SAMRO S338RJ Curtain Trailer (2002) - Pneumatic Brake System Fault: Disc Brakes, ROR Axles, ABS

Hello,
I have a problem with the SAMRO curtain model S338RJ. Born in 2002. Disc brakes. Axes ror. ABS.
The problem is that the trailer does not get the right pressure or no air on the brakes. They are all tightened and there is no reaction to the manual or working brake with the tractor attached, and also to the valve unfastened with air.
The first suspicions are on the unresponsive parking and release valve on the trailer, or on the brakes quick release valves.
The semi-trailer was not used for a long time before, everything was fine. Recently, the discs, pads, regenerated calipers, one brake cylinder and a brake valve / regulator were replaced.

Maybe someone had a similar case and will tell you. I will be grateful!

Check the slot filters on the trailer hoses, they should be installed behind the connectors (yellow and red), some trailer models are not used. Check the directional valves between the air cylinders.

It would be advisable for you to specify what brake system the trailer has. Wabco, Knorr-Bremse, Haldex or a photo of the valve and the number of the park-release valve.

Haldex brake system. Park-release valve replaced today. Works but still no response at the brake cylinders.

Is the departure protection working?

Did not work. The brakes do not react to anything.

This is interesting. It is necessary to disconnect the modulator output and at least eliminate its fault. The valve is supposed to block the brakes below a 3.5 bar drop on the tractor power from what I remember. I'm going to find out which one it is. Or you've got the wrong leads my friend.

Nobody messed up 90% of the cables, because the previous owner simply neglected it. It looks like something is blocking her. A moment earlier, there was also a problem with lifting pillows, but here the situation has improved and it is ok.

The 21 TrCM + output enters modulator 4. The control is to be on disconnected power supply and full pressure in the trailer, or with the brake pedal pressed. Rather, the 10% you have wrong outputs, because how can the protection not work like a new multivalve. Something is wrong. Or someone has already fought hard with what he mixed up.

There is air in all cylinders ??

My colleague, you have still not specified which park-relief valve you have replaced. In the appendix I give you two types produced by Haldex, one of them shows the installation diagram. Check that you have a properly connected valve.

Hello,
The valve I listed is exactly like at the link: https://www.haldex.com/globalassets/europe/documents/air-brake/700034.

What's your ABS valve? Below is the installation diagram for eb + II.

At the ABS valve, I found only the marking: 020122 and the inscription Haldex below. It looks like the one from the link: http://www.ebay.de/itm/Haldex-020122-Modulator-ABS-Einheit-Unit-/152542491586.

So it is ABS MODULAR. Below is a diagram of the pneumatic installation. The second is diagnostics manual electrical diagram SERVICE MANUAL ang.

Thank you very much for the sent diagram! It turned out that the yellow and red wires were swapped. Everything is already working