[HPsquared]

Early brake discs were often maintenance nightmares. Discs built into the hub (so you need to disassemble wheel bearings to take the discs off) or even worse, Jaguar's inboard rear discs (reduced unsprung mass, but you needed to remove the driveshafts and they were buried in the middle of the car). Lots of premature optimization went on.

[joncrane]

As a semi-retired mechanic I still remember having to re-pack wheel bearings for brake jobs, what a nightmare.