What is usually wrong with the ABS on E/J coaches ?

[someguy]

I've seen several E/Js with the ABS light on.   What is usually wrong with them ?  Wheel sensor ?

Will a coach pass inspection with the ABS light on or does it have to be fixed ?

[richard5933]

Don't know where you're located, not even which country. Hard to know what kind of inspection you're asking about.

[lostagain]

I don't think it would pass any inspection with any fault light on. At least up here in Alberta and BC, a vehicle has to be in OEM condition to pass. BTDT.

[buswarrior]

What is usually wrong with them, is that the bottom tier operator can't be bothered to have their overworked, underpaid  "mechanic" look at it.

The last commercial operator wrings the last bit of good out of the coach, to the point it is not worth repairing to make money with it anymore...

And then we busnuts buy it, and have all the misadventure and $$$$ spending that we read about on here, up to the end of the busnut's budget, and then silence.

I would be surprised that the ABS light WASN'T on... and then i would check that the bulb is actually connected...

Happy coaching!
Buswarrior

[richard5933]

I don't think it would pass any inspection with any fault light on. At least up here in Alberta and BC, a vehicle has to be in OEM condition to pass. BTDT.

Understood. I would assume that anyone in Canada needing an inspection would be aware that properly functioning brakes would be required.

Down here in the US, it's unusual for any privately-owned bus being used for non-commercial purposes to require inspections of any kind unless the owner wants it.

Since we don't know where someguy is located it's hard to answer. That's why I was asking which inspection he's talking about.

[usbusin]

Since we don't know where someguy is located it's hard to answer. That's why I was asking which inspection he's talking about.

I would say BC.  That is why he is concerned about inspections.

[someguy]

So what goes wrong with the ABS system on these buses ?  Is it hard to fix ?

[Van]

I'll Give you a hint, it is in the Air brake Maintenance/inspection schedule and is often over looked even by seasoned repair professionals  

[buswarrior]

So what goes wrong with the ABS system on these buses ?  Is it hard to fix ?

Everything?

Sensors, activating valves, control unit, and all the exposed wiring in between them.

Sky is the limit, throwing parts at it gets old really quickly, proper diagnosis takes time.

Add in the "repair attempts" by the last guy... piercing wires is still acceptable diagnostic behaviour in this crowd of godless heathens...

the bottom tier fleets don't have spare coaches, it has to go back out in the morning, other coaches need more pressing repairs, and on it goes.

Your exposure potential likely will be some re-wire in the worst of the exposed areas,  and some of the parts, the entire mess will have some re-usable good bits.

Happy coaching!
Buswarrior

[someguy]

Whatever.

https://www.youtube.com/watch?v=j-yA0PMEr6s

https://manualzz.com/doc/746468/unlocking-braking-knowledge--mci-abs-systems-your-webinar...

MCI does a good job of documenting things for owners and service people.  This is so much better than owning a Ford truck where you are basically on your own.

[Jim Blackwood]

Why do you ask if you don't want to know?

Jim

[usbusin]

He knows it all.  Just pulling our chain.

[windtrader]

Why do you ask if you don't want to know?

Jim

The larger question is why y'all keep replying at all and taking the abuse?

[Van]

 It would appear he is some sort of Truckee (of the arrogant kind) and will mostly approach the ins and outs of buses as such, actual bus ownership will cure that.

[someguy]

How many of you actually have bus with ABS that would even know about it ?

The quick answer to my original question is 80% of the time there is something wrong with a wheel sensor.  But it might be an ABS modulating valve.  Looks to be fairly easy to troubleshoot.

I'll ask elsewhere next time.