The latch that whirs but won't lock
Don't force the roof downHow owners describe it
The roof rises and folds normally, then hesitates a hand-span from the windscreen. The latch motor runs but the header rail never pulls down and locks. Warm afternoons make it worse, mornings often hide it. Some owners also notice the roof releasing more slowly at the start of a cycle. The latch cylinders are bleeding pressure through ageing seals: a gradual fault, until the day it isn't.
Why it gets misread
The instinct — pressing the roof down by hand while the latch fights — bends hardware machined to fine tolerances, and can leave the top neither open nor closed. Workshops that rarely see these systems quote a pump or a complete latch assembly on back-order, when the pattern we see is rebuildable cylinders inside otherwise sound hardware. An unlatched roof also isn't safe to drive at speed, so this fault deserves a phone call, not a workaround.
What we do
We pressure-test the latch circuit to confirm where it's bleeding down, rebuild the cylinders with new seals where the hardware allows — bench-tested before refitting — then flush, bleed and recalibrate. Latch alignment is checked so the rail lands square, and the roof is cycled and locked repeatedly before you collect the car. Hydraulic rebuilds are this workshop's signature service.