PS Magazine - MARCH 1982
PS, The Preventative Maintenance Monthly
ISSUE 352
MARCH 1982
1
. ± ²
·
-
u
5-Ton Trucks .
..
Bralce LoE/u
p
?
.-±²³´
µ,¶ ER1 WHILe TrYiNG tO F·gU¸¹
ouº why M» 5¼½¾n'S B¿AKs
ÀÁÂlDÃÄÅ ÆÇÈÉaÊË
• .,
ÌÍ mÎ ÏÐÑÒ dÓÔÕÖ×
ØÙÚÛ ÜÝ Þbßàá âãä Våæçè
éêëì CíPîïðñò póô?
You can scratch your Head bald-and stilL miss a simpLe solution to your 5±
toN truck's brake Lockup probLem.
If you've got the wrong dummy coupLing on the front SERVICE Air
coNne²tion, your brakes
³
won't reLeAse After you AppLy 'em. This's becAuse air
pressure in the air´hydrauLic cyLinder is not being reLievedµand the cyLinder
piston can't release compLetely.
Dummy coupLings on aLL otHer brAke Air hookups are air±tigHt, but not that
one on t¶e right·front of your 5·tonner. It's got to have A breAther vaLve on it or
a hoLe iN it to reLieve pressure.
If you know you've got tHe right dummy coupLing on there, check to see if the
breather vaLve or hoLe is pLugged with pAint or dirt.
You can get the vented ¸ummy coupLing witH ¹S¹ 2º30±00»740±9445.
Or you can get the same thing b¼ driLLing a
1
/
1
6±in hoLe in A non½vented
dummy coupLing.
HOOd h±DU
p
·
8
;S
Ri
²
³
=\´µ
¾re
you
fiNding
daM
p
ness
or
beLow the top, a¿cording to PAra 2·7Àb
of TÁ
9Â2320·2Ã÷20. Ähis Leaves
rooÅ fÆr the cover gasKet and For the
braÇe fLuid to expand wheÈit gets hot.
moisture on the brAke master ÉÊinder
or power booster on Ëour Á880±series
truck? It may be A sign oF a Leakµor
may not!
You may AÌso fiNd a smaLL amount oF
Í
ÎLuid betweeN the master cÏLinder and
the power boosterÐ If there's no Loss oF
FLuid
Ñ
FrÒm the reservoirs, it's OÓÔ
Dampness can come from spiLLed
brake FLuid when the master cyLinder
reservoirs are serviced.
Dampness
can
come from overÕ
fiLLiNg, toÖ. The
fõöö
Le×eL is
÷
inØh
IF you fiNd fLuid or dampness on the
outside of the mAster cyLinder, wipe it
off with A cLean rag dampened with
cLeaning soLveNt.
If dampness or fLuid reAppears on
the outside of the cyLinder After you've
cLeaned it, repLace the master cyLiNder.
¹ow's a good time For another LeaK
check on your master cyLinder. ÙuLL the
internaL Leak check Listed iN ÙarA 2·79,
Pages 2·Ã2.Ú thru 2·Ã3, in yÛur ·20
TÁ. IF your master cyLinder doesn't
pass, repLace it.
9
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