North Wing S-LSA Maintenance Manual
Model: Scout 912
Version 3.2
Release date 04-16-2014
Page 42
bleeder valve is on the side and some air will be trapped at the top of the chamber in the
caliper. Although bleeding in this position still results in adequate braking, better braking
can be achieved if the caliper if rotated. Therefore, it is best to bleed the brakes with the
caliper just off the key so the bleeder valve can be rotated to the lowest point.
8.
To position the bleeder valve at the lowest point, it is necessary to slide the brake hub
partially off of the axle beyond the key that holds the hub from turning. Be sure the
1/8” set screws in the caliper hubs are loose. It may require tapping the back side of
the hub with a hammer to free it from the tight fitting keyway. The hydraulic line is
coiled about 1
½
turns under the root tube which will allow the caliper to slide further
out while the brake line is connected. Be careful not to slide the hub completely off the
axle or the hydraulic line may be damaged. Once the caliper is clear of the key, rotate
it until the bleeder valve is at the bottom or at the lowest point.
9.
Slide a 12” piece of 1/8” flexible clear plastic tubing over the outlet of the bleeder
valve on the master cylinder. Put the other end of the tubing in a glass container on the
ground. If the tubing is not a tight fit, it will try to slide off particularly when you open
the bleeder valve. Using a
¼
” wrench open the bleeder valves (normal right hand
thread) on the master cylinder and on one (1) wheel caliper about
½
turn. One person
should hold the tubing on the master cylinder and work the bleeder valve at that end
while a second person pumps ATF fluid (Dextron II or III) through the line from the
caliper to the master cylinder. The fluid can be pumped using a syringe or a pump-type
oil can with a piece of tubing connected from the oil can spout to the caliper bleeder
valve. Be careful not to apply too much pressure with the oil can pump or syringe
because the brake fluid will simply blow out at the tubing fittings. When no air
bubbles are seen in the line from the caliper to the tee at the rear of the root tube, close
both bleeder valves. Note, there will still be air bubbles in the line from the tee to the
master cylinder at this point.
Brake fluid pump
connected to bleeder valve
with
¼
” tubing
1
st
person pumps fluid
through lines from rear
caliper
2
nd
person bleeds front
master cylinder into
container using
¼
” tubing
on bleeder valve
10.
Move the pump/syringe to the caliper on the other side and repeat the bleeding
procedure above. However, this time continue pumping fluid until no bubbles can be
seen coming out of the master cylinder.
11.
Close both bleeder valves and slide calipers back on key. While holding the key in
keyway, line up slot in caliper and tap caliper back into place.
12.
Tighten the two 1/8” set screws.
13.
Remount wheels and wheel pants.