers side and low. - - - bottom of the frame rail low.Might also be the hydrovac system. Been too long since I looked at it to say.Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/2988-air-for-trailer-brakes/#findComment-14620 Share on other sites More sharing options...
Speed Posted October 24, 2007 Author Share Posted October 24, 2007 My converter, hydrolic to air, maybe behind the cab on the drivers side and low. - - - bottom of the frame rail low.Might also be the hydrovac system. Been too long since I looked at it to say.Packer Okay-on mine the brake pedal arm goes past the pivot point,and as I understand it there's some sort of an air "master cylinder" actuated by a pushrod off the brake pedal arm. The one you're describing sounds like what I'm talking about though. I wonder if that unit's still available somewhere... Speed Quote "Remember-ANY Gun Control is Unconstitutional!"<!--sizeo:3--><span style="font-size:12pt;line-height:100%"><!--/sizeo--><i><b>MACK-E Model Registry # 36</b></i><!--sizec--></span><!--/sizec--><a href="http://www.nvabatetravel.com/"target="_blank">http://www.nvabatetravel.com/</a> Link to comment https://www.bigmacktrucks.com/topic/2988-air-for-trailer-brakes/#findComment-14667 Share on other sites More sharing options...
Packer Posted October 24, 2007 Share Posted October 24, 2007 I'm headed to WY this week-end and will be looking at an 'E' model on the way back.I'll see if I can get a picture or two.My '48 'E' has the can on it, but not hooked up.Another 'E' I found may or may not have air on it.I'll just have to look and see.Let you know next week.Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/2988-air-for-trailer-brakes/#findComment-14685 Share on other sites More sharing options...
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