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Old 12-18-2015, 10:26 AM   #1
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Air brakes

I am a new member, and just feeling my way around the forum. Have enjoyed visiting in the past and am enlightened by what i read. I now have a situation that confuses me, and thought i would ask if any one has i idea as to what went on. I have a Holiday Rambler, endeavor, 40PDT. Recently i was faced with an emergency stop, due to someone with a death wish. I came down on the brakes hard and fast, and just as i was to a stop, the pedal seemed to go to the floor, and the coach seemed to continue a few more feet. The brakes have always worked well, but this was the first time for a panic stop. What am i missing here? Normal? Problem? I have not powered it up to listen for air leaks, but it will sit in the garage for days without the air leaking off. Then sometimes in about 5 days the rear will start to sag. Any thoughts? Have had air brakes since 1999.
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Old 12-18-2015, 10:52 AM   #2
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Originally Posted by ramlin View Post
I am a new member, and just feeling my way around the forum. Have enjoyed visiting in the past and am enlightened by what i read. I now have a situation that confuses me, and thought i would ask if any one has i idea as to what went on. I have a Holiday Rambler, endeavor, 40PDT. Recently i was faced with an emergency stop, due to someone with a death wish. I came down on the brakes hard and fast, and just as i was to a stop, the pedal seemed to go to the floor, and the coach seemed to continue a few more feet. The brakes have always worked well, but this was the first time for a panic stop. What am i missing here? Normal? Problem? I have not powered it up to listen for air leaks, but it will sit in the garage for days without the air leaking off. Then sometimes in about 5 days the rear will start to sag. Any thoughts? Have had air brakes since 1999.

There is no direct mechanical connection between your brake petal and the air that actuates the brakes. There is a resistance block for want of a better term that provides brake pressure feel. I'm guessing that you had reached the max brake application or the ABS kicked in & was responsible for what you felt.
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Old 12-18-2015, 12:58 PM   #3
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Welcome to IRV2! We're sure glad you joined us!

If the ABS kicked in you would have felt a rather harsh "jerking" as the brakes were applied and released in a very fast sequence! I had that happen a short time ago and it scared me because I didn't know what it was at the time! Not sure what you experienced, but I would get it checked out with a good truck shop ASAP!

Good luck, happy trails, and God bless!
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Old 12-18-2015, 01:54 PM   #4
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Air Brakes

Thanks for the responses. After Christmas i will take the unit out and when i can will see if the event repeats itself. I too thought maybe the abs was kicking in, but no shuddering or pulsating like you get in a car. We love the unit. Its our 3rd H/R. The second diesel. Will also try to listen for air leaks once we air up to get back on the road.
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Old 12-18-2015, 02:02 PM   #5
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There is no direct mechanical connection between your brake petal and the air that actuates the brakes. There is a resistance block for want of a better term that provides brake pressure feel. I'm guessing that you had reached the max brake application or the ABS kicked in & was responsible for what you felt.
Interesting! Now I need to research this a bit more. Still not to old to learn a thing or two!
Thanks
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Old 12-18-2015, 02:02 PM   #6
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I doubt you will hear air leaks unless they are huge leaks, but a simple soap solution to spray around the fittings will find the small ones.
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Old 12-18-2015, 03:05 PM   #7
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Air Brakes.

Thanks for the help. Wish i had that 38 COE.
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Old 12-18-2015, 03:58 PM   #8
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ABS air brakes rapidly exhaust air, unlike hyd. brakes.

I believe you would hear it more the feel it.

An air brake pedal is a control for stored air pressure, again unlike hyd brakes that rely on your foot, with power assist, for the pressure.

It's like opening your kitchen faucet, it doesn't get harder the more you turn it.
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Old 12-18-2015, 06:58 PM   #9
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