Two "diggers" crash in Scotland

Speedstar · May 25, 2016

Think it was a 13 ton digger+trailer and fastrac would put it on the limit.but even if not it will not bring them back, if the trailer had brake problem air brakes should have came on and if not plugged in then it is a can of worms

Yale · May 25, 2016

People have gone to prison for a lot less.

Speedstar · May 25, 2016

Had to work out why if it had total brake loss , why it did not stop,As if a air pipe goes bang & all the air is lost on a fastrac the brakes come on,Or the only other way would be if a brake disc broke & took the calipitor off braking a brake fluid hose, then it would have no brakes of any kind , will take some sorting out to what went wrong

Lincsman · May 25, 2016

Speedstar said:
Had to work out why if it had total brake loss , why it did not stop,As if a air pipe goes bang & all the air is lost on a fastrac the brakes come on,Or the only other way would be if a brake disc broke & took the calipitor off braking a brake fluid hose, then it would have no brakes of any kind , will take some sorting out to what went wrong

Handbrake would put trailer air brakes on full, if tractor system failed, if driver could think while panicking and if the trailer had air brakes.

Speedstar · May 25, 2016

Lincsman said:
Handbrake would put trailer air brakes on full, if tractor system failed, if driver could think while panicking and if the trailer had air brakes.

Hand brake on a fastrac, would never stop that if put on when it was moving & if the trailer was on oil brakes with no fail safe oil system on it, it would be a roller coaster out of control, I would go with a broken brake disc if I was a betting man,

Lincsman · May 25, 2016

Speedstar said:
Hand brake on a fastrac, would never stop that if put on when it was moving & if the trailer was on oil brakes with no fail safe oil system on it, it would be a roller coaster out of control, I would go with a broken brake disc if I was a betting man,

I was meaning the switch on the handbrake (that puts the warning light on) puts air-braked trailers on full and will lock all wheels solid.

Zebbedee · May 25, 2016

Can clearly see the air lines still attached to back of fastrac so would appear they were attached, really there is so many mechanical issues that could cause brake failure etc and so many other things that could have contributed to the tragedy we can only surmise and in view of the outcome we should really refrain from that train of thought. I feel for everyone involved especially the fastrac driver as if it has been suggested he was out of control on the hill? that would have been a terrifying experience that no-one should have to go through. Whole thing is so tragic lives taken away in an instant.

Speedstar · May 25, 2016

Lincsman said:
I was meaning the switch on the handbrake (that puts the warning light on) puts air-braked trailers on full and will lock all wheels solid.

But was the trailer on air ?

principal skinner · May 25, 2016

Lincsman said:
Yes, in an instant all wheels would be locked up providing shoes drums etc were in some sort of working order.

If you dump all of the air out of the trailer brakes its releases the actuators............... disconnecting the air lines will lock the wheels, ripping them off and dumping the air wont.

principal skinner · May 25, 2016

Speedstar said:
Think it was a 13 ton digger+trailer and fastrac would put it on the limit.but even if not it will not bring them back, if the trailer had brake problem air brakes should have came on and if not plugged in then it is a can of worms

13t machines often are pushing 15t, I know a fastrac, low loader, '13t' long carriage machine with blade and a couple of buckets on board is nigh on 30t gross

Hilly · May 25, 2016

Zetor said:
I don't think he's overweight
This could be something as simple as not plugging the air lines in which would cause trailer fail safe not to work, it's happened twice locally to me one I witnessed but these were hgv's not tractors.

I remember that, the truck belonged to the haulier at the bottom of my valley iirc.

Lincsman · May 25, 2016

principal skinner said:
If you dump all of the air out of the trailer brakes its releases the actuators............... disconnecting the air lines will lock the wheels, ripping them off and dumping the air wont.

Chopping a red or yellow air line on a moving tractor/trailer outfit will put the trailer brakes on full.. thats what the air tank is for.

principal skinner · May 25, 2016

Lincsman said:
Chopping a red or yellow air line on a moving tractor/trailer outfit will put the trailer brakes on full.. thats what the air tank is for.

And when the air tank is empty...............................

Lincsman · May 25, 2016

principal skinner said:
And when the air tank is empty...............................

Depends on how airtight the system is but will take over a week then start to roll away, hence you apply the handbrake when dropping a trailer off.

Speedstar · May 25, 2016

Lincsman said:
Depends on how airtight the system is but will take over a week then start to roll away, hence you apply the handbrake when dropping a trailer off.

Not on a agric trailer , empty tank brakes off, depends weather they were spring on or spring off ,

sawdust · May 25, 2016

principal skinner said:
And when the air tank is empty...............................

The brakes lock on,

the air holds the brakes off

principal skinner · May 25, 2016

Lincsman said:
Depends on how airtight the system is but will take over a week then start to roll away, hence you apply the handbrake when dropping a trailer off.

Yep, BUT a failure in the system and no air in the tank results in no trailer brakes, agreed? I'm not speculating on the cause of this accident bit it needs to be known that air brakes or any brakes for that matter are fail safe.

principal skinner · May 25, 2016

sawdust said:
The brakes lock on,
the air holds the brakes off

You sure about that? Drain the tank and watch what happens.

S J H · May 25, 2016

principal skinner said:
And when the air tank is empty...............................

Air holds the brakes off so when the pipes go, the brakes come on.

I don't like to comment on things like this, but if the brakes did come on, the trailer isn't going to stop instantly, it could have skidded.

sawdust · May 25, 2016

principal skinner said:
You sure about that? Drain the tank and watch what happens.

Any trailers only on air, I've had dealings with you have to wind the brakes off if you want to move it with no air.

Two "diggers" crash in Scotland

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