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Author Topic: First Problem with my Bus..  (Read 4135 times)
Highway Yacht
*****Jimmy*****
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« on: September 13, 2010, 12:36:47 PM »

I've got an MCI that I purchased a couple weeks ago. I just noticed it doing something that it shouldn't be doing. The spot I park my bus on is on a slight incline. I've noticed twice that I've parked my bus and when I returned to it the next day, it had rolled 10 to 12 feet. The other time it appeared to have rolled close to 20 feet. I know for a fact that the Park Brakes were applied when it was parked. Also it stops while still on the incline so that leads me to believe when the Park Brakes malfunction that it is only for a few seconds before the brakes re-apply since it doesn't roll all the way to the bottom of the incline. I can hear a small air leak in the Park Brake valve when I shut the engine down so I'm wondering if that is where the trouble is. The bus does have other air leaks too but they don't seem any worse than most other buses. Does the air pressure hold the bus in place until it leaks down low enough for the spring brakes to hold???  Here is a picture of the incline my bus is parked on. That incline goes for approximately 200 ft but so far about 20 feet is the furtherest it has rolled.  Any ideas or advice??

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1979 MC-9  8V71-Turbo / HT740             * www.MciBusTalk.com *
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luvrbus
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« Reply #1 on: September 13, 2010, 12:43:44 PM »

Adjust your brakes and grease the DD-3 good then you will be fine,they get full of dirt and rust over the years and balls on the ratchets locks don't work to lock you probably just have one side holding



good luck
« Last Edit: September 13, 2010, 01:03:38 PM by luvrbus » Logged

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steve wardwell
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« Reply #2 on: September 13, 2010, 12:49:09 PM »

that at the very least has to be nerve racking......put some shock blocks 6'' in front of wheels (after fixing) to keep tabs on it
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Sometimes the more I think about something the less I think about something.    As soon as I save a little money my bus finds out.                                      Why grab a plane when you can take the bus ?                         If I'm wrong 10% of the time how can the "Queen" be right 100%
jordansinthesky
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« Reply #3 on: September 13, 2010, 01:56:10 PM »

One should always use chocks when parking on an incline correct?
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1957 PD4104.  Self proclaimed youngest busnut in the nation.
FloridaCliff
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« Reply #4 on: September 13, 2010, 05:05:49 PM »

The bus does have other air leaks too but they don't seem any worse than most other buses. Does the air pressure hold the bus in place until it leaks down low enough for the spring brakes to hold??? 

The air releases the brakes, they should hold regardless of whether you have air or not.

Clifford gives sage advice.

Cliff (the other Cliff)
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1975 GMC  P8M4905A-1160    North Central Florida

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FloridaCliff
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« Reply #5 on: September 13, 2010, 05:07:04 PM »

One should always use chocks when parking on an incline correct?

I would, but then again, I don't like searching for the coach..... Grin

Cliff
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1975 GMC  P8M4905A-1160    North Central Florida

"There are basically two types of people. People who accomplish things, and people who claim to have accomplished things. The first group is less crowded."
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Chopper Scott
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« Reply #6 on: September 13, 2010, 05:26:06 PM »

I have a set of chock blocks (sp) but I use them to tie the dog's leash to! Grin In your case I think  that maybe a wise idea. But anytime you get any advise from Clifford it is gold.
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gumpy
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« Reply #7 on: September 13, 2010, 05:34:07 PM »

Maybe it's just me, but I think if I parked my bus on an incline and it moved by itself, I wouldn't park it on the incline a second time without figuring out what the problem is and fixing it.

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Craig Shepard
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rv_safetyman
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« Reply #8 on: September 13, 2010, 06:57:42 PM »

That looks like a fairly new MCI.  Do the newer MCIs have DD3 or spring brakes?

If spring brakes, I would suspect some brakes that are quite a ways out of adjustment.  As was noted, an air leak would not affect the parking side of the spring brakes.

Jim
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Jim Shepherd
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gumpy
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« Reply #9 on: September 13, 2010, 07:01:12 PM »

That looks like a fairly new MCI.  Do the newer MCIs have DD3 or spring brakes?

Looks like an MC9 with a paint job and maybe some updated fiberglass.

DD3s. Probably needing adjustment and/or grease. Possibly in need of diaphragms.
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Craig Shepard
Located in Minnesquito

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Busted Knuckle
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« Reply #10 on: September 13, 2010, 07:11:51 PM »

That looks like a fairly new MCI.  Do the newer MCIs have DD3 or spring brakes?

If spring brakes, I would suspect some brakes that are quite a ways out of adjustment.  As was noted, an air leak would not affect the parking side of the spring brakes.

Jim

Jim I have some buses for sale! Wink

As all have said the DD3's will rust up with out proper maintenance. Take Clifford's advice and use it! (Clifford's advice is like $ in the bank!)
Grin  BK  Grin
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Busted Knuckle aka Bryce Gaston
KY Lakeside Travel's Busted Knuckle Garage
Huntingdon, TN 12 minutes N of I-40 @ exit 108
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Grin Keep SMILING it makes people wonder what yer up to! Grin (at least thats what momma always told me! Grin)
Hcklbery
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« Reply #11 on: September 13, 2010, 09:53:41 PM »

Well if ALL ELSE fails than tell the wife or kids or both Smiley
to stop farting around with your sanity. SmileySmileySmiley

(of course this depends on how long you've been a BUSNUT as sanity may not apply leaving you stuck at the farting part of your admonishment creating a whole new set of problems). Wink Wink Wink
 Grin Grin Grin

JUST SAYING !!!
 Cheesy Cheesy Cheesy
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This is a 64 4106 4 sp shft 8v71/Appreciate ANY advice/info. A complete Novice.
Hcklbery
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« Reply #12 on: September 13, 2010, 09:56:44 PM »

I can hear ya now.

"AHH CUT IT OUT"

LOL

 Grin Grin Grin
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This is a 64 4106 4 sp shft 8v71/Appreciate ANY advice/info. A complete Novice.
Stolaas
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« Reply #13 on: September 13, 2010, 10:06:55 PM »

I park mine on a serious incline with problems. I'm in a covenant neighborhood...

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niles500
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« Reply #14 on: September 13, 2010, 11:53:47 PM »

Definitely sounds like your slack adjusters aren't  Cheesy
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