Trailer brake

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tanvics71
Posts: 3
Joined: Tue Apr 03, 2018 7:53 am

Trailer brake

Post by tanvics71 » Fri Mar 15, 2019 8:13 pm

I’m looking to add trailer braking to one of my Marshall’s as I have purchased a lowloader anyone know where I can get a dot 4 compatible trailer brake valve new or used ,
Or has anyone rigged to spool valve (my dad used to when I was young) but managed to dropbflow rate /pressure so they not so sharpe

Pete



DAL PZ
Posts: 47
Joined: Mon Apr 09, 2018 10:39 am

Re: Trailer brake

Post by DAL PZ » Fri Mar 15, 2019 11:14 pm

Rick Cobley is your man for this I believe he has made up a system to do this

diggerdeano
Senior Member
Posts: 294
Joined: Sat Mar 31, 2018 9:04 am
Great Britain

Re: Trailer brake

Post by diggerdeano » Sat Mar 16, 2019 8:49 am

ford and DB used the same set up but they use mineral brake fluid so they would require resealing with the right seals

Rick Cobley
Posts: 192
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Re: Trailer brake

Post by Rick Cobley » Sat Mar 16, 2019 9:12 am

diggerdeano wrote:
Sat Mar 16, 2019 8:49 am
ford and DB used the same set up but they use mineral brake fluid so they would require resealing with the right seals
What type of brake fluid is used in Marshall tractors?

Rick Cobley
Posts: 192
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Re: Trailer brake

Post by Rick Cobley » Sat Mar 16, 2019 9:13 am

A trailer brake valve off a Massey found its way onto my Leyland 285!

tanvics71
Posts: 3
Joined: Tue Apr 03, 2018 7:53 am

Re: Trailer brake

Post by tanvics71 » Sat Mar 16, 2019 2:30 pm

Marshall’s are dot 4 same as Leyland I can get one off a international but they use mineral old so no good a not sure if and where to get new seals for dot 4

APH463
Posts: 3
Joined: Sun Apr 01, 2018 5:07 pm
Great Britain

Re: Trailer brake

Post by APH463 » Sat Mar 16, 2019 3:24 pm

we used to run trailer brakes off the spool valve , you need the male fitting into the spool valve and female fitting for the trailer brake connection and if you can't reduce the pressure from the tractor end what you can do is to use a plate something like the little round plates that you knock out of a 240 volt electric box to get the wires in , and drill a small hole in the centre of the plate, about 2/3mm and put it inside the 2 fittings(in between) , this will work . Disc markers on a accord drill use the same system , all you are doing is reducing the oil flow to stop the ram seals blowing out. You may have to experiment with the size of the hole in the centre of the disc. We had at the time about 6 tractors on trailer work that had to use this . What I'm saying is that it has been done like this in the past but today is a ?. Phil

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