W8001667 - J72 Propshaft Brake Assembly (Allison Transmission)

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Part# W8001667 - J72 Propshaft Brake Assembly

Description:

Replaces function of parking pawl in transmission to hold coach in place when Park position is selected. Uses internal spring force to apply self contained clutch style brake assembly. Brake is released by collapsing internal spring from hydraulic pressure provided by external electric hydraulic pump assembly.
Mounts on back of transmission, often called Propshaft parking brake or Driveline parking brake.

Recommendations:

It is highly recommended that Part# US20-78 is installed when installing this new brake. Part# US20-78 prevents the brake from applying while the coach is in motion causing the damage that makes the brake not hold, and or leak.

Application:

Workhorse W-24 2004-2007
Also Fits Freightliner FRED Chassis (Freightliner Part# 12-21652-000)

Installation:

This part is on back order. do you know of anyone that rebuilds these brake assemblies? ( JOE STILLWELL, 08/09/2024 )

Hello, those are not rebuildable , however we are expecting them mid-September . You can call in and place a pre-order if needed to ensure you get one, we are expecting to get 20 of them and a couple are already spoken for. ( Support )

My brake will not release when I try to shift into Drive. The electronic shift indicator does not change out of the P indication. I just need to know if this is the correct part for the application. ( John Fleming, 09/08/2020 )

This is the correct brake assembly for your Freightliner but if it was bad, it typically would have the opposite issue in that the brake would not hold. My guess is there is an issue with your Allison transmission neutral position switch that isn't telling the brake to disengage because it thinks it is still in park. ( Support )

I need to verify this is the brake assembly I need for my 2005 W24 chassis. Can you verify shipping costs to Canada postal code K7A 4S7

Also should I change the seal in the tail of transmission while changing park brake assembly? ( Jason Steacy, 08/03/2020 )

Jason, That is the correct part based on your VIN, for shipping you would have to email us your complete address. Please email to support@urvp.com. You can change that seal while you have it apart, that would not be a bad idea. ( Support )

Hydraulic auto parking brake will not engage and hold the RV in place. I’ve been told if that happens the J72 parking brake unit needs to be replaced. ( Vince Thomas, 06/17/2020 )

Vince, You would need to replace the brake on the back of the transmission. Part# W8001667 based on your VIN. Please highly consider installing the US2078 kit with that brake, as that new brake will fail again without it installed. The factory controllers and the wiring are known issues causing brake failures, this kit is a roadblock for those issues to damage the brake. ( Support )

2005 Workhorse Parking brake leaking out bottom. Is W8001667 the correct number for assembly. Is a kit available. Let me know and price. Thanks. ( Victory Ford Lincoln, 05/15/2020 )

Yes W8001667 is the correct part and that is the only way to get it, no internal kit available. Contact us directly for wholesale pricing 800-417-4559. ( Support )

Just to verify that the J72 transmission brake assembly is the one I need for my Workhorse chassis.

Thanks.

Dan ( Dan Holloway, 05/26/2017 )

Dan,

Looks like you have the GM 4L85E transmission so you need a different brake assembly, this one is for the Allison transmission. Here is a link to the one you require: https://www.ultrarvproducts.com/Auto-Park-Brake/W8003103-Brake-Asm-Propshaft-Park,-Without-Yoke-(Boxed)

( Support )

Just want to verify that the J72 prop brake assembly is right for my Workhorse chassis. Thanks. Dan ( Dan Holloway, 05/26/2017 )

Not answered yet.

What's torque spec for the gear that attaches to the yoke? ( Corey, 03/31/2017 )

89 ft.-lb. torque. ( Support )

Can it be rebuilt? Mine is leaking fluid.

( tom laudicina, 01/07/2016 )

Tom,

Unfortunately no, there are no serviceable parts to rebuild these brake units.

( Support )

IS THIS THE PART I NEED 2005 WORKHORSE W8001667 - J72 Propshaft Brake Assembly

( RON WOODALL, 12/09/2015 )

Ron,

Yes you have a W24 chassis and this is the correct brake assembly for the back of your transmission. We recommend installing the US2078 kit to prevent future brake lock-ups.

( Support )

Im installing a p/n 4198856 parking brake assy. And would like to know the torque spec on the unit to trans Case and yoke to gear

( curtis, 06/26/2015 )

The bolts attaching the brake assembly to the transmission housing should be torqued to 89 lb ft (121 Nm). The yoke attachment bolt should also be torqued to 89 lb ft.

( Support )

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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.