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Jabiru J450 Constructors Manual
Pre-Paint>Fuselage>Undercarriage>Assemble main gear
Tuesday, April 6, 2010
35 of 343
Assemble the brake pads
Fit the brake pads to the backing plates: there are 2 types of backing plates – flat and U
channel. Both types use same pads, but the shorter rivets are used on the flat backing plate.
Face the angled side of the pad to the outside of the backing plate as shown in the photo of
completed pads below right. Each brake pad is held in place by 3 rivets and the fitting process
is as follows: fit all 3 rivets from the recessed hole in the pad through the pad and though the
backing plate. Note that fitting the third rivet may need a slight touch with a drill to ease the
rivet through the last hole.
Seat the rivets by tapping the heads to make sure that each rivet is fully through the pad and
the backing plate, then turn the assembly over and rest the head of the rivet on a protrusion*
and flare the rivet using a tapered punch then use a flat punch to mushroom the end of the
rivet over. The rivets should not be able to move when correctly fitted.
*In the factory we use a simple jig that holds the backing plates over studs at each end and has
3 raised screws to hold the rivets up – you can see it in the riveting photos above.
You could make up something similar in your workshop by screwing 3 screws into a solid
wooden bench (use a backing plate for the spacing), all at the same height so that the brake
pad just clears the bench and the head of each screw touches the head of each rivet, then place
each brake pad and backing plate over them and use them to punch against.
Check each brake pad and backing plate assembly carefully to see if there are any cracks in
the pad, particularly around the end rivet holes. If there are any cracks call your dealer for a
replacement pad and rivets: do
not
fit a cracked brake pad.
The brake pad and backing plate assembly will be referred to as simply a
pad
from this point
on. The U channel pad is the
outer pad
and the flat plate pad is the
inner pad
.