Aircraft Service Manual
Jabiru Aircraft
Pty Ltd
JTM001-1
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
REVISION
1
Dated: Nov 2011
Issued By: SW
Page: 109 of 233
8.20 PARKING BRAKE
8.20.1 DESCRIPTION
The Parking Brake consists of an over centre cam on the brake handle. Should the cam have
insufficient travel for the brakes to hold the aircraft with a propeller thrust of 2500rpm, adjust by one
or all of the following:
1.
Adjust brakes as described in Section 8.23.
2.
Bleed air from brake system as described in Section 8.22.
8.21 BRAKE LINING INSTALLATION
New brake linings should be installed when the existing linings are worn to expose the rivet heads.
To replace outboard lining:
1.
Remove bolts securing outboard brake pad and brake cylinder to backing plate.
2.
Remove outboard brake pad.
3.
Place brake pad on a table with lining side down flat. Centre a 1/8” (or slightly smaller) punch on
the rolled rivet and hit the punch sharply with a hammer (alternatively the rivet may be drilled
–
however take care not to damage the mount plates with the drill). Punch out all rivets securing
the lining to the pad plate.
NOTE: A replacement kit for brake pads and rivets is available from Jabiru Aircraft.
4.
Align the new lining on the pad plate and place the brake rivet in the hole with the rivet head in
the lining. Place the head against an anvil.
5.
Centre the rivet setting punch on the lips of the rivet. While holding the pad plate down firmly
against the lining, hit punch with hammer to set the rivet. Repeat blows on the punch until the
lining is firmly against the pad plate.
6.
Realign the lining of the pad plate and install and set rivets in the remaining holes.
7.
Replace the brake pad and refix with through-bolts and springs.
To replace inboard lining:
1.
On aircraft with “Quick Change” brakes, once the calliper assembly bolts are removed the inner
pad and mounting plate can be removed.
2.
For models without quick change brakes the calliper mount plate must be removed from the
aircraft: Remove wheel assembly and stub axle from undercarriage leg
– see Sections 8.5 and
3.
Remove brake cylinder backing plate.
4.
Replace lining in accordance with details above.
5.
If required, re-fit the axle and wheel assembly as detailed in Sections 8.5 and 8.6.
6.
Install outboard brake pad and refix with through-bolts and springs.
8.22 BRAKE SYSTEM BLEEDING
1.
Fill the brake master cylinder with automotive brake fluid.
2.
Loosen the bleed nipple at the brake cylinder.
3.
Pull the handbrake back to the rear stop & hold in same position until nipple has been tightened.
Release the hand brake & repeat step 3 until all air is expelled from lines.
NOTE: Ensure brake master cylinder remains full above the outlet hose.
4.
The brake callipers have been designed so that when they are in their installed position on the
aircraft any air bubbles will naturally move towards the bleed nipple outlet. However, for dual
brake systems there is potential for air bubbles to be caught at the T-piece in the line near the
wheel. If you are having difficulty bleeding a dual calliper brake system try removing both
callipers from the aircraft temporarily
and holding 1 calliper above the “T”. Also ensure that the
“T” is rotated. Leave the assembly in this position for 5 – 10 minutes to allow any air bubbles to
make their way into the high calliper then re-assemble and bleed as normal.
