| Author | Message | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1815 Registered: 12-2000 Posted From: 76.68.134.27  Rating: |
Greetings sports fans! This new thread picks up from a thread drift in one originally titled: "Stupid bus door" started on Feb 20, 2010. Anyway... Back in 2006, RJ Long cooked up a little online knowledge challenge for busnuts as to using the parking brake while underway to stop. Brain Brown, crazy fellow that he is, skeptical at first, instead of talking about it, went out and video taped his coach stopping from 40 mph. In order to balance out the reporting, and have some historical fun, I took a video of a GM New Look doing the same thing from 60 km/Hr. Brian has kindly retrieved the videos and put them on You-Tube for our continued debating pleasure. However, before you watch, there is a postscript to the stopping distance of Brian's coach. His e-mail of today to me on my question as to what happened next with his coach, as I couldn't remember: " Yes, indeed. On my very next outing I discovered a leaking seal on the pax rear axle that had "pooped" a phenomenal amount of grease into the brake drum. I'm pretty confident that only one drum was essentially functional back there during the test. I fixed the issue (new seal, new drum. new pads, new grease, yadda yadda), but never re-ran the test. At present, the old girl is buried in snow. Hope that helps, and let me know if you have any other concerns, questions, etc. Brian" So, his coach stopped longer than it should have, the New Look stops pretty much the same as any other spring brake equipped coach I've driven. As far as the brake components know, whether you step on the brake pedal or apply the parking circuit, they are given a squeeze. So, let's stop exposing ourselves, eh? Here's the link: http://www.youtube.com/watch?v=EOx7J2_qetU happy coaching! buswarrior | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 812 Registered: 3-2007 Posted From: 71.53.153.91  Rating: N/A |
EXC ELL ENT BW!!! You got my vote! Gomer | ||
| George M. Todd (George_todd)
Registered Member Username: George_todd Post Number: 950 Registered: 8-2006 Posted From: 99.39.13.50 Rating: N/A |
He's got mine too! Don also!! Thanks, George | ||
| Paul Lawry (Dreamscape)
Registered Member Username: Dreamscape Post Number: 636 Registered: 5-2007 Posted From: 64.40.215.153  Rating: N/A |
Good information guys! Paul | ||
| Jack Conrad (Jackconrad)
Registered Member Username: Jackconrad Post Number: 1231 Registered: 12-2000 Posted From: 74.4.63.215  Rating: N/A |
As usual, great information from BW! Jack | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 1138 Registered: 7-2006 Posted From: 75.244.18.45 Rating: N/A |
Thanx for the tenacity, BW...good post! RCB | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 112 Registered: 3-2007 Posted From: 69.19.14.22  Rating: N/A |
Not a one up thing but I once had a volvo FG6 that had been converted into a travel trailer hauler. The rear axle had been removed and the frame shortened sort of looked like a bull dog. One afternoon I was out playing and had My Lab and Rat terrier in the cab and one of them managed to pop the magic yellow knob which was right betwen the seats. I would not try that on purpose for sure as after I peeled Myself off the wheel and the lab off the dash I made a clip so I would not have a reccurence of that act. To say wheel hop would be a understatement! John | ||
| Kyle Brandt (Kyle4501)
Registered Member Username: Kyle4501 Post Number: 541 Registered: 9-2004 Posted From: 65.23.106.193  Rating: N/A |
Anyone know how much air pressure is applied during a normal stop? I'd immagine most of us would be surprised to know how much (or little) air pressure is used during a normal stop. With trucks, the difference between loaded and no load would be huge. Might help bridge the gap in the debate. | ||
| Dale Waller (Happycampersrus)
Registered Member Username: Happycampersrus Post Number: 376 Registered: 7-2005 Posted From: 166.235.233.103 Rating: N/A |
"Anyone know how much air pressure is applied during a normal stop?" Great question! Also is there a difference between spring brake cans and DD3's when you pop the ole parking knob at 40mph? I know the answer (by accident), but would love to hear what will be said! (Message edited by happycampersrus on February 25, 2010) | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 858 Registered: 8-2006 Posted From: 74.32.83.4 Rating: N/A |
Kyle,I am about 20 lbs or less for normal stop 40 to 50 lbs for a hard stop good luck | ||
| Jim Wilkerson (Wagwar)
Registered Member Username: Wagwar Post Number: 31 Registered: 12-2009 Posted From: 12.158.159.62 Rating: N/A |
" Yes, indeed. On my very next outing I discovered a leaking seal on the pax rear axle that had "pooped" a phenomenal amount of grease into the brake drum." I don't know much about air brake systems, but I'm learning and I've learned a lot from this post and the 'studid door' post. So, not knowing any better, I had to wonder if the big grease poop mentioned above could have been caused by the emergency brake test itself? Or am I missing the point? | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 157 Registered: 5-2007 Posted From: 70.51.31.70  Rating: N/A |
quote"Not a one up thing but I once had a volvo FG6 that had been converted into a travel trailer hauler. The rear axle had been removed and the frame shortened sort of looked like a bull dog. One afternoon I was out playing and had My Lab and Rat terrier in the cab and one of them managed to pop the magic yellow knob which was right betwen the seats. I would not try that on purpose for sure as after I peeled Myself off the wheel and the lab off the dash I made a clip so I would not have a reccurence of that act. To say wheel hop would be a understatement! John" I was looking at some MCI the other day, these were passengers buses and on 2 of them the P brake was just behind the gear shift (on the aisle side) too close to the passengers, small metal boxes had been built around the P brake knob so that no one's bag/hand whatever could accidentally release it. My P brake is on the left side, but as I have rug rats I plan on building some kind of lockdown on it. (Message edited by zubzub on February 25, 2010) | ||
| Debbie and Joe Cannarozzi (Joe_camper)
Registered Member Username: Joe_camper Post Number: 229 Registered: 10-2006 Posted From: 99.23.128.182  Rating: N/A |
Thank you for that video | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1106 Registered: 11-2005 Posted From: 75.121.202.13  Rating: N/A |
In case you bnuts didn't notice, 60 KmPH is 36 MPH! | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1858 Registered: 10-2003 Posted From: 71.58.71.157  Rating: N/A |
Some of the less experienced should look at some of the other air brake videos also listed there. several can be very helpful to the novice and useful refreshers for the experienced among us. | ||
| George M. Todd (George_todd)
Registered Member Username: George_todd Post Number: 952 Registered: 8-2006 Posted From: 99.39.13.50 Rating: N/A |
John, Trying to compare an empty 10 wheel FRONT ENGINE tractor that has been made into a 6 wheeler, with a REAR ENGINE bus, is like trying to compare an alligator and a pig! (Both have tails, but one's a whole lot longer than the other!) If the engine were 3 to 6 feet behind the rear axle, (as in most buses we're talking about) instead of several feet in front of it, there wouldn't have been any hop. Jim, Look closely at BW's comment: "As far as the brake components know, whether you step on the pedal, or pull the knob, you are giving them a squeeze." That's all there is to it. The 30+ year old buses that are equipped with DD3s and the 100 pound pedal pressure release requirement are perfect testimony to the stability of brake systems. These drums, scams, etc are routinely suscepted to a full park/emergency application, AND a 100 pound pedal application to release the lock rollers! Your grease seal just decided it was time to leak... G | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1113 Registered: 11-2005 Posted From: 173.202.39.8 Rating: N/A |
That's what I like about you George, tenacity!! | ||
| Tom Christman (Tchristman)
Registered Member Username: Tchristman Post Number: 187 Registered: 1-2006 Posted From: 66.218.33.156 Rating: N/A |
I had an air line go in my big rig and with 4 axles of spring brakes, needless to say once the yellow button popped, I had about 5 seconds from 65mph to pull off the highway onto the shoulder. Everyone should try their emergency brakes just to see what they will do-preferably on a vacant road. Good Luck, TomC | ||
| Jack Conrad (Jackconrad)
Registered Member Username: Jackconrad Post Number: 1236 Registered: 12-2000 Posted From: 74.4.63.215 Rating: N/A |
First, let me say this is "Just My Way", YMMV. I have tested my parking brake while driving on a DRY, DESERTED, PAVED road at about 20 MPH. My DD3 parking brake applies 85 PSI to the drive axle brake chambers (normal braking is about 10-25 PSI,Hard "stand on the brakes" is about 75-80. It was a very quick stop that was easily controlled. Would I try this test on a wet or icy road? Absolutely NOT!. Jack | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1120 Registered: 11-2005 Posted From: 173.202.33.95 Rating: N/A |
Tom, I often wondered it this is the reason for those long black marks I often see on the interstates! You can always tell the ones caused by empties because of the skip marks. |
