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06-13-2014, 10:14 AM
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#1
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,788
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Park brake question
Been wondering about something. What would happen if you're driving down the highway at 60 mph and pull the park brake on? Just curious!  
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-13-2014, 10:20 AM
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#2
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Senior Member
National RV Owners Club
Join Date: Jun 2010
Posts: 4,581
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This was dicsussed at the Camp Freightliner session I attended a couple of years ago and Mike said it does not lock up the brakes but does apply the brakes hard - or he used a similar phrase.
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 Bob & Sandi, dogs Tasha a Frenchie and Tiki a Skipperkey
SW OREGON 2005 34 foot DolphinLX
If towing: a bright red 2016 Mini Cooper on a tow dolly.
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06-13-2014, 10:22 AM
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#3
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,788
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Bob, mine is a Roadmaster chassis but it probably works the same way. Maybe some others with that chassis will jump in. Thanks!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-13-2014, 11:12 AM
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#4
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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All air brakes work the same. They are not RV specific and I believe there's not too many suppliers.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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06-13-2014, 02:27 PM
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#5
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Senior Member
Join Date: Nov 2012
Location: Keeseville ny
Posts: 648
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Using the park brake at 60 you will flat spot all your rear tires. You may loses tearing control if the back end goes side ways. We do it at 20 mph on a N.Y. School bus road test. I would not ant to do it t 60.
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06-13-2014, 02:32 PM
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#6
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Senior Member
Join Date: Nov 2012
Location: Keeseville ny
Posts: 648
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I meant to type turning control. I better start checking myself, my I pad misses letters. Lol
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06-13-2014, 02:37 PM
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#7
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Senior Member
Fleetwood Owners Club
Join Date: Sep 2012
Location: Vancouver Island, BC
Posts: 854
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If your unit is equipped with anti-lock brakes, you will come to a hard controlled stop. If you don't have anti-lock brakes all the wheels will lock up and flat spot your tires, not to mention possible loss of control if you aren't on it.
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Brian & Nicola
2013 Discovery 40E "DISCO"
TOAD 2014 Wrangler
Xeena(German Shepard)
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06-13-2014, 02:47 PM
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#8
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Depends on the vehicle and the parking brake.. On a ride with air brakes you blow the tank and the spring brakes come on, Frim but generally not a lock up.
On a motor home with drive shaft braking bad things can happen.. If the brakes lock up tight you will most likely loose control of the ride
On a car when rear wheel emergency brakes you WILL loose control if they are working right, spin out, and if it is an SUV built on too small a frame and built too high (Think FORD standard practice) the roll over and die options is very possible.
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Home is where I park it!
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06-14-2014, 06:38 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jul 2011
Location: B.C.
Posts: 4,638
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It takes minimum of 60 lbs. of air to release your parking brake. That said it would be the same or worse than slamming on your brakes as hard as you can. Like said the antilocks will kick in and you should not slide a wheel. Depending on road condition and the traffic behind you it would not be a wise move.
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Dennis & Marcie & Captain Hook The Jack Russell,aka PUP, 2006 Itasca 29R 2017 Equinox toad. RVM59
We came, we went, nothing broken, nothing bent!
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06-15-2014, 07:57 AM
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#10
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Senior Member
Newmar Owners Club
Join Date: Jun 2013
Location: MidWest
Posts: 1,062
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Quote:
Originally Posted by MSHappyCampers
Been wondering about something. What would happen if you're driving down the highway at 60 mph and pull the park brake on? Just curious! |
Sure hope you have everything tied down!! 
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Ken & Anita[FONT=Lucida Console] 2011 Newmar Essex,4522,Cummins 500 ISM,2013 CRV,RVI2 Brake with TPMS
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06-15-2014, 09:05 AM
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#11
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Senior Member
Monaco Owners Club Forest River Owners Club
Join Date: Jul 2012
Posts: 3,331
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The spring brakes are not part of the anti lock system . Once you lose the air pressure that holds them back they apply! , and full force. Loosing air pressure by failure of the air system or pulling the brake valve is no difference. They may not lock up depending on the weight and force on them but you will stop .. And quickly. It's important to understand the air brake system and how different it is .
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2023 Coachmen Encore 325SS
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06-15-2014, 09:13 AM
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#12
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Senior Member
Holiday Rambler Owners Club
Join Date: Dec 2011
Location: Iowa
Posts: 730
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When the highway is wet from rain even the engine brake will take you for a ride if you forget to shut it off. I would hate to think what pulling the Ebrake would do.
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Counting down the days until our next great adventure!
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06-16-2014, 07:21 PM
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#13
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Senior Member
Join Date: Nov 2011
Posts: 884
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Park brake question
Quote:
Originally Posted by cwit
Using the park brake at 60 you will flat spot all your rear tires. You may loses tearing control if the back end goes side ways. We do it at 20 mph on a N.Y. School bus road test. I would not ant to do it t 60.
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No, you will NOT flat-spot the tires. You will not slide the rear wheels. You will not lose control. The springs do not apply the brakes that strongly. The wheels might slide if this happened on wet pavement, but on dry pavement it's not an issue.
If you pull the big yellow knob at 60 mph, you will make a quick, hard stop...that's all. I have done it, at 60 mph, so I could see exactly what to expect should I ever lose the air all at once. It was no big deal.
Rich & Linda
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06-16-2014, 09:41 PM
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#14
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Senior Member
Join Date: Sep 2012
Posts: 1,177
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i know on really old trucks and well used brakes you can roll the cams all the way over in the drum and be stuck there in tell you pull them apart and fix them ... and that is every hard to do with lucked up drums
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