I have a Prodigy P2 and my brakes don't lock up. I'm sure they are in need of adjustment because I have not had them apart yet. On the highway I run mine on as high as they go, 12 with no boost. Seems to work well and no lockup. I had an emergency stop at over 70mph with my abs engaging because the cars in front of me slammed their brakes. I must say my rig stopped on a dime, I couldn't even tell I had the loaded down trailer behind me. The guy behind me with his F350 and triple axle fifth wheel had to bail to the dirt median, luckily it was their or my rig would have been toast.
On city driving I cut it back to about 7 or 8 to smooth it out. Also on steep declines I cut it back because the trailer brakes seem to heat up really quickly compared to my truck brakes.
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