Author |
Message |
DAVID HEAD (Chuck)
Rating: Votes: 1 (Vote!) | Posted on Friday, April 08, 2005 - 4:34 pm: | |
moved the bus today first time this year. The air brakes worked fine when I moved first time. Then the second time I tried to move it the air brakes would not come off. I tried pushing the knob in and out several times. Anybody else ever have this problem and if so what did you do to fix it. |
DAVID HEAD (Chuck)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 4:34 pm: | |
should have said it is an mc9 |
Jack Conrad (Jackconrad)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 5:07 pm: | |
First, make sure the bus is aired up to at least 100 PSI. Push down the parking brake knob. Depress the service brake pedal firmly and hold for 5-8 seconds. Release brake pedal, brakes should be released. This is per the instructions on the side panel of our MC-8. If they still do not release, repeat above procedure. It is possible that the rollers that lock the parking brake in the DD3 have rusted up. Hope this helps, Jack |
Don/TX
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 6:41 pm: | |
And don't forget, you have to have plenty of air pressure when trying to release, did you wait for full pressure? |
DAVID HEAD (Chuck)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 8:02 pm: | |
If the air pressure only gets to ninety pounds how do I get more air. |
John Jewett (Jayjay)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 8:37 pm: | |
Use a soap solution and start checking air line joints and hoses for a leak. If it's a biggie you may be able to hear it. Rusted,leakey air-beams? Stuck governor (near the compressor), leaking head gasket on the compressor, and/or about twenty other things and places to look for. Just keep at it and most likely you will find one and perhaps even more leaks. It's a tough one, and perseverance helps. ...JJ |
Don/TX
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 8:40 pm: | |
Shop air! I used to have that problem with mine, I would routinely keep 135lbs shop air on it, and if I tried to release with engine air around 110, they would not release. I would have to hook up shop air again to release them. It seems you have to have the same or higher pressure to release, as you had to set them. Try it, they are not even supposed to release at 90 as I recall. |
DAVID HEAD (Chuck)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 8:57 pm: | |
for some reason the air pressure has now gone over one hundred and ten and the the thing works again . must have been still sleeping after the long winter.Thanks for all your help we are ready to roll |
Buswarrior (Buswarrior)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 9:07 pm: | |
Hello David. You have an air system problem, not an air brake problem. Find the leak, or leaks, and repair it, and I'll suggest the parking brake will return to proper functioning. If you can't get more than 90 lbs of air, you have a leak somewhere. Are you seeing the air builds well to 90 and stops? I'd be expecting to find the problem in something other than the brakes. The pressure protection valve opens in the 90 lb neighbourhood to fill the accessory side. If it is poor at climbing to 90 as well as stopping there, the brake valves are your likely culprit. Try to aggressively pump the brakes and manipulate the parking brake control in an attempt to blow any dirt that may be stuck in an exhaust port seal. For my money, since the coach has been sitting for awhile, it might be a combination of a lot of small leaking, it might be something made of rubber, or some dirt stuck in the exhaust seal of a valve. On the soft bits side: seal in a valve, diaphragm in a pressure regulator, suspension bellow, ride height valve, wipers/washers, air rams in the engine room: belt tensioners, shutter and damper rams. If the problem goes away by itself, it will be dirt, or sticky moving internals of a valve. This is one reason to consider a systematic replacment or rebuild of all the air system valves. We don't know how long some of these valves have been in service, or how poluted the air system was allowed to get earlier in its life. As noted in the other posts, get out and listen. Attching shop air to the connection in the engine room would be helpful for keeping the engine turned off to hear better. happy coaching! buswarrior |
Buswarrior (Buswarrior)
Rating: N/A Votes: 0 (Vote!) | Posted on Friday, April 08, 2005 - 9:14 pm: | |
Hello David Where are you, I'm in Toronto. e-mail direct if you like. Click on my name in blue to find the e-mail. happy coaching! buswarrior |
TWODOGS (Twodogs)
Rating: N/A Votes: 0 (Vote!) | Posted on Saturday, April 09, 2005 - 6:25 pm: | |
brake can rods need oiling !! AND...I keep harping on this ...the D-2 air govenor needs to be disasembled and cleaned & re-assembled evey 20,000 miles (OR),,,every year...they do not wear out...but get gummed-up with dirt...HEY guys...please...the air govener is bolted to the side of the air compressor & NEEDS MAINTENANCE.... |
john rowlands
Rating: N/A Votes: 0 (Vote!) | Posted on Saturday, April 09, 2005 - 7:42 pm: | |
tredle valve sticking (brake pedal) spray wd40 down by brake pedal on air valve ! |