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Old 01-05-2023, 03:27 PM   #1
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Join Date: Nov 2016
Location: Clarks Summit, Pa
Posts: 16
plastic sensor broken on master cylinder

I have a 2002 Itasca Sunflyer on a Workhorse W22 chassis. I popped the hood today and found what appears to be a plastic sensor broken off the master cylinder. The body of the sensor has 2 wires attached to it and the piece still attached to the master cylinder has a small metal rod protruding from it. The front part of the sensor screws into a threaded hole in the master cylinder, that's where it broke off. What is it for? Where can I get a replacement?===
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Old 01-05-2023, 07:34 PM   #2
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Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,502
If there is no fluid leaking from the pin portion attached to the master cylinder body, just apply some electrical tape around the wires on the hanging part of the switch so they can’t short against something, and secure the wires with zip ties to a nearby harness. The broken switch I believe is called pressure differential, or over center switch. There was a service bulletin many years ago concerning this breakage, and the repair.
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Old 01-06-2023, 03:46 AM   #3
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Join Date: Oct 2019
Location: indiana/florida
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ultra rv carry's this part, i replaced mine a couple years ago.
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Old 01-06-2023, 01:40 PM   #4
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Join Date: Nov 2016
Location: Clarks Summit, Pa
Posts: 16
Thanks for the info guys. I stumbled on a Youtube video that covers the purpose of the sensor in question in quite a bit of detail. I now know what it's for and how it works. I also ordered a replacement. Now all I have to do is get the broken end of the sensor out of the threaded hole in the master cylinder. Thanks again all.
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