This is a highly pressurized negative chamber, that did not depressurize when deflating the shock. Couple things can cause this. One deflating a shock to fast- There is a air valve that syncs the positive and negative champers at 10-15% of a shocks stroke(may be more or less depending on model brand and length of shock).Best practice for deflating a shock is to let air out slowly using the bleed valve from a shock pump and cycle the shack every 20 psi or so to equalize negative with positive so they deflate completely and you dont endup with shock suck down like this.
Another thing that can cause this is a clogged negative air valve or a damage negative air and compression seal. For most times when you have shock suck down putting shock in bike or a shock dyno, inflating it cycling it and slowly releasing pressure will fix it and then can be opened safely.
NOTE-NEVER OPEN A SHOCK WITH SUCK DOWN, they can be extremely dangerous,. you have no way of knowing if thats 30-50 psi which will just be a light pop when the air cone comes off, or a few hundred which can shoot the air can at high velocity(also not it is best practice to wrap a towel around base of shock when opening air can. I stick a 10mm allen through eyelet the figure 8 wrap a towel around that, so that if the air can pop it cant go any where and hits a soft towel. KEEP FINGER AWAY FROM BASE.
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This is a highly pressurized negative chamber, that did not depressurize when deflating the shock. Couple things can cause this. One deflating a shock to fast- There is a air valve that syncs the positive and negative champers at 10-15% of a shocks stroke(may be more or less depending on model brand and length of shock).Best practice for deflating a shock is to let air out slowly using the bleed valve from a shock pump and cycle the shack every 20 psi or so to equalize negative with positive so they deflate completely and you dont endup with shock suck down like this.
Another thing that can cause this is a clogged negative air valve or a damage negative air and compression seal. For most times when you have shock suck down putting shock in bike or a shock dyno, inflating it cycling it and slowly releasing pressure will fix it and then can be opened safely.
NOTE-NEVER OPEN A SHOCK WITH SUCK DOWN, they can be extremely dangerous,. you have no way of knowing if thats 30-50 psi which will just be a light pop when the air cone comes off, or a few hundred which can shoot the air can at high velocity(also not it is best practice to wrap a towel around base of shock when opening air can. I stick a 10mm allen through eyelet the figure 8 wrap a towel around that, so that if the air can pop it cant go any where and hits a soft towel. KEEP FINGER AWAY FROM BASE.