US21P - UltraStop P32 Upgraded Park Brake Pump Pressure Switch

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Part# US21P

This kit Replaces GM Part Numbers:

GM# 15961566
AC Delco# 15034355
Workhorse Part# W8001073

Applications:

All P-Chassis 1996-2004 that use an automatic apply parking brake system with an electrically driven hydraulic pump.

Features:

Replaces the factory "High Failure" pressure switch on the pump commonly referred to as the "Rotten Green Switch" or "RGS".
This pressure switch is rated at one million cycles of operation.
These have a Lifetime failure replacement guarantee to the original purchaser. (Part replacement only, no labor)
Easy installation and comes with instructions.

INSTALLATION INSTRUCTIONS

I have the same issue as Brian, in this chain, and I am wondering what the result was. Prior to this, my pump would turn on erroneously and I wondered if there was either a flaky pump pressure switch or the system was actually not getting up to pressure, but now that the brake has failed - presumably due to roasted brake pads because the brakes wasn’t fully disengaged - I would think that the system wasn’t getting up to pressure. How would a pressure switch that detects that the system is above a certain pressure cause the brake to fail? Unless the switch was weak and detected it was at pressure when the pressure was still low...

Anyway, wondering if there’s any feedback on this one, so that I know what to order. ( Jesse, 09/07/2020 )

Jesse,

I recommend going through these support articles to find the issue with your brake.

J71 Parking Brake Diagnostic Articles

Those factory style pressure switches are just total garbage, so it can fail in many ways. I would not be surprised if it did not allow the pump to build to the proper pressure, or cycle the pump on and off randomly.

( Support )

My autobrake feature on my 2002 Coachmen pathfinder workhorse 8.1 is not working. The RV will not engage into park, nor does the E-Brake (yellow pull lever). When I place RV in park it keeps rolling. When I start the RV the Auto Park light comes on as well as the parking brake light on the dash. When I shift into drive or reverse I hear it do it's thing and i'm able to drive normally, however when I put it back into park nothing happens. I have to have someone put blocks under tires in order to exit the vehicle. My question is - does this new switch that replaces the RGS fix this issue or should I be looking at something different? Thanks ( Brian, 08/10/2020 )

The auto park brake system is spring applied and hydraulically released. It sounds like the brake locked up for some reason at some point and roasted the brake shoes inside the drum. I would recommend replacing the pressure switches regardless as that is what could have caused the brake to engage, but you will likely need to replace the park brake shoes. ( Support )

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WARNING PROP65 - see details above The state of California requires that this warning be posted for people purchasing products that reside in California.

WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

VIN Verification Service Item

This product allows for a VIN verification service.

VIN part verificaion is a service that we provide free of charge when a part is purchased.
When you provide your VIN below we will personally verify your part selection by your VIN before shipment of your order.
This helps ensure that this is the correct part for your vehicle.
This is not an automatic VIN check, it is done by a parts specialist once order is placed.
We can only VIN verify vehicles back to model year 1996, if older we can help but can't guarantee fitment.
If you would like to have your part selection verified before purchase please call or email us.