Failed DD3?

[Stormcloud]

OK, guys.   Air holds fine when parking brakes applied.  Plunger in to release parking brake, and air is dumping at the back by tag axle.
Could be relay valve, could be bad DD3. or line line, or .......

Compressor barely keep up with air loss at higher RPM.

A suggestion was made to disconnect the bad DD3 to make bus driveable to get parked in an RV park, and get parts ordered.
If so, do all 3 lines have to be plugged at the can? or just 1? 

Stuck here for a few days. 

Thanks.
Mark

[thomasinnv]

OK, guys.   Air holds fine when parking brakes applied.  Plunger in to release parking brake, and air is dumping at the back by tag axle.
Could be relay valve, could be bad DD3. or line line, or .......

Compressor barely keep up with air loss at higher RPM.

A suggestion was made to disconnect the bad DD3 to make bus driveable to get parked in an RV park, and get parts ordered.
If so, do all 3 lines have to be plugged at the can? or just 1? 

Stuck here for a few days. 

Thanks.
Mark

First thing you need to do is try to determine exactly where the air is coming from. Is it coming from the relay valve? Inversion valve? That would help to narrow down the possibilities and tell you where to start investigating. Might not be the dd3 at all. More than one component comes into play just at the push or pull of the park brake brake valve.

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[Stormcloud]

Always think the worse, but hope for the best.  Likely one of the thinnest mechanics I have ever seen came out, and slid under the bus to track the air leak. ( Yes, I blocked the body up first.)

Two air lines to DD3 rubbing together, one was worn through causing the leak.

He is sourcing a replacement hose or, at minimum, splice kits.

[chessie4905]

If it is the hoses connecting to dd3, common on trucks too. Take old ones to truck supply or big truck stop or NAPA.

[luvrbus]

Always think the worse, but hope for the best.  Likely one of the thinnest mechanics I have ever seen came out, and slid under the bus to track the air leak. ( Yes, I blocked the body up first.)

Two air lines to DD3 rubbing together, one was worn through causing the leak.

He is sourcing a replacement hose or, at minimum, splice kits.

Lol I just repaired a Eagle 1 line was bad on the supply to the DD-3 he thought the worse too 8 bucks, it wouldn't have been that much but I replaced the DOT tubing with a rubber hose to get more flex

[Paso One]

Glad to hear you had a nice and easy repair.