T4 shock absorber membrane swelling

Cipop · **Posted:** Sat Mar 09, 2013 21:40:12

Hello,

I have (had) a problem with adjusting rebound on shocks on my T4.
When I adjusted rebound, air somehow got inside of shocks and they started squeaking.

Then I searched on the xray forum little bit, and stumbled upon a post that shock membranes can swell and increase their size over time.

So I compared old and new membranes and found that used ones were little bigger (see picture) swelled, and much softer.

I've changed membranes and adjusting rebound was child easy.

So If anybody has same truble.....check your membranes and compare them to new ones.

File comment: Used vs. New

DSC05851-mere.jpg [ 126.64 KiB | Viewed 2935 times ]

Skiddins · **Posted:** Sat Mar 09, 2013 23:02:25

Maybe it's the oil you're using?

Cipop · **Posted:** Sat Mar 09, 2013 23:09:15

I'm using robitronic's oil :shock:

Hagberg · **Posted:** Mon Mar 11, 2013 18:16:45

Yes, they will swell after some time. This is normal when they come in contact with silicone oil. You have to compensate for this when building the shocks, by pushing out the excess oil from the shock, by pushing on top of the membrane, using a screwdriver or something similar, if you are aiming to use a small amount of rebound.

Tak · **Joined:** Sun Mar 24, 2013 16:46:14 **Posts:** 31

Hi.

How often do you have to chage shock membranes, because I am having trouble setting rebound?

Cipop · **Posted:** Sat May 25, 2013 15:14:03

I was using these shock with the same oil and membranes for whole season.
But if I would disassemble the shocks sooner I would probably have problem re-setting rebound.

Skiddins · **Posted:** Sat May 25, 2013 16:35:49

You don't get the swelling if you use Xray oil

spotlessdragon · **Joined:** Fri Dec 07, 2012 09:52:35 **Posts:** 91

i use much more oil and no swelling either

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T4 shock absorber membrane swelling

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