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Topic: Parking brake won't release (Read 1696 times) previous topic - next topic

Parking brake won't release

Stuck at rest stop with stuck parking brake. Need advice.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #1 –
Is your air building up above 65psi?

Roland
1993 U280 4341
2010 Jeep Liberty
The Pied Pipers

Re: Parking brake won't release

Reply #2 –
Yes
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #3 –
Does the brake knob stay pushed in when you try to release the parking brake.

Roland
1993 U280 4341
2010 Jeep Liberty
The Pied Pipers

Re: Parking brake won't release

Reply #4 –
It finally released. It does stay pushed in. Have tested several times, now seems to be working.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #5 –
Air pressure steady at 115 and 120.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #6 –
I was checking some diagrams may have had a stuck valve or one going bad. Glad you got it released.

Roland
1993 U280 4341
2010 Jeep Liberty
The Pied Pipers

Re: Parking brake won't release

Reply #7 –
Do you think I should abort trip? Only 60 miles from home.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #8 –
Cycled it 15 times successfully
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #10 –
Think I would continue the trip. Refresh in your mind how to disable the parking brake springs and be sure you have the tool to release them in case it decides to set to park again going down the road.
Be sure to chock the coach if you have to get under there to release them.
John Duld
1995 U320C SE 40'

Re: Parking brake won't release

Reply #11 –
Best to be hooked to a tow truck before you cage the brakes...
Mike and Mari
'98  36 270 WTFE
Build #5272
Club #17504

Re: Parking brake won't release

Reply #12 –
D2 valve is oil  fouled.  Mine did the same thing.

Replaced.  Raised the D2 to 110/130.  Better brakes
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Parking brake won't release

Reply #13 –
Made it to first campsite. Anybody point me to link how I could release parking brake if stuck. Still a newbie. I've got chocks and safety supports for frame with me and some tools. Thanks for the quick reply to my post. Much appreciated.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #14 –
Physically back off the spring chambers.  But then zero parking brake.  Fix the D2 valve imo,

It took me pulsing the brake pedal until near zero pressure to have the stuck valve open and build pressure.

You are at the beginning of that bad of a failure I think..

You have time to find a shop and replace the valve.  Get the higher pressure one
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Parking brake won't release

Reply #15 –
Okay thanks.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #16 –
Don't mess with the highly loaded spring parking or emergency brake cylinders, can kill you if you don't know what you are doing.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Parking brake won't release

Reply #17 –
Quote from: Realmccoy –
Air pressure steady at 115 and 120.

With air pressure like this, not sure we have any indication that the D2 (air compressor governor) is at fault. 

Low air pressure, absolutely look at the D2.  And the parking/emergency brake is set up to NOT release with low air pressure.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Parking brake won't release

Reply #19 –
I've had the issue before on my truck. It was the relay valve sticking. When it wasn't releasing did the handle stay in at that time? If not the dash valve was the culprit. I have had to replace them but not for failing to release brakes.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Parking brake won't release

Reply #20 –
 The dash valve didn't feel right when it was stuck. It didn't feel like it was pushing in cleanly like it normally does.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Parking brake won't release

Reply #21 –
Quote from: Realmccoy –
The dash valve didn't feel right when it was stuck. It didn't feel like it was pushing in cleanly like it normally does.
They are simple and inexpensive.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Parking brake won't release

Reply #22 –
In your travels stop at a Napa store and tell them you need a Haldex 20021 dash parking brake release valve.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094

Re: Parking brake won't release

Reply #23 –
I had the DD3 parking brake chamber stick on my 4107 bus right in the middle of the road in Rocky Mountain National Park. I stopped so the kids could take a close look at a couple of marmots. I spend about 20 minutes trying to release it, built air, tried again and again. Lots of cars behind me by that time. Finally, it released and away we went. Never stuck again and I pulled it apart and rebuilt it at home. Was really nasty inside. How easy it is to take releasing the brakes for granted. How paranoid you can be after it happens if along way from home.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Parking brake won't release

Reply #24 –
Will be stopping at Napa.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.