I built me a little FL70 Freightliner to pull my gooseneck, but now I want a heavier trailer. FL70 was a box truck, I shortened it up and mounted a hauler bed with a 5th wheel. Truck has air ride and air brakes, but not for a trailer. I want a drop deck with air brakes, so I need to add the stuff to the truck for that. I've looked at a few diagrams, and I have the hand valve and red/yellow brake valves for the cab. I know I'll need a tractor protection valve. Have any of you done this before? Doesn't look easy, so any help and advise would be appreciated.
- Thread starter toolz
- Start date
willie in mn
Well-known Member
Toolz
Best bet would be to take it to your local friendly Frateshaker dealer, or any big truck shop. Not difficult, but too complicated to try to explain here. They have all the tubing, hoses, fittings etc on hand, & know how to do it right.
Brakes are too important to make mistakes installing.
Willie
diesel pilot-retired.
Best bet would be to take it to your local friendly Frateshaker dealer, or any big truck shop. Not difficult, but too complicated to try to explain here. They have all the tubing, hoses, fittings etc on hand, & know how to do it right.
Brakes are too important to make mistakes installing.
Willie
diesel pilot-retired.
One time a guy applied for a job working on trucks. Boss said I need some to work on air brake, do you know about them? Guy said yes. Boss said well, just explain to me how they work. Guy said sure, when you mash them they go shhhhh, an when you take you foot off they go tshhhh, tshhhh.
Haywood
Well-known Member
It needs a tractor protection valve installed and if you get a diagram from a single screw tractor and the diagram for the straight truck it should all make sense.
The tractor protection valve is what gives the trailer the air supply and protects the truck in the event of a break away. The hand valve assy is tied into the TP valve system.
The added supply valve for the trailer is also tied into tractor protection.
Sorry I can't be of more help but it has been many years since I changed one and I used the books from our IH Shop to get through it.
The tractor protection valve is what gives the trailer the air supply and protects the truck in the event of a break away. The hand valve assy is tied into the TP valve system.
The added supply valve for the trailer is also tied into tractor protection.
Sorry I can't be of more help but it has been many years since I changed one and I used the books from our IH Shop to get through it.
Is your FL70 new enough to have ABS brakes ? If you buy a newer air brake trailer it will come with ABS brakes.Youll need to wire them up as well as hook up air. The best advice I can give you is to check with a FL dealer or HD brake parts house. They should have diagrams of plumbing that would show required valves , and routing so your system will work properly. If its a Freightliner with ABS brakes its probably Meritor ABS but you need to check all that out. May be cheaper to buy a single axle tractor and sell your hauler. Or try to find a FL70 or similar truck plumbed /wired for air brakes and use it as a guide. Good luck.
I've been reading the Bendix air brake handbook online, it has diagrams and a lot of info. It looks like a bit of busy work plumbing everything up, but adding the trailer capability to my existing air brake system doesn't look real complicated. My truck is a '97, so no ABS, and I will probably end up with an older trailer- can't justify a newer pretty one for a hobby! Would like to find one with a dovetail and ramps, but can fab that if I have to. If anyone knows of a decent 45-50 footer for sale under $7500, I would be interested, and my 45' gooseneck is for sale. Thanks for the help.
I would not atempt to do it UNLESS I could go to the local truck salvage yard find a unit and get the parts. You mentinoned only the two big parts. You will find it is the little things that will drive you crazy and cost a arm and leg if purchased new seperately..
danofarming
Member
Find a donor truck with the equipment that you need, it will save lots of time, money and headaches.
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