PS Magazine - TB 43-PS-435
PS, The Preventative Maintenance Monthly
ISSUE 435
FEBRUARY 1989
_ ,
Good Housekeeping
Hold one, befre you open the mas-
ter cylinder cap! The cyLiNder is under
the trap door in the Foorboard on
2\±-
and
5±ton
trucks
with air/hydraUlic
brakes. There is usUaLly a lot o² dirt,
water and other junk yoU don't want
in the master cyLinder on the ²Loor-
board.
Give the ²Loorboard a good sweeping
be²Ore you open the trap door. ³hen
use an air hose to clea´ the area around
the ²iLLer capµ ¶² course, you a·ways
wear goggles when yoU cLea´ with
compressed air.
30
A LITru
HOUSEKe²PiN
Can pR³´µt B¶· ¸¹oblºM'
Wh»¼ Y½¾ O¿£À ÁÂÃ
mÄsÅÆÇ cyÈIÉÊËÌ
!
I² you need to add brake Fuid, put
the cap back on while you go get the
Fuid and ¸¹nneL. Just a couple grains
o² sand or ºw specks o² d»rt inside the
brake system causes major pRobLems
down the road. A ²ew minutes o²
housekeeping is one o² the most impo¼-
tant things you can do to prevent prob-
lems wi½h your truck's brake systemµ
AvOID fUt±rE
PrOblEmS by
KEEPIN² thE
fIllER caP ON
FÍÎ 89
Tes³ing
¾est the brakes in the motor pool,
not on the road. I² anything ºeLs wrong
or looks out¿o²¿pLace,
take time to
check it oUt by the brake troubLeshoot-
ing sectio´ i´ the truck's
-2Ï
TM.
Wrong hookups on any o² the Lines
messes up the whoLe system. I² you
have to take anythiÀg in the system
apart, make sure everything goes back
Like Át's supposed toµ The maps yoU
need to trace the Lines and pinpoint the
connectio´s are also in the
-2Ï
TM' sµ
AlwaysÂeverytime yoU break a Line
to replace a componentÂbLeed the en-
tire brake system.
´µ¶gging ·¸oes
¾
ake the truck out on the road and
hit the brakes. I² the truck puLLs to one
side,
the brake shoes are probabLy
dragging on the brake drumµ
Adjust the shoes a´d try the road test
againµ I² the trUck stiLL pULls one way
or the other when you hit the brake
pedaL, it could be either a rUsted or
sticking wheeL cylinder, or glazed or
oiLy brake shoesµ
FÍÎ 89
31
Brake shoes are cheap and trucks are
expensive .
.. and you can't put a price
on a liº. Ãorget shortcuts Like sanding
a glaZed brake shoe lining. I² a shoe
is gLazed, woÄ, or has grease or brake
Fuid on it, don't try to clean it Up.
ÅepLace it aLong with alL the other
brakes shoes on that aXLe. This keeps
the brakes working evenLy.
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