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1995 Iveco Cargo 75E15 Air Brake problem; One air tank doesn't build any pressure
Topic Started: Jan 27 2013, 08:51 PM (12,970 Views)
ADAM.T
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Hi all,

I'm new here, will post a little introduction later.

I have a 1995 cargo 75E15 horse box, got it in the other day and it built up pressure and then released but when I went to pull away I noticed it had only built pressure in one of the tanks.

It releases the parking brake no problem and does drive but has no braking power what's so ever.

I checked the tanks, one does get pressure as you can release air out of it, but one only has very little pressure, if you drain this off it will then get this small amount of pressure back but nothing shows on the gauge.

It had no antifreeze for the air system at all so I have filled that now, but still have the problem.

What are the two chamber looking things by the air tanks? If I connect a pipe to the one closest to the front of the truck and press the brake pedal very little air is releases and quickly runs out. If I connect the pipe to the one nearer the rear and press the pedal there is high pressure and would take alot longer to run out.

At the front under the front grille, there is the 4 way distribution valve block where the brake pedal opperates from ( not sure on what is actually is, just thought that was a fairly good way to describe it). There are 4 large diameter pipes coming from it, pipe numbers 11 & 12 have no air if I disconnect them, but pipes 21 & 22 have air in them.

This is my first time looking at air brakes so don't really know much.
I am mechanically minded as have done engine conversions, and already had to do the starter on this truck.

Any advice is very much appreciated

Cheers
ADAM
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aidan
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Adam

No disrespect to you but no brakes and no system knowledge = time to call a professional mechanic.

Sorry that's not what yo want to hear, but in my opinion giving advice on a open forum that could be misinterpreted and result in a dangerous vehicle is not a good idea.

Others may feel differently of course !

Aidan
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ADAM.T
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Hi Aiden,

I understand your point, braking is particularly important at the end of the day!

However, how am I going to get the knowledge if i don't research and try. Obviously I know when I am beaten and when I have to hand over to a proffesional, but at the minute I do actually have brakes, just not to the same power, and the problem could be as simple as a blockage due to cold weather and no antifreeze, or a stuck valve, or a blocked air dryer etc..... I just like to have a look myself before I go and pay for something that I could sort myself.


Many Thanks,

Adam
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Troglodyte
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Was it ok when you first got it ? 21 and 22 should be your supply out of the foot brake valve to first and second priority so should not have any air to them until the foot brake is pressed , pipes 11 and12 on the other hand should both have air dependant of what is your tank which are supplied via the multi circuit protection vale which also numbered to which pipe coming out to where it goes 21 first priority brake 22 second priority brake 23 hand brake and 24 auxiliary eg seat , clutch etc , the hand brake should not release until there is sufficient air in the foot brake tanks to enable braking , but it does sound like your foot valve has been plumbed in incorrectly , hope this helps
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ADAM.T
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Many thanks for your reply :D

Makes sense on the foot brake valve with the air in the pipes.

It allows me to release the park brake with just the one tank up to pressure which I did think didn't seem correct.

I filled the other tank with my electric compressor the other day, managed to get it to 7 bar before the little compressor cut out. This gave my foot brake the correct feeling back and turned the brake warning light off..... However after dressing the pedal a few times that tank is back to 5 bar, warning light back on and it won't build the pressure. Still allows me to operate the park brake as normal though.

Has always lost its air over night since ownership, but until now always built air quickly in both tanks when started.

It also seems to be using the meth very quickly :-/

Cheers
Adam
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Troglodyte
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The parking brake pressure is not linked to your gauges in theory the parking brake air chamber should not charge until both foot brake gauges have around 7 bar but if the multi circuit protection valve is not working correctly ie not charging the system in order of priority then it may well fill the wrong tanks at the wrong time . I am a little confused as to the meths as far as I can remember it should have an air drier and not meths that has not been used for a long time , but if your system has been plumbed wrong then it may use more
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