diff --git a/autobrake_test.p8 b/autobrake_test.p8
index b440ba4..4a0a218 100644
--- a/autobrake_test.p8
+++ b/autobrake_test.p8
@@ -177,10 +177,10 @@ function constraints:constrain(s, want)
 end
 
 function brake_dist(v0, brake_max)
- local tri_frames = v0\brake_max
+ local tri_frames = abs(v0\brake_max)
  local chunks = tri_frames * (tri_frames - 1) >> 1
  local chunk_zone = chunks * brake_max
- local overage = v0 - tri_frames * brake_max
+ local overage = abs(v0) - tri_frames * brake_max
  return (chunk_zone + overage * (tri_frames + 1)) * sgn(v0), (overage > 0) and tri_frames + 1 or tri_frames
 end