Max deployment speed is 90 knots. The brake is to be rigged to automatically close at 95 knots (and above). Rigging for this automatic closure is done per the landing brake plans. The 90 knot max speed with the brake down is per the VariEze Owner's Manual, Third Edition (Dec, 1979) on Page 7. This edition is available for download from this website as a scanned .pdf file.
-Joe Person
EAA Tech Counselor 4418
VariEze N79JN
Bothell, WA (KPAE)