US21P - UltraStop P32 Upgraded Park Brake Pump Pressure Switch

On SALE!

Click Image for Gallery

Made in America

Verified to have been manufactured in the USA

PLEASE READ!!!

Order Shipment Notice:

Most orders are shipped within 24 hours from the order date. Orders placed on the weekend or after cutoff on Friday, and orders placed on select holidays are processed on the next business day. Please see our shipping terms for more information.

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 a 2003 Airstream Land Yacht P32 Workhorse. 2 issues:
Auto Park light stays on once RV is started. It parks when I place in park and you can hear the pump disengage when I place in drive. I think the brakes are partially engaged. Will both of your switch upgraded fix this issue?
My second issue is that after numerous brake repairs of sorts several months ago our Power Gear jack system dash panel fails to turn on. Fluid is normal level and operation was normal until this point. Inline fuse intact. It came on one time after not working but that was it. Does the Auto Park issue prevent Jack system from going operational? I would imagine the power would still turn on the jack system even if there was a safety feature that was activated. ( Adam, 06/04/2024 )

Hello Adam, I would recommend giving us a call to help with diagnosing those issues. Most (if not all) leveling systems do require the brake to be set before they will operate, so the leveling system may not be getting the "signal" that the brake is applied.

You can call us at 800-417-4559 .

( Support )

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 )

Ask a question

Your Name

VIN...(This is helpful):

Your Question

Note: HTML is not translated!

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.

Shipping Insurance Notice

NOTICE: For orders outside of United States

If you are placing an order to ship outside the United States, Shipping Insurance will be required and added automatically at checkout.

Views: 43841
Brand: UltraStop
Product Code: US21P
Availability: 6

$160.65
$119.00

Available Options

VIN Number

Have us Manually Verify Part by VIN Before Shipping

Qty

Add to Wish List Compare this Product

0 reviews / Write a review

US21P - UltraStop P32 Upgraded Park Brake Pump Pressure Switch

Made in America

PLEASE READ!!!

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.

Ask a question

Write a review

VIN Verification Service Item

Shipping Insurance Notice

Available Options

US21 - UltraStop P32 Park Brake Pressure Switch Upgrade Kit

US22 - UltraStop P32 Park Brake Pressure Switch Bushing & Relay Upgrade Kit

W8000557 - P32/P42/W42 Propshaft Park Brake Drum Asm (with Yoke)

W8000498 - Park Brake Pump Assembly With Motor

US21.5 - UltraStop P32 Park Brake 70 Amp Relay And Bushing Kit

15961566 - Switch Asm - Park Brake Pump ( AKA Rotten Green Switch or RGS)

W0005235 - Actuator Asm - Park Brake (With Bracket)

W8001071 - Switch - Actuator Pressure (Park Brake)

W8001073 - Switch Asm - Park Brake Pump (High Pressure)

W8001076 - Park Brake Pump Motor (12 Volt Dc)

773776 - J71 Park Brake Pump Poppet Valve Asm

410462 - J71 Park Brake Pump Spring

12L14 - J71 Park Brake Pump Hex Adapter Bushing for RGS

US21A - UltraStop P32 Upgraded Park Brake Actuator Pressure Switch

15018962-USP12 - P12 Park Brake Pump Assembly With Motor (Aftermarket)

412211 - Park Brake Pump Replacement Motor

12124819PT - Park Brake Pump Pressure Switch Connector Pigtail