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plumbing diagram for pbr 4 trailer brake (Read 3046 times)
v8 inter nut
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molong
plumbing diagram for pbr 4 trailer brake
31.03.2013 at 19:35:04
 
Anyone tell me where to put the air lines to this hand controler I think I have it right but not sure



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Buc
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Re: plumbing diagram for pbr 4 trailer brake
Reply #1 - 31.03.2013 at 20:08:25
 
V8,

Try and search the 4M as I remembers there was some diagrams posted some time back cos I be pinch'm fer my records. Tongue

Here be one link fer ya ta check out but I be sure there be othas. Wink

http://www.hcvc.com.au/forum/YaBB.pl?num=1287914367/2#2

Regards, Buc. Smiley
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Re: plumbing diagram for pbr 4 trailer brake
Reply #2 - 31.03.2013 at 20:30:43
 
V8, as buc says..

there have been a couple of threads 'bout this. but I cant' find 'em...

I think IHscout may have started one, ...........
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Re: plumbing diagram for pbr 4 trailer brake
Reply #3 - 31.03.2013 at 20:50:18
 
I can tell you where they go but you'll have to wait until I'm back at work to look at a valve.
The valve is marked pretty well anyway.
From memory, the air goes into the hole closest to the steering colomn, the emergency or constant trailer supply is the hole at the other end of the valve, directly under the tractor protection valve, the control line which is the blue line to the trailer is one of the middle ones, then you have an exhaust and the one from the treadle valve as well.

If you take a photo of the underside of the valve showing the markings I can tell you which air line goes where.
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v8 inter nut
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Re: plumbing diagram for pbr 4 trailer brake
Reply #4 - 31.03.2013 at 21:03:52
 
Thanks cam would it be okay if I could ring you tomorrow when I'm infront of it as I would like to get it sorted. Pm me your number if that is okay
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jimbo51
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Re: plumbing diagram for pbr 4 trailer brake
Reply #5 - 31.03.2013 at 22:44:38
 
This might be of some use.....







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Re: plumbing diagram for pbr 4 trailer brake
Reply #6 - 01.04.2013 at 09:24:34
 
Hi V8 Inter, you've probably got all the info you need with Jimbo's post, but the ither topic referred to by Hayseed n Buc is here http://www.hcvc.com.au/forum/YaBB.pl?num=1327918313/0
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Re: plumbing diagram for pbr 4 trailer brake
Reply #7 - 01.04.2013 at 13:45:23
 
So in this set up what releases the spring brakes? Is it the tpv end of the CA300? or do you need another valve? My Dodge has air over brakes and a full mechanical handbrake so it doesn't have air park brake valving.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #8 - 01.04.2013 at 13:53:59
 
Tiz a proportion n valve to trailer brakes
th@ iz mainly controlled from truck brake pedal
U can dial up how much the brakes on trailer work
(Subbies luvd these valves to wear out bosses trailer brakes n preserve his own truck brakes)
also dependin on the load ratio truck - trailer jist dial for abalanced brake n system
LOL
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Re: plumbing diagram for pbr 4 trailer brake
Reply #9 - 01.04.2013 at 14:30:57
 
If you are talking about spring brakes on the prime mover it would be a separate valve and circuit.

The CA300 pre-dates the introduction of spring brakes on trailers but I don't see any reason why it wouldn't work via the tractor protection valve with the appropriate spring brake control and relay valves on the trailer.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #10 - 01.04.2013 at 20:14:53
 
Thanks every one I think it's sorted I will hook it up to the trailer late this week and check it all out
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Re: plumbing diagram for pbr 4 trailer brake
Reply #11 - 01.04.2013 at 20:30:43
 
Looking at the ports mate,

From the steering Colomn out-

1st one from the air pak
2nd one the red air line to the trailer
3rd one the blue air line to the trailer
4th plumb it out through the firewall for the exhaust
5th one air supply

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Re: plumbing diagram for pbr 4 trailer brake
Reply #12 - 01.04.2013 at 20:52:29
 
The constant supply to the trailer (red line) will pull the maxis off but to use them as a park brake you will need a control valve to dump the air from the maxis. The other thing to be aware of is if you have a break in the control line you won't be aware of it, apart from getting no response from trailer brake.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #13 - 01.04.2013 at 21:41:47
 
Mammoth, on the CA300F flicking the tractor protection lever to EMERGENCY dumps the air from the trailer supply line while protecting the prime mover supply. This would cause the trailer spring brakes to apply via a trailer spring brake valve such as a Bendix SR2.

Caveat - I'm talking older technology so current rego requirements may differ.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #14 - 01.04.2013 at 23:22:25
 
As Jimbo says the ADR's have changed over the years, but the Tractor Protection valve has always controlled the air supply to the trailer weather it is a CA 300 or plumbed with a different tractor protection valve set up.

On old trailers with out maxi brakes the trailer relay valve is set up so that the brakes come on if there is no air supply. (they only stay on until the trailer runs out of air)

On newer trailers with maxi brakes, the maxis come on when there is no air supply and stay on.

It has always been a requirement to have break away system in place which is why they work that way.

On older prime movers the tractor protection valve works independantly of the park brake valve.

On newer ones the trailer brakes must come on when the park brake is applied, so they cut the air supply off to the tractor protection valve when the truck maxis are on. There is a bit of an exception to that with tip over axle trailers.

You don't actually need a tractor protection valve, but on newer trucks the air supply to the trailer still needs to be cut off when the park brake is applied to meet the adr's. On trucks with a mechanical park brake they use a soliniod hooked up to the park brake light to achieve this, but that won't concern your old Inter as it is before the current adr.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #15 - 02.04.2013 at 20:18:14
 
So, on modern trucks is there a function to stop you heading down the Cunningham Gap, in the wet, unawares with a broken control line to the trailer? Apart from jacknifing into a rock wall that is.
Real question as last week my blue suzie was fully broken inside the springy part - nothing untoward to look at, but only with the hand piece full on a walk around found the air blowing out. I had earlier locked the drives at a zebra crossing in the dry on what should have been an easy stop but wasn't.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #16 - 02.04.2013 at 20:23:31
 
Erm Mammoth, there is a function that alerts you to the blue control line being broken or blocked..................

The trailer brakes won't work, unles of course you pull ot the tractor protection valve, in which case they will come straight on, maybe a bit of tyre smokin' action, but far superior to jack knifing into a wall.

Do Volvo's actually have tractor protection valves? Been that long since I've been in one I forget. The european's have some funny idea's, though I suppose the seppo's do too, like not having front brakes.
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Re: plumbing diagram for pbr 4 trailer brake
Reply #17 - 02.04.2013 at 20:39:29
 
Drove a 3070 once, the air supply to the CA300 was supplied from the parking brake circuit of the truck. The  maxi button in the 3070 would also apply trailer parking brakes.

Paul
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Re: plumbing diagram for pbr 4 trailer brake
Reply #18 - 03.04.2013 at 21:30:00
 
I am talking 1970's Volvo. It has a protection valve but you can't "pull it' like the yank design. The park brake is a proportional valve to drive axle only (plus the trailer hand piece can be used in the same way to trailer axles but is limited pressure and relies on having a working control line).
Ifn air pressure of park brake disappears the maxis come on.
The function you mention (to alert break or blockage) - how does it work?
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Re: plumbing diagram for pbr 4 trailer brake
Reply #19 - 03.04.2013 at 22:41:26
 
Mammoth, not sure of what you mean by the function, but if you are referring to Paul's post, all the newer trucks are plumbed up so that when the park brake is applied it shuts off the air supply to the trailer emergency circuit and the trailer brakes come on. It is an ADR now that the trailer park brake must come on when the truck park brake is applied.

The "function" I was referring to isn't really a function at all, more of a mal-function, if the blue line is disconnected or blocked the brakes don't work.

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