Originally posted by ziggy12345
If you have air in the shock it will rebound and it should not do this.
The little rubber element compensates for the increase in volume due to the shock shaft entering the chamber.
There is air on the other side of the element and this should be allowed to escape so i usually drill a small hole in the top of the shock mount for this
I have to disagree with you on the air causing the rebound. It seems to be caused by building the shock with pressure in it. If you fill the shock to the very top, set the bladder on top lightly and screw on the top, you will get a lot of rebound. Thats because more oil is getting trapped under the bladder. If you press the bladder down allowing the excess oil to escape before screwing the top on, you will get very little rebound. I have done it both ways and I have checked for air and found none.