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dsalinas1939
Top Member
USA
1323 Posts |
 Posted - 01/07/2016 : 10:45:09 AM
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| i have this ic bus and there is no brake pressure to rear wheels i am assuming the pump is bad witch pump controls there rear is it the one in the back |
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steveolboy
New Member
8 Posts |
Posted - 01/07/2016 : 12:10:29 PM
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| I would say " you are correct sir!". An Ed McMahon reference foy you all. The rear accumulator controls the rear, and the pump is the same. Go to wabco's document MM-0401 and it will take you through all the troubleshooting steps. Not for sure, but parts for these came in large expensive assemblies a few years back. |
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busdoc
New Member
USA
3 Posts |
Posted - 01/08/2016 : 08:43:37 AM
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Below is an excerpt from the IC service manual for the FPB system.
Both pumps are located in cavities in the HCU, and are accessed from the bottom of the HCU. The retaining plug for the secondary system pump is visible on the bottom of the HCU ( FIGURE 66 ). While this pump is located nearest the front of the HCU, it pressurizes the rear axle brake system.
The retaining plug for the primary system pump is located under the relay valve assembly. This pump pressurizes the front axle brake system. Accessing the primary system pump requires moving the relay valve assembly.
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dsalinas1939
Top Member
USA
1323 Posts |
Posted - 01/08/2016 : 09:46:25 AM
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| ok the rear pump is nnot working that would be just an electric motor gone bad correct ? cause i called ic and told them i need a pump and they sent me a hydrolicc rebuild kit i am think i need just a motor? |
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busdoc
New Member
USA
3 Posts |
Posted - 01/08/2016 : 11:49:23 AM
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| The pump motors on the FPB HCU's are not serviceable. If you have a defective motor you will have to replace the HCU. |
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eddo
Advanced Member
USA
311 Posts |
Posted - 01/11/2016 : 08:15:09 AM
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| Make sure to have IC double check for warranty. We were having a ton of issues with these, and WABCO extended the warranties on some parts of the system for several (I want to say 5?) years. |
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dsalinas1939
Top Member
USA
1323 Posts |
Posted - 01/11/2016 : 09:02:01 AM
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| yeah we had a bunch covered to but this busseven years old so its way past there warrenty but thanks for the info |
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iceracer
Active Member
32 Posts |
Posted - 01/11/2016 : 11:04:18 AM
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| Good luck with that system. We have about 35 units from 2005-current with the same system. Problems, problems, problems. We figure 2-3 HCU each year, about $4k/unit with labor. Another big issue is in northern climates, the road salt wreaks havoc on all electrical, terminals, wiring, etc. |
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04IC#14
Senior Member
United States
51 Posts |
Posted - 01/19/2016 : 10:02:18 AM
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| One thing we've done that's cut down on motor burnouts is when you first turn the key on let the brakes build up pressure the turn the key off, turn it back on to cycle the manifold heater then start the bus. Our mechanic figured starting the bus with the electric motors still building pressure was causing too much of a power draw to the motors and was burning them out. Don't know if there's anything to that or not, but we've replace a lot fewer motors since starting them that way. |
Brandon
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dsalinas1939
Top Member
USA
1323 Posts |
Posted - 01/19/2016 : 11:14:44 AM
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| anything is possible except for getting the drivers to start the bus like that lol its hard enough to get some of them to wait for the intake heater light to go out i am constantly screamin about that but they dont listen |
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wabco hpb
