Dodge Sprinter 2006 Manual page 788

5 - 4 BRAKES - BASE
As t h e dr a ggin g br a ke over h ea t s, efficien cy is so
r edu ced t h a t fa de occu r s. Sin ce t h e opposit e br a ke
u n it is st ill fu n ct ion in g n or m a lly, it s br a kin g effect is
m a gn ified. Th is ca u ses pu ll t o swit ch dir ect ion in
fa vor of t h e n or m a lly fu n ct ion in g br a ke u n it .
An a ddit ion a l poin t wh en dia gn osin g a ch a n ge in
pu ll con dit ion con cer n s br a ke cool down . Rem em ber
t h a t pu ll will r et u r n t o t h e or igin a l dir ect ion , if t h e
dr a ggin g br a ke u n it is a llowed t o cool down (a n d is
n ot ser iou sly da m a ged).
REAR BRAKE GRAB OR PULL
Rea r gr a b or pu ll is u su a lly ca u sed by im pr oper ly
a dju st ed or seized pa r kin g br a ke ca bles, con t a m i-
n a t ed lin in g, ben t or bin din g sh oes a n d su ppor t
pla t es, or im pr oper ly a ssem bled com pon en t s. Th is is
pa r t icu la r ly t r u e wh en on ly on e r ea r wh eel is
in volved. H owever, wh en bot h r ea r wh eels a r e
a ffect ed, t h e m a st er cylin der or pr opor t ion in g va lve
cou ld be a t fa u lt .
BRAKES DO NOT HOLD AFTER DRIVING THROUGH DEEP
WA TER PUDDLES
Th is con dit ion is gen er a lly ca u sed by wa t er soa ked
lin in g. If t h e lin in g is on ly wet , it ca n be dr ied by
dr ivin g wit h t h e br a kes ver y ligh t ly a pplied for a
m ile or t wo. H owever, if t h e lin in g is bot h soa ked a n d
dir t con t a m in a t ed, clea n in g a n d/or r epla cem en t will
be n ecessa r y.
BRAKE LINING CONTAMINA TION
Br a ke lin in g con t a m in a t ion is m ost ly a pr odu ct of
lea kin g ca liper s or wor n sea ls, dr ivin g t h r ou gh deep
wa t er pu ddles, or lin in g t h a t h a s becom e cover ed
wit h gr ea se a n d gr it du r in g r epa ir. Con t a m in a t ed lin -
in g sh ou ld be r epla ced t o a void fu r t h er br a ke pr ob-
lem s.
WHEEL AND TIRE PROBLEMS
Som e con dit ion s a t t r ibu t ed t o br a ke com pon en t s
m a y a ct u a lly be ca u sed by a wh eel or t ir e pr oblem .
A da m a ged wh eel ca n ca u se sh u dder, vibr a t ion a n d
pu ll. A wor n or da m a ged t ir e ca n a lso ca u se pu ll.
Sever ely wor n t ir es wit h ver y lit t le t r ea d left ca n
pr odu ce a gr a b-like con dit ion a s t h e t ir e loses a n d
r ecover s t r a ct ion . F la t -spot t ed t ir es ca n ca u se vibr a -
t ion a n d gen er a t e sh u dder du r in g br a ke oper a t ion . A
t ir e wit h in t er n a l da m a ge su ch a s a sever e br u ise,
cu t , or ply sepa r a t ion ca n ca u se pu ll a n d vibr a t ion .
BRAKE NOISES
Som e br a ke n oise is com m on wit h r ea r dr u m
br a kes a n d on som e disc br a kes du r in g t h e fir st few
st ops a ft er a veh icle h a s been pa r ked over n igh t or
st or ed. Th is is pr im a r ily du e t o t h e for m a t ion of t r a ce
cor r osion (ligh t r u st ) on m et a l su r fa ces. Th is ligh t
cor r osion is t ypica lly clea r ed fr om t h e m et a l su r fa ces
a ft er a few br a ke a pplica t ion s ca u sin g t h e n oise t o
su bside.
BRAKE SQUEAK / SQUEAL
Br a ke squ ea k or squ ea l m a y be du e t o lin in gs t h a t
a r e wet or con t a m in a t ed wit h br a ke flu id, gr ea se, or
oil. Gla zed lin in gs a n d r ot or s wit h h a r d spot s ca n
a lso con t r ibu t e t o squ ea k. Dir t a n d for eign m a t er ia l
em bedded in t h e br a ke lin in g will a lso ca u se squ ea k/
squ ea l.
A ver y lou d squ ea k or squ ea l is fr equ en t ly a sign of
sever ely wor n br a ke lin in g. If t h e lin in g h a s wor n
t h r ou gh t o t h e br a ke pa ds in spot s, m et a l-t o-m et a l
con t a ct occu r s. If t h e con dit ion is a llowed t o con t in u e,
r ot or s ca n becom e so scor ed t h a t r epla cem en t is n ec-
essa r y.
BRAKE CHA TTER
Br a ke ch a t t er is u su a lly ca u sed by loose or wor n
com pon en t s, or gla zed/bu r n t lin in g. Rot or s wit h h a r d
spot s ca n a lso con t r ibu t e t o ch a t t er. Addit ion a l ca u ses
of ch a t t er a r e ou t -of-t oler a n ce r ot or s, br a ke lin in g n ot
secu r ely a t t a ch ed t o t h e sh oes, loose wh eel bea r in gs
a n d con t a m in a t ed br a ke lin in g.
THUMP / CLUNK NOISE
Th u m pin g or clu n k n oises du r in g br a kin g a r e fr e-
qu en t ly n o t ca u sed by br a ke com pon en t s. In m a n y
ca ses, su ch n oises a r e ca u sed by loose or da m a ged
st eer in g, su spen sion , or en gin e com pon en t s. H owever,
ca liper s t h a t bin d on t h e slide su r fa ces ca n gen er a t e
a t h u m p or clu n k n oise.
STAN DARD PROCEDU RE
STANDARD PROCEDURE - MANUAL BLEEDING
Use a ppr oved br a ke flu id (Refer t o LUBRICATION
& MAINTE NANCE /F LUID
TION). Use fr esh , clea n flu id fr om a sea led con t a in er
a t a ll t im es.
(1) Rem ove r eser voir filler ca ps a n d fill r eser voir.
(2) If ca liper s, or wh eel cylin der s wer e over h a u led,
open a ll ca liper a n d wh eel cylin der bleed scr ews.
Th en close ea ch bleed scr ew a s flu id st a r t s t o dr ip
fr om it . Top off m a st er cylin der r eser voir on ce m or e
befor e pr oceedin g.
(3) At t a ch on e en d of bleed h ose t o bleed scr ew
a n d in ser t opposit e en d in gla ss con t a in er pa r t ia lly
filled wit h br a ke flu id (F ig. 1). Be su r e en d of bleed
h ose is im m er sed in flu id.
VA
TYP E S - DE SCRIP -