NISSAN SERENA 1993 Service Repair Manual

LOAD
SENSING VALVE
BR.7

LOAD
SENSING VALVE
Bemoval
. B€
eralul nol lo spl.sh b..k€ nuid d peinLd
arca; il mav
eu* p.inr
d.n.ge. I bEke nuid i.8pl..hed
d p.lntea
at@ w6h ll away wnh waler lnmedlalely,
. Femovenare nuls and LSV bolls.
lnstallation
. R€fll
whh nwbEk€ nuid DOT4'.
. Na€r
ds dEin€d br.ke nuid.
. Chek
l€v€l in bEk€ f,uid rerolr.
1. Tlghlen prcvsonay
llar€ nuls.
- _ P: i,4.
i,9 n (3.s.4,0
ks-m,2s.1 .2s
firb)
|ol:9.11 Nml03.1,l kcm. d5 -
3.7 iubl
4. BeiAdr cerer
i6 "Bbedi.o-
"oeou.e n
itn grrro
]NG".
s. Adjlsl load s€n6inQ valve (LSV)
Feler lo Inspeclion
and
Adjlsh€nr" in "LOAD
SENSTNG VALVE .
IRS MOOELS
ll il is ne@ssad
lo instal
a new LSV brack6l. mak€ su€ that
il is inslalled
@nedly acooding lolhe tolowing disranc.s:
Dlslane 'A":
1175 dm 14.6c inl
ll above m€nloned valu€s are nol
mel, oadsensinovave{lll
loos€ ii6 €lietiveness
and lhe handling ot lhe vehicle courd
. Do noI .djugr I.sV spring lsgrh
by tumlng or mvlng ISV
bEcksr O. To
adi6r t.sv
.p.l.g rengrh
Eier to h.D€cnon
. r
lhe rehicle hB
ben
lacked up
with th. rh.€b otl th6
gbund, lorer lhe whlcle 3lowly. FailuE to do $, 6dd
eus ft. angl€ A lo ch.nge.
BR{

LOAD
SENSING VALVE
Installation (Cont'd)
,1.
'//
q'sc4rr"l
*'/'\
./':
BR€

LOAD
SENSING VALVE
Insp€clion and Adjustment
. Chek
l4l In
brake nuld lt.amn,
. Renll efth lw bhte n0ld DoT4'.
. N.c
€@ dr6in.d bdG
nuii
. B.
eElul rbtto.pL6h
bhke nulrl on palnt
d6|tsihruy
eB pdnl
dam.ge, t bdke fiuld ls sOl6lh€d on pdnrcd
.Ba @.t lt amy wlth qat€r
htudl|ldy.
1. Beto€ adjust ng load sensing valve
sp nqle.gth,checktor
popBr inslallation and abnomal wear ol b6ks pads
and
2. Fedovo lh6 air bled lrom
the wheet €tiper, and nstatl
a p€$uBgauo€
(a)lo
lhe bleed valve hole.
(:!
D 3.
Bl@d ihe
air lom rh6 toni bEke pipr.g.
4. R.m@e
the at bleed v, v€ lbm
the rcar wh€et cytindor,
and insial a p@$uE
sauq€ (b)
io lhe bl€6d valvB hol..
BF-10

LOAD
SENSING VALVE
Inspeclion and Adius:menl(Cont'd)
5, Bleedlhe anlom lhe r6af brake pipinq.
The 'Load
Se.s ng Valv€ is attachad
to the body, ovor lh€
reai axle. To adjust lh€ Lsv
@irectly, p@ce€d
as iollows:
With unladen v€hicl€ (engine
lullol wal€r and oil,lle
of5
lilerc, wilh sparc lyr6
and wilhoul lools) ch€ck lhe lenath
ot
lf rh6 spnna bnalh
is d llercnt trom rhal sp& lied.
move lhe
€qu.lion lever (2)
unlillh6 specilied value
is oblan6d.
Move lhe LSVlever(l)un
n @ntacts w ih fie sbDD€r bol
and @check lh6 spnng
bnglh.
SeMr spd.g
|mgrh 'L':
lRs modob: a)6,5 mn la.12lnl
Flgld @r db modeGi 213
mfr (a3a
in)
NOTE: Do nol dialub Etopper
bolt
Stan lhe
enqine and run I al dinq
speed.
Slowly deprcss lh€ bEke peda
uitit an inpur pr6ssu@
ot
5,000 kPa (50
bar,49 kg/.m?,
725 psi)
is obrained (at
lhe
loni axle p€ssu€
Oalge)and an
oulputpressu€
o15.000
kPa (50
bar,49 kg/cm?,725 psl)baris
obiain€d (at
lhe €ar
axl6 p€ssu€
qauge)(seeTabe
on ne{ paae).
6. Pace
a weghr (c)
in rhe
center at lhe Gar oi
tha vehicte,
above the Gaf axl€, so
thal the Lsv sp nq
\6) has
a new
L Wth
lhe engine runninq al idlinq
speed, deprcss the
brake
pedal u|li obtainino
lhe followins prcssures:
gR-l1

LOAD
SENSING VALVE
Inspection and Adluatment (Cont'd)
NFOAiiAIION ABOUT THE LOAD SENSING VALVE
When adjusling LSV spnng bnglh
O wilh
unlad€n v.hcl€
L=206.s mm (3.12
in) (lBs
mod6b) or213 mm (3.33
in) (Blsid
€ar.xl€ mod6ls), LSV 'leve/'
h.s lo touch
.loppd boll.
Spring lenght
"L" has
to be obiained at laden vehice.
8R.12

BRAKE
PEDAL AND BRACKET
Removal and Insialldion
Inspectlon
Chsck b€ks p€dallor
lolowing iloms:
. Cl€vis pin
d€lomaton
. C€ck ol any welded ponion
. Cack or dotomalion ol clBvis pln
siopp€r
AdJustment
Chedr bEk€ pedallF.
heiAhtlrom d6h reinlorcement panel,
H: FE
helgh
Feler to s.o,s.
D: Fdl Blrole
Fcier to so,s.
c: Cbame b.twn p6dal
.riopF.r 6nd th6..l€d
.nd ol top lMp .-ich
0.3 -
1.0 nn (0rt2 -
o(Fs In)
A: P6dtl le pl6y
1.0 -
3.0 mm (0.0:x| -
Ol la in)
8R.13

BRAKE
PEDAL AND BRACKET
Adiustment (Confd)
ll r.cssary, adjust bEke pedal
ffe€ haiqhl.
1. Loosn lock nui and adjust pedal
lBe h€iqht by trning
bnk6 bocre. inpul rod- Ihen tighlen lock nul.
M.lc .uE rhat dp ol Inplr rod srays In.lde .f clevl4
2. LoosEn lock nul and adlust deaEn€ "c
wilh stop lsmp
switch. Then tighton look nuts.
3. Ch€ck p€dal
l@e p
ay.
t{rke auE ih.l slop l.npl go
ofi w'En p€d.l
i3 €l.e.d.
4. Ch€ck bBk6 p.dsls
d.prBss€d hgighlwhile engine is run-
It depe$ed heighl is
below .p€cilied valu€,
ch€ck b6ke
systen lor l4ks, accumulaiion ol at or any damage to
conponenls (m$t6r
cylindBr, Blc.); lh6n make neessry
Bn-l4

MASTER
CYLINDER
w
-{
Removal
BG e€tu| mt to
+1..h bE*€
tluid on p.inl€d
.8.; i mry
e@ p5tn
d6fiag€, F br*. nuH i. atl*h€d d
!.lnled a@3r
m8h h 'my snh wat
r lmmedlately.
L Connecta vinyltube b an bbeder valve.
2. Dain b6ke lluid trcm $ch an b 6€d€r valv6,
deprcssing
b6ke pedallo
6mpry lllid irom masr€r cylinder.
3. B6mov€ brak€ pip€
fl.e nuls
4. B€mov6 masler
.yl nder
mou.ling nu6.
5 Fenove ptoledor
o/ncslor cvl'nder a1o avoid
6cr6tch'nq
the surfa€ ol m.sl6r cylinder
duing remova.
Do nol dl3'ss4ble
m4.ler cylindei
NOTE:
h h b |Eegry lo chang6 lh. bEk nuid |€srcn,
em@ h
6 3tom In th6 illustration on rlE btl, whil€ houlng
lte sl3
h i.
not neceery
to Eplae lhe sls it rh.y aB in . good
Installation
. R.fll
wilh na
bake iuld DOT4,
. N*r es dnlned b6ke n!id.
1. Place fraster oylindef onlo brak€ boo6ler
and secure
molnting nuts liohrly.
2. Fil flare
nuts lo maslei cylinder.
3. Tighlen dounti.g nuls.
. _. P): 21.29N8(2.1.3,0*gFm,
155-21in-|b)
p):9- rl Nm (03-
1,1 kg{, 65.3,7 fib)
r Bleedar Beler
ro Beedns Prcced-r€ rn AlR B-TFO-
ING".
BR-l5

BRAKE
BOOSTEB
r*w On-vehicle
Service
OPEFATING CHECK
. oep@s brake pedal
seveal times wilh engine ofi, and
check that th€G is no change in p6dalslrck€.
. o6p€.6
b6k. p.da|lhen
sl,an engine.It pedalgoes
down
slighlly, opediion is nomal.
AIRTIGHT CHECK
. Siart enqine, and stop il after one of two minut6s. D.press
bEke p6dal
s€voEl lim6s slowly. It pedal
goes
lunher
down lh. lircl I m€ and gEdlally
nses atler s@nd or third
lim€. boosl.r i5 ainighl.
. O6p€65
bEke pedal
whie engine is runninq, and srop
enqine wilh pedaldepressed.lllherc
s no chang€ in pedal
sloke alter holding p€da
down lO sond6,
brake b@ster
Removal
. Bs
cetu|nd lo sdBh
bFlG nud on
t lnled
aE6; hn.y
d4 Finr d.m.ge,
lf bhke nu|d b 3preh.d d p.ilned
'w, wah ft away whh wat6r ififi€diai€ly.
. Be
6r.tu1 noi to d.fom or
bend bElc pbe.r
dudng
aa
f-4
;;'{Lt;::t":'itf
,11,1,','{
8R.16