7. Some copper lines look like steel. When you're not sure if a line is steel plated copper, use a magnet. If you don't
have a magnet, use a pocket knife and try to nick the tubing. Steel is tough to cut, so if it nicks easily, it's copper.
While you're at it, check all lines to make sure they are double flared before you put them on.
SECTION VIII. PAINTING
1. Never paint a flexible hydraulic brake hose, but if paint is already there, leave it alone. The harsh solvents needed to
remove the paint will harm the hose more than the paint.
2. Paint hides cracks and cracks in a brake hose lead to brake failure. Replace a painted hose at the next scheduled
service or anytime you spot a crack that goes all the way down through the cover to the fabric.
3. For additional information on brake hose inspection, see TB 9-2300-405-14, Mandatory Brake Hose Inspection and
SECTION IX. TAGGING
Place a red tag on the steering wheel while a truck is NMC for brake work. It might save a life. A red tag tells you
and anyone else that the truck is NMC for brakes.
You can order 50 of the red tags, DD Form 1577, with NSN 9905-00-537-8954.
SECTION X. BRAKE PROBLEMS-CUCV
The rear brake drum on an M1009 CUCV is hard to get off when rust freezes it to the flange.
The following is the easiest way to get the drum off.
a. Clean rust and dirt off the drum and flange with a wire brush.
b. File off any burrs on the flange.
c. Squirt penetrating oil, NSN 6850-00-973-9091, where the drum slides over the flange. Give it a few minutes to
d. Put a bar between the drum and backing plate and carefully pry out while you gently pull off the opposite side
of the drum. Be careful not to bend the backing plate.