[jumpingjack66]

DON'T GET ME STARTED ABOUT MY 2000 SIVERADO. Your 4.3 v-6 alone does not have the mass to stop your truck and trailer from rolling back on a boat ramp, especiaally with the non-existant GM parking brake system, i believe your parking brake was just gradually losing strength and grip and now its at that common GM condition of perfectly usless.. sugest you use a wheel chock with a rope on it so you can jerk it out wile in the truck or punt and have your emergency brakes serviced.. a 300 dollar job minimum as the parts in the inside drum becom unusable and the dealer will not warrenty the work unless you replace roters.. compression i don't believe would help you even if your moter was new..again a v-6 does not have the internal mass, for that matter my 4.8 v-8 would not have it either. I have hade to replace my parking brake twice in a 12 month period..and the secound time it failed , rolled across a parkin lot (luckily not killing anyone) and hit a toyota. I wish i had bought a toyota....or anyhting besides this pos. I'm going to get an attorney now and go for a lemon law settlement as gm has no intension of fixing this truck and its factory defects..i've only talked about my brakes because if i go further into this letter i will suffer complete anxiety overload.. good luck... JJ P.S. have you tried putting it in 4 wheel low on the boat ramp you may get it to hold in a much much lower gear.