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View Poll Results: what about your air bags
slow leak from air bags, live with it 3 30.00%
slow leak, trace leak and repair 4 40.00%
replaced air bags due to age 2 20.00%
replaced air bags due to failure 1 10.00%
Voters: 10. You may not vote on this poll

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Old 03-03-2014, 01:28 PM   #1
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air bags

it appears that the air bags will bleed down while sitting in the shop, i am new to diesel pushers and don't know if some leakage is normal
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Old 03-03-2014, 02:23 PM   #2
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Check the bags for cracks, if cracked they should be replaced. In theory you shouldn't have leakage. You might have stuck dump valves, some crud in the valve that keeps it from closing properly or seats that are not seating. You can remove them (there is one per corner) & clean them, re-install & check for continued leakage. You can do a search on this Alpine Forum for & you'll find stuff like post#58 on this Low Air Suspension thread, and a preliminary chassis air schematic at post#12 on this Parking Brake thread.
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Old 03-03-2014, 04:34 PM   #3
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At 12 years it is a good idea to replace the air bags anyway. Just like tires that you replace by age rather than wear it is hard to tell when one will fail.
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Old 03-03-2014, 06:47 PM   #4
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This might be a good topic for an impromptu survey: Has anyone replaced their air bags? If so, how old was your coach when you replaced them. Has anyone experienced a catastrophic bag failure?
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Old 03-03-2014, 07:44 PM   #5
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Wrong ride height level will also cause leakage. At least it did on my rig
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Old 03-04-2014, 04:32 PM   #6
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Hi John

When you replaced your airbags did you notice a difference in the ride quality...not so much from a possible leaking bag but just from them being "old" and sagging ?

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Old 03-04-2014, 05:58 PM   #7
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Quote:
Originally Posted by alpinedrvr View Post
Hi John

When you replaced your airbags did you notice a difference in the ride quality...not so much from a possible leaking bag but just from them being "old" and sagging ?

Geoff
No. There is no difference.
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Old 03-04-2014, 07:17 PM   #8
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Thanks
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Old 03-17-2014, 05:49 PM   #9
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Since my coach is 14 years old and the bags are showing signs of cracking I will be replacing them soon along with new tires and break lines. After much searching I have figured out the part numbers for my 36' 2000 Alpine. I keep these part numbers handy in case a bag blows on a trip so I can tell the repair person which bag to bring.

Firestone air suspension
Front W01-358-9039
Rear W01- 358-9482

The correct air spring for the AD-200-7 rear suspension used on early coaches is safholland (Neway) 90557161, Triangle 8492, Firestone W01-358-9482.
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Old 03-17-2014, 05:55 PM   #10
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I assume by "searching" you mean reading previous threads on this subject.
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Old 03-17-2014, 11:05 PM   #11
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There were no previous threads covering the air springs used on my model year of alpine. It required figuring out what the make and model of my suspension was then looking at the manufacturer's documentation to see what air springs are specified for the suspension. I posted the information to help others.
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Old 03-18-2014, 08:02 AM   #12
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I was confused because you posted the same info in October last year and included info I had posted previously. Sumptercat has an '02 38 so this info may not be accurate for his coach.
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Old 03-19-2014, 12:55 AM   #13
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I found the slow leaks were from the pluming to the air bags and not air bags so I live with it.
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Old 03-19-2014, 08:20 AM   #14
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There are so many connections in the air system it is not surprising there are leaks somewhere. The rear air bags on mine are connected via a 90 degree swivel and the "O" ring on these wear. Just by touching them I could get air to leak so I replaced both.
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