The parking brake cable has a threaded end on it , Loosen the lock nut and turn it all the way in, This gives it the most play...then tighten back up so when you pull your parking brake lever it grabs, do it in stages, and test the brake. if it doesnt grab hard enough, then tighten more. Some remove the parking brake all together...... What year is your sled??? Some VMAX4 did not have hydraulic brakes...
OK 92 max4, just the cable adjust, I had the same sled. you should be ably to adjust the cable, If that doesnt work take the brake assembly apart, make sure everything is working smoothly, It has a little cup in there to take up the slack as the brake pads wear, Go thru everything......You will find it.