On 2/19/06, Robert Fisher <refisher@mchsi.com> wrote:
> The question seems to be 'can you upgrade to "big brakes" using the stock
> later-model calipers and just purchasing the larger rotors/pads (as opposed
> to the whole 'kit')?' Karl was saying the piston is the same size, but does
> that mean the entire caliper is suitable? Kim says they 'mount further out'-
> how is this done?
>
> It follows that if you could indeed use the stock calipers, provided they
> were in good condition or at least good candidates for rebuilding, you could
> save a good bit of money over the 'kits' by just getting the rotors and pads
> (assuming you already had larger wheels)... Some clarification, please?
>
> Cya,
> Robert

Robert,

The caliper has much heavier architecture as the keyway for the rotor
is much wider. There are additional ribs on the caliper itself for
added strength. Since the rotors are larger in diameter, the SA
calipers have their mounting holes further away from the top of the
caliper so that when installed on the steering knuckles, the net
effect is they are positioned about a half inch further out from the
center of the hub.

VW did something very similar to the Syncro 16. In that application,
they changed the steering knuckle (aka suspension upright). They
"pushed out" the caliper mounting so that the LT28 rotor (same size as
SA rotors). The calipers used is the same as regular Syncros and
Vanagons. That is because despite being of the same diameter., The
LT28 rotors are single plane.

The problem with these systems for Syncro 16 owners like myself is the
SA calipers will sit another half inch further out on the SA rotor. It
does open up possibilities of using 12 inch rotors from a Mercedes
with the SA calipers on Syncro 16 uprights.

RE: rear discs. I would do it because it is eaasier to replace pads
than drums. Olus they clean up better and faster after a run through
the mud. They are also less prone to fade as the can run cooler. They
do not get the "bell effect' associated with overheating drums.

BenT