Pickup towing a trailer towing a chipper????

[b101uk]

I beg to differ sir!

 

I have heard of a fair few dealers who are having to replace tractor brakes of big new tractors under warranty due to early failure. This early failure is usually caused by insufficient trailer brakes. In a recent test, it was found that only about 1 in 4 of properly specced trailers were actually within the 25% braking efficiency required by law.

 

 

you can beg to differ all you like, I was quite specific in the type of trailer axel and brake type etc, you then have the rest of the farmer etc running trailers doing 40kph & 50kph+ with oil brakes on there trailers WHICH IS THE PROBLEM.

 

the fact remains that the tractors to which you refer are deficient in braking anyway and lack fail-safes, the >25% braking efficiency required by law only apply to tractors and trailer etc used beneath 20mph, if it is used above 20mph it is a minimum of >50% braking efficiency is required, but all the regular tractors with 40kph or 50kph road gears DON’T meet the 50% criteria so even with an air braked trailer that manages 50% braking force the brakes on the tractor still end up getting shot that way as they cannot cope with the speed and don’t do there part in matching the trailers braking force - deficient trailer brakes will cause excess ware on tractor brakes, like wise deficient tractor brakes and correctly working trailer brakes will cause excess ware on tractor brakes.

 

also if I recall from the test they were all oil braked trailers and if you read the txt within it even though they were “properly specced trailers” as far as the farmer etc was concerned in most cases they left the factory with the wrong brake pipes on contributing to significant brake lag or had brakes fitted that were on the small side so even when new brake parts were fitted and correctly adjusted and the correct brake pipes fitted by VOSA mechanics they were still not able to meet the 25% minimum efficiency!

[renewablejohn]

b101uk

 

I have a MB Trac 1000 which I use with a crane freuhaf skeleton container drawbar trailer which I have attached log carrier poles. (Air brakes and air suspension with own air tanks) Are you saying that the trailer will have a detrimental effect on the MB Trac as it will be braking more effectively than the MB Trac.

[b101uk]

b101uk

 

I have a MB Trac 1000 which I use with a crane freuhaf skeleton container drawbar trailer which I have attached log carrier poles. (Air brakes and air suspension with own air tanks) Are you saying that the trailer will have a detrimental effect on the MB Trac as it will be braking more effectively than the MB Trac.

 

In a word, no.

 

Your MB-Trac shares its brake system with mogs, same callipers/disks, you also have the added advantage of your brakes being much easer and cheaper to service being external and easer to visually check

 

I would imagine you notice very little difference in stopping distance between the unit on its own, the unit and trailer empty or fully loaded if everything is working correctly?

[renewablejohn]

b101uk

 

Thats a relief. I have never so far had a problem, With the air suspension the trailer really rides like a dream and stops really well. Wondered whether I could get away with towing another similar trailer like they do on the continent but the roads around me are a bit narrow.

[NI Tree]

In a word, no.

 

Your MB-Trac shares its brake system with mogs, same callipers/disks, you also have the added advantage of your brakes being much easer and cheaper to service being external and easer to visually check

 

I would imagine you notice very little difference in stopping distance between the unit on its own, the unit and trailer empty or fully loaded if everything is working correctly?

 

i would question this

 

change in momentium = (mass *intial velocity) -( MASS X FINAL VELOCITY) = FORCE X TIME

 

 

 

when you brake you can excert can only excert a maximum force due to the coefficient of friction is constat loaded or unloaded. therfore you force is the same.

 

therefore your it will take longer to stop as you have a larger mass when loaded.

 

the neuton second law would show this to if you do not increace you brakeing force which is very hard to do when loaded. so it would take longer

[b101uk]

i would question this

 

change in momentium = (mass *intial velocity) -( MASS X FINAL VELOCITY) = FORCE X TIME

 

 

 

when you brake you can excert can only excert a maximum force due to the coefficient of friction is constat loaded or unloaded. therfore you force is the same.

 

therefore your it will take longer to stop as you have a larger mass when loaded.

 

the neuton second law would show this to if you do not increace you brakeing force which is very hard to do when loaded. so it would take longer

 

 

correct if you don’t have an ALB/s valve.

 

BUT if you have ALB/s valve like most lorry & trailer air brake/air over systems then brake force ramps up with weight, hence maximum braking force is available threw the payload range.