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PacBrake compressor problems


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#1 jcasper

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Posted 31 January 2018 - 09:18 AM

My pacbrake has been on my truck for about 10 years.   Lately the compressor never stops running or takes a long time to build pressure.  

 

I think the compressor is just tired.   It is running so much now it has made it loose on the mounts so it also rattles around.   

 

My thought is that I just order a new compressor for $160 and bolt it up.   Am I missing anything else I should check or am I on the right path?



#2 Torque Monkey

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Posted 31 January 2018 - 10:26 AM

Once it builds pressure does it hold it? Meaning could there be a leak in the system? Those compressors are pretty cheaply built (in Pac-brakes defense, they all are) I am actually surprised you got 10 years out of it. Even if it is just sitting most of the time the compressors don't age well.



#3 jcasper

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Posted 31 January 2018 - 10:27 AM

Once it builds pressure does it hold it? Meaning could there be a leak in the system? Those compressors are pretty cheaply built (in Pac-brakes defense, they all are) I am actually surprised you got 10 years out of it. Even if it is just sitting most of the time the compressors don't age well.

Yes, once it builds pressure for the day it seams fine unless I drain it with the air horns.    

 

Overnight then yes it loses pressure so maybe a real small leak somewhere but not a major one.

 

I am also surprised mine lasted 10 years.   


Edited by jcasper, 31 January 2018 - 10:28 AM.


#4 Torque Monkey

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Posted 31 January 2018 - 10:31 AM

Yeah, that compressor has earned it's keep I would say. You could always upgrade to engine driven... just sayin. :lol:



#5 jcasper

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Posted 31 January 2018 - 10:45 AM

Yeah, that compressor has earned it's keep I would say. You could always upgrade to engine driven... just sayin. :lol:

Sure, Can I drop it off Saturday?    B)

 

This truck is now the horse trailer hauler and barn truck.   I use it when I have work clothes and muddy boots.   

 

The new truck stays nice and clean now.



#6 Torque Monkey

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Posted 31 January 2018 - 11:58 AM

Certainly, as long as there is a check for about $2,000.00 for me on the seat. It will all be taken care of. :lol:



#7 jcasper

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Posted 31 January 2018 - 12:09 PM

Certainly, as long as there is a check for about $2,000.00 for me on the seat. It will all be taken care of. :lol:

If this was 10 years ago I'd do it.   Now, I think a replacement that bolts in will do just fine.   



#8 jcasper

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Posted 31 January 2018 - 01:57 PM

Bill has a new compressor headed my way.   



#9 Abbyfireguy

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Posted 01 February 2018 - 12:03 PM

The one way check valves can quite often be the culprit... Easy to unscrew and find out if it plugged or blocked ...
Mine has done it twice over the years..
something you can check in a minute or two without disassembly.
This picture shows what I mean. Its not my truck, but will give you an idea what I am talking about.
This valve fails enough that Pacbrake checks it first for issues like yours..

Attached Files


Edited by Abbyfireguy, 01 February 2018 - 12:10 PM.


#10 jcasper

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Posted 01 February 2018 - 12:21 PM

Interesting.  I'll check that out also. 



#11 jcasper

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Posted 19 February 2018 - 03:58 PM

I put a new compressor on and all seems to be good.   I never did check that check valve.   Already had the pump ordered when I thought about it.    

 

Seems at 220,000 miles the truck is starting to sweat a little.  I'd post pics but it doesn't work very well.



#12 jcasper

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Posted 19 February 2018 - 03:59 PM

Picture try

Attached File  IMG_0201.JPG   462.37KB   3 downloads
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ce584b217ba84aa7331b670ac1c85099.jpg
ef114b5d0ec6e075044a7902552bcde2.jpg


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#13 marksmith

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Posted 20 February 2018 - 08:01 AM

Top is just a rocker box gasket.

Very typical for an older truck. The heat makes the rubber hard and itll start weeping.

#14 Austin The DieselTech

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Posted 20 February 2018 - 07:18 PM

Thats is a very very minute leak on the rocker box but very easy to replace.

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#15 jcasper

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Posted 20 February 2018 - 09:34 PM

What about the bottom

#16 Austin The DieselTech

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Posted 20 February 2018 - 10:09 PM

What about the bottom

Worth a shot but try snugging the bolts up a little and if not, pan gasket.

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#17 stroketeck

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Posted 21 February 2018 - 09:11 AM

if you wash the engine more often you would not know you have a small seep



#18 jcasper

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Posted 21 February 2018 - 09:49 AM

if you wash the engine more often you would not know you have a small seep

Yeah, I'll have to clean things up one of these days.   



#19 GTroyer

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Posted 21 February 2018 - 11:40 AM

if you wash the engine more often you would not know you have a small seep

 

you mean your supposed to wash them , now ya tell me   LOL   .... mine saw a pressure washer oh three or four years ago 



#20 Abbyfireguy

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Posted 20 March 2018 - 06:52 PM

My old girl has a few leaks and wet spots! (The truck guys,,the truck!) Sheesh, glad the better half doesn’t look at this site!




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