PS Magazine - TB 43-PS-437
PS, The Preventative Maintenance Monthly
ISSUE 437
APRIL 1989
arefl when you hook up the brake aiR hoses Fom your trailer to your 2Y±-
or 5²ton truck. ³ou can end up with the brakes that won't let go´
Iµ you cross the lines, the brakes will lock, buM up, and ¶uin tires.
It's easy to get it right, though. Just remember the SE·VICE air coupling on
the tow vehicle is always on the leµt side and the E¸E·GENC³ is on the right.
Or color-code the air hose connectors and vehicle couplings: a dot oµ yellow
on the SE·VICE connectors and reD on the E¹E·GENC³ connectors. Keep
paint oº rubber couplings. The» just ¼atch color to color µ½r hookup.
ID Plate
21-ton truck
5-ton truck
EMERGENCY
NSN9905±²774³428
NSN9´µ00³9¶9³7369
SERVICE
NSN ¶905·0-740³972¸
NSN 9905³¹³999-7370
14
... to truck
coupling
APR 89
impro¾ed
mounting bracket on 1/4²ton trucks can
rub a hole in the brake line¿leaving
you with no brakes.
Take a look at the hose. There should
be at least ÀÁ²in clearanÂe between the
line and the top oµ the bracket, and
Ã/±²in oµ space at the bottom.
Iµ
there's
not
enough
cleara»ce,
move the hose, gently. Bend the brake
line at the "TÄ and tuM the hose clamp
on top oµ the rear sUsPension arm.
CareÅul though, don't move them more
than tHey need.
Once the line is in the clear, have a
buDdy
aPply
the brakes
while you
check the line Ær leaks.
'";caº »rucKs .
.
N
f
Y
£f
Paint Brake Hoses
N
ever paint a µlexible hydraulic brake
Çor more inµ½, see the brake hose
hose, but iµ paint is already there, leave
inspection TB, TB 9-2300ÈÉ05-ÊÉ.
it alone. The harsh solvents needed to
remove the paint will harm the hoses
more than the Ëaint.
Ìaint hides cracks and cracks in a
brake hose lead to brake Íilure. ·eÎ
Place a painted brake hose at the next
scheduled service or a»ytime you spot
a crack that goes all the way down thru
Ï
the cover to the µAbricÐ
Never paint a brake hose¼
but if ½t is painted, leave it alone
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