PS Magazine - TB 43-PS-435
PS, The Preventative Maintenance Monthly
ISSUE 435
FEBRUARY 1989
Take a look at brake lining any time
You have the wheel of. IF the l±ning
±s woR to within ²S-inch oF the rivet
heads; or ³r bonded lin±ngs, beyond
the specs called ³r in your ´20 TM,
replace the brake shoes.
No Solvent on Brake Shoes
When brake shoes get covered with
d±µ or mud, clean 'em with compres¶
sed air, water and a brush. Never use
dryclean±ng solvent. It breaks down the
material ±n the l±ning.
·eplace the
shoes iF there's anyth±ng on 'em that
air and water won't take o¸F¹
Do Not Touch!
Look, but don't touch the master cyº
linder dust boot. IF you don't see brake
»lu±d on the boot, leave ±t alone.
¼hen you pull the boot back to look
³r Flu±d, you can le½ dirt and gr±t get
on the rod¾ Then when you use the
brakes, the d±rt on the rod rubs like
sandpaper on the seal, and beFOre long,
you've got to replace it.
If the boot
looks good from
the outside,
leave it be
32
FEB 89
Stick witH SteeL ±ubing
Copper tubing ±s ¿ot ³r hydraUl±c
braKe lines. Àopper tub±ng won't hold
Up to the h±gh pressure in hyDraUl±c
braKes. It caÁ Âpture at a crUc±al moÃ
meÁt, leav±ng the vehicÄe withoUt aÁy
way to stop. Åt±ck w±th Æteel!
Åome l±ÁeÆ are ³olers. ¼heÁ you're
not ÆUre iF a l±ne ±s steel or steel plateD
copper, use a magnet. The magnet w±ll
st±ck to a steel l±ne¹ No magnet? TaKe
a pocket kniÇ and try to Á±ck the tUbÈ
ing. Åteel is tough to cut, so iF ±t n±cks
easily,
it's copper.
AnD remember,
doUble ÉÊre all brÊKe l±nes.
2%-
and 5-ton C²evis Pin
Ënd mechanics, you can get someÈ
body killed ±F you use a nUt and boÄt
±nstead oF a clev±s pin at the truck's
master cYl±nder. The nUt v±brates of
a standard bolt, and ¼ham! Ìo brÊKes.
All M44´, M39Í, and M809´ser±eÆ
trucks have the r±ght p±n listed ±n the±r
FEB 8±
33
Nosubsti-
accepted²us
:
±
clevis pin
Í20P ÎM's. Its eaƱer to Ïnd anD use
the clevis p±n than to expla±n aFter an
acc±dent why You useD a suBstitUte.
Tagging Saves ³ives
Ðlap a red tag on the steer±ng wheel
while a truck ±s NMÀ ³r brÑe ÒorkÓ
It m±ght save a liÇ.
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