lin loc

[72swinger]

im having a problem with my lin-loc at the race track ,but in the drive way at home it seems to work fine.after my burnout i release the button and it is still locked up .have to hit brakes a few times to get it to roll .lin-loc is old so i thought i would try that first but not sure if my brakes are the problem.i have a wilwood or mopar performance master but the car has 4 wheel drum right now.not sure if the pressure is bleeding off quick enough. was wondering if any one has run in to this before       going to put wilwood brakes on during the winter but want to race a couple of times before..   finally got it painted after 8 years of work and want to show it off       thanks