Not recommended, but anything is possible. You would be best to approach a
hot-rod club, where many people make up their own suspensions and disc brake
systems. But why ?
This sort of exercise is riddled with pitfalls. For a start, caliper sizing to
suit the mechanical rear brakes would be a nightmare, and the mechanical servo
system would need extensive balancing and tuning, unless you fit a vacuum servo
and hydraulic rear brakes. That would open even more problems. The suspension
would need at least some radical modification to accommodate discs and calipers.
I know of an R-Type once owned by the managing director of REPCO in Melbourne
which was converted to hydraulic rear brakes and vacuum servo. Really, my
R-Type stops better. I must say that the R-Type brakes perform at least as well
as most disc brake systems, having a negative-servo arrangement on the brake
shoes which reduces locking considerably. Most drum brakes are arranged such
that the braking increases the pressure on the shoes when applied (positive
feedback: the braking effort is multiplied due to the shoe mounting geometry) to
eliminate the need for a servo. The servo arrangement on your car is a real
"party trick", and is one of the really unique features of your car.
The huge early MkVI brakes were OK, but the later ones are superb. A better
conversion would be to the later arrangement (a proper dual-piston wheel
cylinder among othe differences - the early one is a single piston arrangement
with a tapered expander). But again, the car would not be original.
Think hard about originality !!
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