Yamaha TDM850 User Manual page 154

7»4 Brakes, wheels and tyres
2.2c Remove the pad pins...
2.3a Pad wear indicator tangs (a) and minimum friction material limit (arrowed) ■
and withdraw them (see illustration). Remove
the inner pad, noting how it locates against the
guide pin on the caliper bracket, then remove the
outer pad, noting how it sits in the caliper bracket
(see illustration). Where fitted, remove the
shims from the back of the pads, noting how they
fit. Separate the bracket from the caliper, noting
how it fits (see illustration). Remove the pad
spring if required, noting how it fits (see
illustration 2.11a).
3 Inspect the surface of each
contamination and check that the friction material
has not worn level with or beyond the wear
indicator tangs or groove (see Chapter 1) (see
illustrations). Yamaha also specify a minimum
friction material thickness (see
2.3b Pad friction material showing wear limit groove - XTZ
models
2.2d .. and lift out the pads, noting how
and TRX
Specifications) which should correspond with the
tang height or groove depth on genuine Yamaha
pads. It is strongly advised that the pads are
renewed well before the wear indicators or
minimum amount of friction material is reached.
The pads should also be renewed if they are
fouled with oil or grease, or heavily scored or
damaged by dirt and debris; it is not possible to
degrease the friction material. Always renew both
pad for
pads in the caliper and renew the pads in each
front caliper at the same time. 4 If the pads are in
good condition clean them carefully, using a fine
wire brush which is completely free of oil and
grease to remove all traces of road dirt and
corrosion. Using a pointed instrument, clean out
the grooves in
2.2e Slide the bracket out of the caliper
they fit
the friction material and dig out any embedded
particles of foreign matter. Any areas of giazing
may be removed using emery cloth.
5 Check the condition of the brake disc{s) (see
Section 4).
6 Remove all traces of corrosion from the pad
pins. Inspect the pins for signs of damage and
renew them if necessary.
7 On XTZ models, clean the old grease off the
caliper slider pins on the bracket and check the
rubber boots in the caliper (see illustration
2.2e). If they are damaged or deteriorated, they
TDM
should be renewed.
8 Push the pistons as far back into the caliper as
possible using hand pressure or a piece of wood
as leverage. Due to the increased friction
material thickness of new pads, it may be
necessary
reservoir cover and diaphragm and siphon out
some fluid.
9 Where removed, fit the shims onto the back of
the pads, making sure the arrow points in the
direction
illustration). The following step is necessary on
UK models, and anywhere else where salt is
used on the roads, to ensure that the pads move
freely in the calipers. Apply a thin film of
Duckhams Copper 10 or equivalent to the
2.9a Fit the shim onto the back of the pad, making sure the arrow
points in the direction of normal disc rotation
to remove the master cylinder
of normal disc rotation (see
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