Maybe I misrepresented what I said earlier. So here’s a little bit of an
explanation as to what I said.
Dan
FRONT BRAKE CALIPER SHIMMING: As mentioned above, there is a shim (or a
couple of shims) between the steering arm and the brake caliper at the long
bolt. The objective of this shim is to compensate for variations in the
thickness of the caliper mounting lug to avoid stressing the steering lever
as the bolts are tightened. If your plan is to take things apart and put
them back together with the same hub carrier, caliper, and steering lever,
you need to take care not to drop or lose those shims when you take the long
bolt out. If you put it back together with the same shims in place, you
should be OK.
If you do plan to replace something – exchanging the caliper for a rebuilt,
for example – you will need to measure for the correct shim thickness.
Mount the steering lever with its short bolt tight and the long bolt
threaded in but not tightened; you may want to fit a flat washer on the
short bolt between the dust shield and the steering arm to make up for a
bracket attached to the caliper being omitted here. Measure between
steering arm and upright at the long bolt, and subtract the thickness of the
caliper mount lug to determine the shims needed.
New shims are available from Jaguar in two thicknesses: C44146/1 is 0.004"
thick and C44146/2 is 0.010" thick. It’s really nothing more than a thin
flat washer, so you could just buy arbor shims locally or cut washers out of
shim stock.
Whenever changing shims or anything else involved in this steering arm
attachment, the car will need a new alignment afterwards.
It is apparent that the shimming between the caliper and steering lever was
originally the only place shims were intended to be used here. Step 4 of
Section 70.10.10 and step 3 of Section 70.55.02 in the ROM clearly indicate
this is the only place to be looking for shims upon disassembly. However,
apparently Jaguar decided that shims might also be needed between the
caliper and the upright, either to center the caliper or to align it
properly. There’s no excuse for the machining incompetence that would
require shims here for either reason, but Craig Sawyers and others report
that their cars came with shims in these locations. Steps 10-14 of Section
70.10.10 and step 5 of section 70.55.02 discuss shims between caliper and
upright for centering and aligning the caliper.
The Parts Catalogue doesn’t list any shims for between caliper and upright,
but obviously the shims intended for between caliper and steering lever will
serve.
It’s pretty easy to get shims in between the caliper and steering lever.
Getting shims between caliper and upright is nowhere near as easy.
If you add shims between the caliper and the upright, you need to be
removing the same thickness of shims between the caliper and the steering
lever!
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