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Author Topic: What may cause the rear suspension drop intermittently?  (Read 298 times)

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July 20, 2018, 08:13:12 AM

celica

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What may cause the rear suspension drop intermittently?
« on: July 20, 2018, 08:13:12 AM »
I changed the rear air bag suspension two years ago as the rear was always sagging overnight

Now it’s sometimes on rear left

Can it be air bag suspension again, other?

I don’t understand as it’s sometimes. It rises back up after a short drive

July 20, 2018, 08:48:40 PM
Reply #1

marti

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Re: What may cause the rear suspension drop intermittently?
« Reply #1 on: July 20, 2018, 08:48:40 PM »
You must have leak.....

July 22, 2018, 12:05:12 AM
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celica

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Re: What may cause the rear suspension drop intermittently?
« Reply #2 on: July 22, 2018, 12:05:12 AM »
I do have a leak

I’ve heard a hissing noise when it drops which is sometimes when parked up

What could it be?

Assume not fault air bags as if it’s worn like the old ones it would always leak

I’m confused to understand what it could be?

July 22, 2018, 09:31:52 AM
Reply #3

X5Sport

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Re: What may cause the rear suspension drop intermittently?
« Reply #3 on: July 22, 2018, 09:31:52 AM »
Could be bags, hoses, valve block, connections in pipes etc.
:type: Never anthropomorphise computers. They hate that.

July 22, 2018, 10:01:15 AM
Reply #4

celica

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Re: What may cause the rear suspension drop intermittently?
« Reply #4 on: July 22, 2018, 10:01:15 AM »
Could be bags, hoses, valve block, connections in pipes etc.

Thanks

But what would cause intermittent leakage?

My old bags I saw perished and so leakage was always happening over time

But this is only sometimes?

Getting oil change next week so will get garage to diagnose

July 22, 2018, 10:04:28 AM
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X5Sport

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Re: What may cause the rear suspension drop intermittently?
« Reply #5 on: July 22, 2018, 10:04:28 AM »
It could be temperature or load related.  Something causing a hose to move slightly and give rise to a leak, or a seal/valve being affected by higher temperatures.  A bag may have gone bad again but needs to be at the right angle for it to leak.

Even the difference between a full and empty fuel tank might be enough.
:type: Never anthropomorphise computers. They hate that.

July 28, 2018, 11:24:10 AM
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celica

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Re: What may cause the rear suspension drop intermittently?
« Reply #6 on: July 28, 2018, 11:24:10 AM »
Just been for an oil service

The garage had a look and couldn’t see anything obvious

It’s annoying as couldn’t replicate the drop

Yet even on a flat at a car park the other day it dropped

Could it be electrical? Could it be the heat we’ve had?
I heard an apparent hissing noise of air leakage before but strange how it’s intermittent

Not sure whether to throw money and put on a new air bag

July 29, 2018, 03:32:34 PM
Reply #7

celica

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Re: What may cause the rear suspension drop intermittently?
« Reply #7 on: July 29, 2018, 03:32:34 PM »
I think for the price I’m going to purchase Aerosus airbag and a solenoid valve blockas it’s free returns and take it to my trusted mechanic to inspect and at least have options to change parts if required