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using hydraulics for brakes
Posted: Sun Feb 10, 2013 9:16 pm
by john.n
I have been looking for ways to operate the brakes on a trailer I have and have been wondering about uning a small hydraulic ram coupled to the tractor hydraulics. I think this would give brakes that are either on or off but would be usefull as a safety system as the hills round here are very steep.
any comments or thoughts welcome.
Regards,
John
Re: using hydraulics for brakes
Posted: Wed Feb 13, 2013 5:46 pm
by Chug-A-Lug
I mentioned this idea a while ago to a local Ag contractor I used to work for. They said it wasn't uncommon in the past. Probably not ideal, but it gives you an option should you need it...
Re: using hydraulics for brakes
Posted: Wed Feb 13, 2013 10:38 pm
by marcusgs
Hi.
I believe many years ago it was done like this, however you would need to be quite careful about how you use them!
Re: using hydraulics for brakes
Posted: Thu Feb 14, 2013 12:27 am
by john.n
the idea would be for an emergency brake. although is there a suitable way to tame the brakes if i use hydraulics?
would it be possible to over power the brakes if i used one of these with a suitable linkage?
http://www.ebay.co.uk/itm/Trailer-Brake ... 2579f7f5d3
was thinking one of these cylinders with a 1/4" hose?
Regards,
John
Re: using hydraulics for brakes
Posted: Thu Feb 14, 2013 10:40 am
by dexta roadless
I guess the force applied to the brake system will be enormous. 5000N at 100bar - 850 kg at 170bar.
What you need is a trailer brake valve.mekanicly operated. It will operate the brake sylinders according to the force on the brake pedal.
Re: using hydraulics for brakes
Posted: Thu Feb 14, 2013 8:01 pm
by john.n
im trying to avoid making it too specilised to one tractor. guess I could reduce the force with a linkage?
or does anyone know a way to reduce the hydraulic pressure?
thanks for the replys
Regards,
John
Re: using hydraulics for brakes
Posted: Fri Feb 15, 2013 9:12 pm
by ol'Blue
why not use a simple surge brake setup like this?
http://www.ebay.com/itm/Titan-Boat-Trai ... es&vxp=mtr
the forward pressure on this coupler provides brake fluid pressure to your hydraulic trailer brakes. when your tractor slows down,,so does your trailer. I have had many boat trailers set up this way.
Re: using hydraulics for brakes
Posted: Sun Feb 17, 2013 12:02 pm
by john.n
looks similar to over-run brakes exept they used brake cables insted of fluid.
wonder how much troubole it would be to make an over-run coupling
Regards,
John
Re: using hydraulics for brakes
Posted: Sat Feb 23, 2013 6:59 pm
by john.n
I have decided to set up a cable running between the 2 brakes and used a hydraulic brake cyclinder to push on the cable to pull both brakes on. should also balance the brakes.
any comments?
Regards,
John