1984 Citroen CX brakes

Downloaded from www.Manualslib.com manuals search engine HYDRAULIC SYSTEM SUP.PLY DIAGRAMS
Source of pressure
I
h-Front suspension
Safety “‘lve ; Rear suspension
I
I Brake valve
i :ure limiter-
1
Front brakes Rear brakes
Source of pressure
I
Brake cccumulator
Supply to
I-way wion - steering governor
/Front
Safety va1ve- Rear suspension
I
Steering ( supply to slide-valve and operating cylinder )

Downloaded from www.Manualslib.com manuals search engine Source of pressure
Safety ialveYFront suspension
t
L Rear suspension
I I
Brake valve w Brake pressure limiter w Rear brakes
I t
Front ‘brakes
Source of pressure
I
Brake accumulator
I
3-way union F Brake valve w Front brakes
Supply to steering governor
Safety I
va1ve y Rear suspension
I
Steering ( supply to slide-valve and operating cylinder )

Downloaded from www.Manualslib.com manuals search engine BRAKE VALVE
B. 45-8 a
Overflow return Rear brakes Front brakes
1. Snap ring
2. Spring
3. 1’ 0” ring
4. Plug
5. Thrust washer
6. Rear slide-valve
7: Front slide-valve
8. Spring
9: Thrust cup
10. Circlip
11. Rubber protective sleeve
12. Securing bush
13. Snap rings
14. Rubber damper
NOTE If the brake valve is not fitted with an external overflow return, it is incorporated in the operational
return ( Return to reservoir ).
WARNING Three types of brake valve fitted with a single return system incorporated in the operational return
have been used.
= is/
/it/i//g brake valve painted green with overflow pointing upwards
= _)IIII
fi/tirlg : brake valve with green paint mark, and overflow pointing downwards
_ i1.d
/it/i,l~q’: brake valve with green paint mark on L H side and overflow pointing downwards
I. CHARACTERlSTlCS
Main braking system :
- Disc brakes on all four wheels with r~u/iln/ct/ tlisrs at the front ( Sn/oo//~ I
front and rear ( I:sIN/~ s i
- Four pistons per brake unit. at the front
- Two pistons per brake unit, at the rear
- Power operated hydraulic control ( brake valve incorporated in system )
z The front braking system is supplied by the main accumulator ( c,~l~icI~~.s
rli/ll vrn~l//~/ SIC criug J or by the
the brake accumulator ( I’orr,< J’
s/ccrivg rc,/~iclc,s 1.
- The rear braking system is supplied by the rear suspension. and is fitted with a brake pressure limiter cn
I:SIUI(J vehicles
-
The inner half-unit at the front is in one piece with the swivel.
- The outer half-unit at the front is removable.
Handbroke ( Emergency brake ) :
w
Independent from the main braking system.
- Two independent brake pads acting on front discs.
- Ratio
- cx 2000 - 2 197 j ___._....._..._..._.........,............................................................................... 101 1
- All CX vehicles 2 1’j75 -
. . . . . . 123 1
Total braking area :
- Main braking system : 316 dm2 - 48.98 sq.in ( Snloor~s ) or 365 cm2 - 56.57 sq.in f f:sfrffcss )
v
Handbrake ( emergency brake ) 49 cm2 ( 7.59 sq.in )

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 450-00 : Ch nrnclcrislics ortd sp~~c-i~l (c~c~trlrc>s 01 the hokiug S SI~IN Op. MA. 450.00 5
A brake pressure limiter is fitted to the rear braking system on Estate vehicles.
Its object is to vary the maximum
pressure in the rear braking system as a function of the load imposed on the rear suspension and the pressure in
the front braking system. It is secured horizontally on the front subframe, behind the safety valve.
L 45-6
Rear brakes Air-chamber
A
Front brakes
Rear brakes Air-chamber
A A --
7 Front brakes OPERATION
* I
f Vchtclcs - ‘I/]‘,?(, i
The brake pressure limiter consists mainly of a
slide-valve, the positions of which allow or do not
allow the supply of fluid under pressure from the
brake valve to the rear brakes.
The ends of this slide-valve are submitted to the
action of two forces
- Force F
exerted by the fluid under pressure in
the rear suspension.
= Force R
exerted by spring ( 1 ) and increased by the
value of force Fl
exerted by the front brake fluid
pressure during braking action.
a) \‘~~I~i~-/~~s irt Ilte t( lorl r /tr,.silioti f t/o /trc~.s.surc’ )
Under the only force R,that of the spring. slide-valve
is in the position indicated in figure 1. The fluid
cannot pass from the brake valve to the rear brakes,
( and vice-versa ).
Force
F exerted by the rear suspension pressure
is greater than Force R
exerted by the sprinq.
The slide-valve is in the position indicated by
Figure 2. which allows flow of fluid from brake
valve to rear brakes ( and vice-versa ).
c ) Vvhiclc il2 ntotior/. rr,ith 111~’ broke pednl ncl~~fit~~c/ :
Fluid from the front brakes exerts a Force Fl
which is added to Force R exerted by the spring.
When these two forces are smaller than force F,
slide-valve is in position shown in Figure 2.
The rear brakes are supplied.
When these two forces are greater than Force
F,
slide-valve is in the position shown on Figure 1.
The rear brakes are not supplied.
NOTE Fl
+ R -b F is true, when the pressure
in the front brakes + 28 bars ( 406 psi ) becomes
greater than the’pressure in the rear suspension.
When F
increases, Fl increases. Consequently,
maximum pressure in the rear brakes increases.
In order to avoid a sudden cut-out of the supply
to the rear brakes, a ball-valve slows the flow
of liquid from the front brakes. The action of this
valve is increased by the fact that an air-bubble
trapped in its chamber, secured at the rear of the
front subframe upper.crossmember on the L.H. side,
has to be compressed. Once the slide-valve has
started moving, the supply of fluid is not slowed
down, and it then flows through the by-pass channel.

Downloaded from www.Manualslib.com manuals search engine FIG. 1
Supply to brake valve Rear suspension
i
Filter
\--Iii
I
Rear brak
. .
One-way valve
I units
Rl
Feed to brake valve F Rear suspension /
One-way valve II Rear brake
Rl Fl
units The brake pressure limiter consists mainly of a
slide-valve, the position of which allows or does
not allow supply of fluid under pressure from the
brake valve to the rear brakes.
-
one end of the slide-valve is constantly subjected
to the pressure of the rear suspension fluid ( which
varies according to the load )
- the other end of the slide-valve is subjected to
force Rl,
increased during braking action by force Fl
exerted by the fluid under pressure from the
rear brakes
a)
Vvhirlc, irl the n IOU N positiolt (,,o /)rc,.ssurc, )
.Under the action of force Rl alone, the slide-
valve is in the position shown on Fig. 1.
The fluid cannot flow from the brake valve to
the rear brakes.
On the other hand, the one-way valve allows fluid
to flow from the rear brakes to the brake-valve.
Force F
exerted by the rear suspension fluid under
pressure is qreater than force Rl
produced by the
spring. The slide-valve is in the position shown
on Fig. 2 which allows fluid to flow from the brake
valve to the rear brakes and vice-versa.
Fluid flowing from the rear brakes, exerts a
force Fl
which is added to force Rl produced
by the spring.
H~prc 6
CNt’Out 11
At the start of the brake pedal movement, force Fl
being still very small, we have Fl t Rl < F. The
slide-valve allows liquid to flow to the rear brakes.
Aitcr t( CIIIW~~ H
Force Fl
having increased, and being added to
Force Rl,
we have Fl + Rl> F. The slide-valve
interrupts the flow of fluid to the rear brakes.
The (( easing )) of the braking at the rear is then
allowed to proceed via the one-way valve.
NOTE : Fl
+ Rl> F is true when the rear brake
pressure + 28 bars
( 406 psi ) becomes greater
than the rear suspension pressure. If F
increases, Fl
Increases as well until cut-out occurs.
Consequently, maximum pressure in the rear
brakes increases.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 451-O : Uwckirrg the hrflkv rov,~o,rrnts Op. MA. 451.0 1
CHECKING THE RUN-OUT OF THE BRAKE DISC -
FRONT BRAKES REAR BRAKES 2
E Equipment required :
,,, - 1 universal dial gauge bracket ( 2041-T or 5602-T )
1 dial gauge 2437-T
3 screws, hex. head
6 = 12 mm, thread pitch 1.25, length = 30 mm )
( Ex Crown wheel securing screw on (< D a)
vehicles ). Method :
1. Raise vehicle and assemble equipment as shown
above.
Tighten the three screws (
- ) to opproximo
My 70 mN i 7 m.kq ) ( 50 l/2 ft.lh ).
2. .Sl,l did g”“g” rod RS pwp<‘il~cl,l171 ns p”ssibl<~
10 &SC iorr. The run-out thus registered must not exceed 0.2 mm.
If this condition cannot be satisfied the disc must
be chanqed.

Downloaded from www.Manualslib.com manuals search engine Op. MA. 453-O 1
I. BLEEDING THE BRAKES ON SALOON AND ESTATE VEHICLES ( 9/1976- )
A. FRONT BRAKE BLEEDING
NOTE : To avoid emulsifying the fluid
and the
consequent formation of air-pocket in the system,
the circuit should not be under pressure when this
operation is carried out.
1. Release pressure in circuits :
a) Raise front of vehicle (wheels free 1.
b) Slacken pressure regulator bleed screw ( 1 ).
Remove front wheels.
c ) Place CI transparent tube over each bleed
screw (2 ) with its oiher end in CI clean
container.
d) Hold r/on,,,
brake pdnl ar,d loose,, blvcrl
*cr(Iws (2). 2. Bleeding :
(I 1 Start engin’e (idling speed 1 and maintain brake
pedal fully depressed.
b) Tighten pressure regulator bleed screw and
allow fluid to flow until bleed tubes ore
free of air bubbles.
Then tighten bleed screws (2 ).
c) Release broke pedal and remove bleed tubes.
Check the bleed screws for .leaks by depres-
sing brake pedal to fullest extent.
Stop engine.
Fit rubber protectors over the bleed screws.
d 1 Replace front wheels and lower vehicle to
the ground.
B. REAR BRAKE BLEEDING
3. Release pressure in circuits
a) Set monuol height control to lou posi/iou.
b 1 Slacken pressure regulator bleed screw ( 1 )
c) Wait until vehicle has reoched.its lowest
point.
Raise rear of vehicles (wheels free )
Remove lower rear wheel panels and rear
wheels.
d 1 Set manual height control to
hifih positior,
e ) Place Q transparent tube over each bleed
screw with its other end in (I cl&n container.
f ) Open bleed screws (3 ) and depress broke
pedal to fullest extent. 4. Bleeding :
(I) Tighten regulator bleed screw ( 1 1.
Slur/ w?@nr, holding broke pedal depressed.
b) Allow fluid to flow until no bubbles appear
in tube.
Then tighten the bleed screws.
Release brake pedal.
c ) Remove tubes. Check the bleed screws for
leaks by depressing the bloke pedal to
fullest extent. I
Fit rubber protectors.
Stop engine.
5. Refit rear wheels and detachable panels.
Lower vehicle to ground.

Downloaded from www.Manualslib.com manuals search engine 2 OPERATION N” MA. 453-O : (./ ‘cc ,,,g md ndjaslisg I/w hsdrmlir hrnkr rev/m/
k.
II. BLEEDING THE BRAKES ON ESTA ,TE VEHICLES (- 0 ,970 )
A. BLEEDING THE FRONT BRAKES AND THE AIR
CHAMBER ( 1)
NOTE
This bleeding must be carried out with no
pressure in the system
in order to avoid any emul-
sifying of the liquid. and consequently the possible
formation of air bubbles in the system.
1. Release pressure in the system :
a 1 Raise front of vehicle ( wheels free ).
b ) Slacken release screw (3 ) on $ressure requlo-
tor. Remove the front wheels.
c 1 Place on each bleed screw ( 4 1 a transparent
tube wi!h its other end in a clean container
d ) ,Mnir,lnh, brnk L p&d /u//y d<~pwss,~d. and
slacken bleed screws (4 ).
e) Remove air chamber ( 1). Place a transparent
tube on the end of pipe (2 ).
2.
Bleed the br.kes :
a) S/or/ ~v,gir,c,. C id/ivg spevd I md vrnialni,r
hrnk L firdnl. tullr d,~pwss<~d
b) Tighten release screw on pressure regulator.
and let fluid flow until there are no more air
bubbles in the bleed tubes.
Then tighten the bleed screws.
c) Release broke pedo1, and remove bleed tubes.
d) I:;/ nir rhnmhrr ( I ) nltcr hnr~htg /dorm i/
Ibrouph I, i/h Nmp IPSS ?,I nir.
e ) Check bleed screws and air chamber ( 1) are
properly sealed
by fully depressing brake pedal.
Stop engine. Place rubber protective caps over
bleed screws.
f 1 Fit front wheels and lower vehicle to the ground
B. BLEEDING THE REAR BRAKES
3.
Bleed the rear brakes :
a 1 Raise rear of vehicle ( wheels free ).
Remove removable panels and rear wheels.
b) Place manual height control lever in c high
posi~im H ( Release screw on pressure regula-
tor tightened 1.
c) Place on each bleed screw ( 5) a transparent
tube with its other end in a clean container.
Slacken bleed screws (5).
d) nlfliuiniv broke pcdfll ~yrrlly depwssvd. ar,d s/or,
vspiuv C idiivg sprcd ).
e) Let fluid flow until it is free of air bubbles.
Then tighten bleed screws.
Release brake pedal.
f ) Remove bleed tubes.
Check bleed screws are propeily sealed by
fully depressing broke pedal.
Fit rubber protective cops.
Stop engine.
4. Fit rear wheels and removable panels
Lower vehicle to the ground.