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05-08-2020, 09:14 AM
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#1
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Senior Member
Newmar Owners Club Winnebago Owners Club
Join Date: Dec 2010
Location: Golden, CO
Posts: 156
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Parking brake disengagement unusually harsh
Recently acquiring a 2016 Tiffin bus I am new to this forum. We love everything about the coach but every time I disengage the parking brake I cringe. It is far different than our previous coach in that it is not only hard to pull out but when it does release it snaps out so violently it literally stings my hand. Is this normal or is there an issue with the brake adjusters, which are suppose to be automatic I believe. Thanks for any thoughts.
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Russ and Anita
2016 Tiffin Allegro Bus 37AP SOLD
2022 Jeep Grand Cherokee Trailhawk 4XE (in tow...we hope)
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05-08-2020, 09:21 AM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,442
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I take it from your signature line that this isn't your first coach with air brakes .
The park brake control valve , could be from a different manufacturer than your previous coach , but the function is the same , the valve controls air pressure to the park brakes , so when your moving the knob , you're working against the supply line air pressure ; to either supply air to the park brake chambers to release the brake , or shut off air supply and vent the park brake chambers and allow their springs to apply the brakes. That movement is never going to be easy , due to the air pressure involved. I'd say if you have the coach in for service you could ask if the mechanic involved considers the effort excessive.
Operation of your auto slack adjusters , will not effect the park brake control effort.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-08-2020, 10:09 AM
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#3
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,512
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The Tiffin Bus is on their Power Glide chassis and apparently they use a different supplier or model of the brake control than Freightliner. The one on our current Phaeton Power Glide is definitely harder to pull and push than the one on our Allegro RED Freightliner. I actually like it better once I got used to it since it's not as likely to get accidentally pushed off. Just use two fingers under the knob to pull it and don't put your palm on top. As Skip said, the brake adjusters have nothing to do with the control knob.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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05-08-2020, 11:38 AM
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#4
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,367
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I agree with Dan, I don’t have a problem with our bus. But I do as Dan does, just use two fingers under the knob to pull it out.
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2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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05-08-2020, 05:42 PM
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#5
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Senior Member
Newmar Owners Club Winnebago Owners Club
Join Date: Dec 2010
Location: Golden, CO
Posts: 156
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First thanks for the thoughts. I misspoke as it is the engagement (pulling out the knob) that is the issue not pushing it in. I have other coaches with air brakes and none acted so harshly. Could it be an air dryer issue? The campground we are currently at so happens to be the location of a Tiffin 4x4 group and I have asked around. My issue is unique and probably requires a visit to a repair facility. The other solution, offered by one of the other owners, is to have DW pull it out!
__________________
Russ and Anita
2016 Tiffin Allegro Bus 37AP SOLD
2022 Jeep Grand Cherokee Trailhawk 4XE (in tow...we hope)
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05-09-2020, 10:51 AM
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#6
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,512
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Quote:
Originally Posted by colo.kids
First thanks for the thoughts. I misspoke as it is the engagement (pulling out the knob) that is the issue not pushing it in. I have other coaches with air brakes and none acted so harshly. Could it be an air dryer issue? The campground we are currently at so happens to be the location of a Tiffin 4x4 group and I have asked around. My issue is unique and probably requires a visit to a repair facility. The other solution, offered by one of the other owners, is to have DW pull it out!
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Pulling out is exactly what Gary and I are referring to. The knobs on the Power Glides are stiffer both in and out. If the other Tiffin owners have Freightliner chassis, then their operation will be different. Without actually feeling yours it's hard to tell if it's normal or not. It will not be a dryer issue but a mechanical controller. A light spray of silicone around the shaft might help if it's binding or you may have to get the opinion of a chassis repair center.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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05-09-2020, 07:05 PM
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#7
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Community Administrator
Pond Piggies Club LA Gulf Coast Campers Outdoors RV Owners Club Entegra Owners Club Skyline Owners Group
Join Date: Mar 2002
Posts: 40,722
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I've never had this type of parking brake before & didn't even think about it's operation until I saw this thread. Ours is stiff to pull out & it does seem to have a snap to it at the end that's been enough to break a nail if my fingers aren't in the right place.
I'll try the silicone first. If that doesn't help, we're due for chassis maintenance this summer so I'll ask then about it.
Thanks for bringing this up.
Lori-
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Lori (& Dave, my spirit guide) - RV/MH Hall of Fame Lifetime Member | My iRV2 Photo Albums
2016 Phoenix Cruiser 2350S, 2018 Phaeton 40IH,2006 Bounder 36Z, 2004 Cougar 285EFS, 2000 Aerolite 25FBR
There is great need for a sarcasm font.
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05-10-2020, 11:23 AM
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#8
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Senior Member
Join Date: Oct 2018
Posts: 1,269
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The brake control on the Breeze is similar (PG chassis). It is harder to manage than I expected. Not impossible, but wife may have a significant problem when she starts driving. So, perfectly understand your concern. Best to take advise from that offered above.
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Travel Safe and with a Smile! Pat
2020 Tiffin Breeze 33BR
2022 Cherokee Trailhawk toad
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05-11-2020, 04:26 AM
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#9
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Junior Member
Join Date: Mar 2012
Posts: 18
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Check the air pressure regulator. It should not be set higher than 125PSI.
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05-11-2020, 10:13 AM
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#10
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Senior Member
Newmar Owners Club Winnebago Owners Club
Join Date: Dec 2010
Location: Golden, CO
Posts: 156
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Quote:
Originally Posted by Treefarmer
Check the air pressure regulator. It should not be set higher than 125PSI.
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When driving my front and rear air brakes are around 125-130 which should be ok I believe.
__________________
Russ and Anita
2016 Tiffin Allegro Bus 37AP SOLD
2022 Jeep Grand Cherokee Trailhawk 4XE (in tow...we hope)
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