| Author |
Message |
Richard Ligon
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 5:09 am: | |
The last trip we took we drove through a hurricane on the way home. Heavy rains.....
The bus has been sitting for 2 months, when I went to move it, the brakes would not release.
Any ideas on how to break them loose?
Thanks in advance
Richard |
John Rigbyj
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 7:57 am: | |
What type of bus??
I had that happen on my 4104, only stood for two days, It was a blown diafram in one of the air regulators, in the compartment under the drivers seat.
John |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 8:06 am: | |
I don't think it's rust...like John said ,it's a diafram ,or a valve,....build up to 120 air pressure,try to release brakes,listen for air leaks.. |
Don/TX
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 9:23 am: | |
Make SURE you have enough pressure built up. My 4905 would occasionally do that, it seems you need as much or more pressure than you had when you set the brakes. Once I put shop air on it, they came right loose. (We are assuming that you still have the original DD3 type brakes of course.) |
John Rigbyj
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 4:45 pm: | |
Two dogs were did you get rust from???He doent have an Eagle HA. HA.
John |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 5:02 pm: | |
IT'S WHERE...not were
he was talking about rain like it had something to do with it |
Jayrjay
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 10:03 pm: | |
If you still have DD3 chambers, crawl underneath with a hammer, and knock the lock bars off the actuator rods. This will release the rear brakes so you can move it. Remember that this an EMERGENCY movement procedure, and that you will have NO rear brakes, so use caution. Then you can apply air pressure with a service brake application and see if the actuator rods are moving or frozen. Check your '05 manual for more on this procedure (You DO have a manual don't you?) Cheers...JJ |
Don/TX
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 07, 2004 - 10:23 pm: | |
The lock thing was an extra according to my manual, mine came without them, but I put them on for just such occasions. Anyhow, you may or may not have them. |
John Rigbyj
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 6:14 pm: | |
Richard,
I think you are having a problem with the old ICC cicuit, the diaphram in the air value feeding the ICC system. You can tell by feeling around the valve, if its bad it looses air though a tiny hole right above the diaphram in the body of the valve.
John |
Don/TX
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 7:14 pm: | |
I didn't think a 4905 ever used the ICC circuit John. |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 7:46 pm: | |
cicuit don...you know...think it's a fruit |
John Rigbyj
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 7:51 pm: | |
Your right Don, they only came on the older GM,S and those rusty old E,s
John |
Mike Eades (Mike4905)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 8:00 pm: | |
I have an emergency valve on the left side on what was the drivers panel. Mine still works. If I need to release my brakes I can overide the system. I can move the bus this way to get to shop air. Hope htis helps. Mike4905 |
Don/TX
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 08, 2004 - 8:54 pm: | |
Interesting Mike, what year is yours? Does your manual show it? To over ride a DD3 would be an interesting routing of air. Is it labeled ICC or something like that? Anybody else got one of those on a 4905? |
Brian Brown (Fishbowlbrian)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 09, 2004 - 11:50 am: | |
My DD3 nightmare on my previous bus, a '74 MC8, involved replacing the aux. diaphragm in one of the cans. A broken seal had let water and road debris in the can and trashed the inside of it, allowing the service side air into the parking/ emergency side. A frustrating several days of troubleshooting, then about $100 worth of replacement parts from Mohawk and another few days of wrench-turning fixed it to get that bucket of rust back on the road.
If you can trace down a reliable air schematic for your system it will help. The DD3s have a lock port that requires 85 psi or better to overcome the wedges to free the rods, and a leaking seal, valve or regulator on that side of the system will prevent them from releasing. Your ears will be your best bet of detecting leaks, and if you can air up the system with a distant or intermittent air compressor rather than the engine… all the better.
I can dig around for some of the bits of literature and advice I collected while struggling with mine, if you’d like.
You can always back the shoes off the drums with the slack adjusters, but I’d caution you to NOT move the bus, because she won’t stop well at all (been there) and you’ll be relying on the smaller fronts and tag brakes to stop and they aren’t up to much more than slow, rolling stops (done that). Whatever you do, make sure it’s chocked and tight and up in the air, because you can seriously die under there if it rolls or an airbag gives out.
Keep us posted,
Fishbowl Brian |
Mike Eades (Mike4905)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 10, 2004 - 11:38 am: | |
Don I can't answer that because all I have is a wood grain dash and all the labels are gone. One of Luke's guys show me what it was for because I was going to take it out and was told not to. My coach is a 1975. My # is pmb8a1051. I haven't look at the book because I usally let Luke an his gang do my work unless I brake down on the road. I wolud ask Luke what valve I am talking about. Mike |