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Begin OCR Text:
and dirt particles and should be ca_rried out in con- As soon as any part of the system has been remov-
nection with the complete reconditioning of the ed, bleeding must be carried out. Air can also enter
hydraulic system and a new fitting. the system if there is too small a quantity of brake
When complete reconditioning is being carried out. fluid in the container. If, for e_ample, only a wheel
the brake service un it (see Group 5O) can suitably brake un it has been remoued. it is usually sufficient
be connected to the master cyl inder and then the just to bleed th is. If. on the other hand, the master
system emptied through the bleeder nippIes. The cylinder or its lines have been removed, the entire
system should therefore be flushed with spirit. after brake system must be bIed.
wh ich it should be blown clean with com Pressed When bIeeding or other sim ilar work is being carri-
air. When such a recondition ing has been carried ed out. no brake fluid must be permitted to get on
out. the components of the hydraulic system shou Id to friction surfaces or l inings. Do not spil l any fluid
be taken out and checked to ensure that any dirt on the paintwork as this may damage it. If the ve-
and flush ing fluid have been effectively removed. hicle is to be placed on props du ri ng fhe bleeding,
N.B. With regard to requirements concerning the the rear end should be somewhat higher than the
cleaning agent, see the general instructions. Group front end.
5O. Do not top up with brake flu id which has been When filling with oil observe the foIlowing ; The
drained from the system. brahe fluid must meet the requirements accord-
ing to SAE 7O R 3. Brake fluid with the later desig-
nation SAE 7O R 3 (l7OB) or SAE l 1 7O3 can also be
_ used. Brake oil which has been bled out of the
REPLACING BRAKE Ll NES t t d _ t b t b _
sys em mus un er no circums ances e pu ac
If leakage oCCurS or if the brake lineS have been into the b_eede_ unit or the containe__ .
e_posed to such e_ternal damage that leakage or
blochage can resu It, the damaged lines should
be repIaced according to the instructions given
be_ow BLEEDl NG WITH BLEEDER U N I7
' 1 . Check to make sure there is fu Il return on the
1 To prevent unnecessary spilling of brake fluid.
' brake pedal and that neither mats nor suchlike
the e_isting fi l Ier cap on the master cyIinder prevent full travel (about 1 52 mm = 6'') from
container should be temporarily replaced with being util ized during the bIeeding Depress the
one without a vent_hole '
' brake pedal several times to even out any un-
2 Clean foUnd the ConneCtionS and remove the derpreggure in the gervo cy__nder and in th_g_ damaged brake line. way digconnect it.
3. Take a compIetely new brake line. blow it cIean
internal Iy with moisture-free filtered compress-
ed air and fit it. Make sure that the brake line
lies in such a position that it does not chafe
while driving. Particularly important points are
where the pipes pass the steering rod, where
they must not come nearer than 1 O mm (3J8'').
If a pipe is not bent correctly. it should be
adjusted manually before being fitted.
Bending a pipe already connected offen results
in deformation at the connectiong. Do not for-
get the clips.
4. Bleed the brake system according to the in-
structions given below. Fit the filler cap with
vent-hole on the container.
B LEE D I N G TH E HYD RAU Ll C SYSTE M
A sign that there is air in the system is that the
brake pedal can be depressed without any appreci- Flg. 542. Pedal tra_el
able reSi StanCe or if it feeIS Spongy A ___ (6..)_ _ =appro_. mm f. 25
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