Line lock or leave as is?

demon322 said

I had the same concerns and I know you mentioned this on the original thread also
Brakes won’t ‘hold’
I may have misunderstood but I thought the consensus there was that my brakes seemed to be working fine for normal braking but not burnouts (which they aren’t designed to do anyway.) Admittedly I know very little about line locks but by locking the front only would that then free the rears to spin with no rear brakes applied? Again. I may be off base here.

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If the car is trying to roll with all four brakes on it would makes sense that only the fronts being on won't hold it either.
Once the tires are spinning the line lock should hold it though, and if your tires are in a water box they should spin pretty easy anyway.
I can't imagine your car can't light the tires right off, so maybe you are easing into the throttle too much instead of just nailing it a bit harder to break them loose more suddenly so it doesn't get a chance to push through the brakes.