Dodge MD Series - Page 25

GENUINE <f<fEQUAL PRES·
SURE~~ HYDRAULIC BRAI(ES
Th c brak cs in your tru ck ar e th e pe rf ec ted re "ult of thirte en
ye an ; ( ~ xp e ri c n ce in d e!' igning and buildin g hphoauli c hrak e"o
and ar e silllple in op e ratioll , (l epe nding on th e hydrauli c prill-
cipl e by whi ch pr css ur e exc rt cd again st a clo se d C OIUIIIII of
liquid is di"llojlmted c tl'lall y alltl undimini shed in all dir et"lion ,.;
in s uring e qual braking pr e Hlr co
Wh en you deplocss th e IJrak e pe dal Lit e hnlkt' lIla,.;Lt'r cylind er
pi stoll is forc cd forward whi ch lIIo,-e lll e nt "hut,.; off th e r eo er-
v oir brak e fluid ,.; uppl y and cr e at es a pr e,.;"ure on th e fluid in
th e 0 y te ll1. Thi s fluid pr es,,; lu oe is trall slllitted through me tal
tub es and non- e xpallding ho ses to th e wh eel eylind er·
o
. Th e
add ed '- 01 ull1 e :IIHI pr ess ur e ea use;; th e two carcfull y eal ibrat e (I
wh eel c ylind er pi " ton s at
each wh eel to be pu,.;hed in
oppo site dir ec tion ,.; toward
th e brak e cIrUllI::;. Thi s
JI10y eme nt tran s mit s th e
hraking fOl
o
ce dir ectly to
the brak e s ho es th ere by
46
forcing th e brak e s ho e lining s illto c ontact with th e brake
drum s, thu s produ c ing braking action in dir ect proportion to
the pr ess ur e exe rt ed Oil th e foot pellal, bringing th e truck to a
";lIIooth, easy s top.
An exalllple of th e :ulvanta ges of eqllal pr e:;s ur e h y tlrauli e
brak es IIl:1 y be seen in 1.1\1' use of '"ste pp e lr ' hrak e c ylind ers in
('aeh wh eel. By thi s we lII e an that th e rear of th e wh eel cy lind er
is larger than th e front so that th e pi ,; ton op e rating th e r e ar
" ho c is larg er than th e olle op e ratillg th e front "llO e. Th e reasoll
for thi" i :; as follow s : In th e pa4 th e front brak e " ho e in e ach
wh eel di(1 a ,.; Ii glltly gr eater ,.;hare of the work hel"an ;;e of th e
forwartl 1I10\"('III (' nt of th e truck. C OII "t'tlu('ntl y, th e fron t s ho e
linin g wor e fa"ter than that 011 th e r e ar. No w, Il y " ste ppin g
lip"' Lh e "ize of th e re ar pi ~ ton of each cylind cr th c pr es,,; ur e
on th c /"I ' ar ,.;ho e of e ach wh eel i ;; in crca :"e d so that th e re ar
hrak e "llO e,.; now do th e ;.; am e alllount of work as th e fronl.
Th e rt'" ult is {'lJual I" ' akt' linin g wear.
It is therefor e appar ellt that "c lJual pr e;;s ur e" hytlrauli c IJrakes
ar c s up e rior not onl y to III c chani( 'al \'rak e,,; but al"o to oth cr
typ es of hydraulic brak es.
It is illlportant that on ly ge nllin e Is o-Drak c Fluid be II se t! ill th e
h y dralll ic braki ng sy:,; telli. Do 1I0t :J(ltl I " o-Drak e Fill id if oth er
fluill ha s b ee ll lI;.; e (I all(l IIC ' ·Cl
O
:J(ltl oth cr fluid to a systcm con-
tainin g Iso-Drak e Fluid .
J~( ~ ('P Yo"r IlraJ.·(>s At ; F"ll
/ -., jf; dell cy
As a s af ety pr c caution. tak e YOllr tnu·k to ),Ollr r111thorizeo
_d ealer at regul ar int e n-al s, for a compl ete brak c in sp ec tion.
47
www.PlandeGraissage.org