| Author | Message | ||
| dutch (Dutch)
Registered Member Username: Dutch Post Number: 27 Registered: 2-2007 Posted From: 216.9.250.62 Rating: N/A |
Hello fellow nuts As I was driving my amazing great gm bus I noticed at a light with a small decline that when I press the brakes the front right side makes a loud hissing noise,kinda like that there is air releasing. The aipressure meter on the dashboard goes from 120 to 80 and even lower if I keep pressing it harder once I release the break it goes back to 110-130 psi very quickly. Could it be a hole in the airbrakeline?? Dutch | ||
| Len Silva (Lsilva)
Registered Member Username: Lsilva Post Number: 99 Registered: 12-2000 Posted From: 71.31.104.140 Rating: N/A |
Very definitely yes. Sounds like you have a leak in a front brake. Most likely a diaphram, maybe just a hose. Don't delay checking it out. Len | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1213 Registered: 12-2000 Posted From: 71.195.112.181 Rating: N/A |
Dutch - Len's right, you've got an air leak up front. It may be the RF, but it also may be elsewhere. Hissing noises tend to travel in weird ways. Time to get out the spray bottle of soapy water! Whatever you do, DON'T crawl under your bus without supporting the body with jack stands, run-up ramps or wooden cribbing. If you were to lose all the air in the suspension, there's not enough room under there for you, unless you want to be a pancake. Work SAFE!! FWIW & HTH. . .  | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 58 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
Dutch, move the bus away from the spot you drained the toilet first! Get a friend to help. Start your coach and build the air. Make the coach safe for you to slide underneath the wheel area loosing the air. Get under the coach and have your friend push the brake pedal down part way so you can find the leak. If you can hear the air and it narrows down to a 4 inch round device with a small hole in the cover its a blown rubber diaphram. Use a 9/16 wrench to take the clamp off the outside and inside you will find a rubber pancake looking piece called a brake diaphram. Take it out and replace it with a new one the same exact size. Buy 3 diaphrams if thats the problem, ($15). Change both fronts and throw the spare in your new tool box. If you broke a fitting, commercial air brake fittings on older equiptment look like brass fittings they sell at the hardware store and they will fit. DOT approved fittings are more expensive and have added strength in critical areas to protect against vibration and road debris. If you have a broken fitting you can make an educated purchase for a replacement. The hardware store stuff will always get you out of a jam but I don't think you are supposed to use it. If its a hose there are two possibilities,(1) glad hand hose and (2) Aeroquip braided steel line. Take yours of and head to your favorite hose outlet. If you have a diaphram problem on the front, I think you need to think about taking a look at the rear brake cans sometime soon. You are safe if with the brakes released you can hold the pedal to the floor for 30 seconds and you have no leaks, with DD3s. With maxi cans an additional test is required and you are safe if there is no air loss with the brakes released and not applied. This is very important. I was only kidding about the toilet! I last spoke to you 50 miles south of Martinsville and I'm sending you a flashlite! | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 59 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
Dutch, move the bus away from the spot you drained the toilet first! Get a friend to help. Start your coach and build the air. Make the coach safe for you to slide underneath the wheel area loosing the air. Get under the coach and have your friend push the brake pedal down part way so you can find the leak. If you can hear the air and it narrows down to a 4 inch round device with a small hole in the cover its a blown rubber diaphram. Use a 9/16 wrench to take the clamp off the outside and inside you will find a rubber pancake looking piece called a brake diaphram. Take it out and replace it with a new one the same exact size. Buy 3 diaphrams if thats the problem, ($15). Change both fronts and throw the spare in your new tool box. If you broke a fitting, commercial air brake fittings on older equiptment look like brass fittings they sell at the hardware store and they will fit. DOT approved fittings are more expensive and have added strength in critical areas to protect against vibration and road debris. If you have a broken fitting you can make an educated purchase for a replacement. The hardware store stuff will always get you out of a jam but I don't think you are supposed to use it. If its a hose there are two possibilities,(1) glad hand hose and (2) Aeroquip braided steel line. Take yours of and head to your favorite hose outlet. If you have a diaphram problem on the front, I think you need to think about taking a look at the rear brake cans sometime soon. You are safe if with the brakes released you can hold the pedal to the floor for 30 seconds and you have no leaks, with DD3s. With maxi cans an additional test is required and you are safe if there is no air loss with the brakes released and not applied. This is very important. I was only kidding about the toilet! I last spoke to you 50 miles south of Martinsville and I'm sending you a flashlite! | ||
| dutch (Dutch)
Registered Member Username: Dutch Post Number: 28 Registered: 2-2007 Posted From: 66.68.98.151 Rating: N/A |
he guys thanks wierd thing is it is still doing it but now way i mean wayyy less than before. i will have it checked out very very soon | ||
| John Harrelson (Jharl)
Registered Member Username: Jharl Post Number: 41 Registered: 7-2005 Posted From: 72.87.63.213 Rating: N/A |
I did not read every thing in this post but have a nice tip. leave the bus off and build air with an remote air compressor far away from thebus asyou can to help it be uit around the bus so that you can hear the air leaks. |