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Begin OCR Text:
H y_
D_
_ A u _ _ _ F o o _ B _ A K E _ y _ _ E _
6R_U P __
D E_ _ _ _ ___ O _
MASTER CYLl NDER
The master cyl_nder is of the tandem type _ts con_
StrUCtlOn IS ShoWn In fIg 5-33 and _tg funçt_on _s as
follows
When the system is at rest (fig 5_34), the plstons
are kept pressed back by the force of the Spr_ngs
When the p_stonS are _n th_s poSit_on the çonneç- r_ Sccondary c_r _ Primary circuit
' U CUlt pfeSSUfeleSS _ preSSureleSg
_ SecondarY circuit _ Primary circuil vuLvL_
high pressure h_gh preggure IU'l_
Fig f35 _orm8l brake 6pp__catio_
tlonS between the brake flu_d conta_ner and whee_
brake un_ts are open At the moment b_aking takes
PlaCe, the pr_mary p_ston (to the right) _s pressed _n
by the p_ston rod This closes the çonneçt_on be-
tween the conta_ner and the wheel brake un_t and
the pressure in front of the p_ston r_ges Th_g preS-
Fl9 f33_ Master cylinder sure infJuençeS the Secondary p_ston go thae _t a_so
l Container _ Co__eo_ioo for pr__ay o_rou__ d t th _ Ft Th
_ __op gorew i _eooodary p.,g_oo tS mOVe O e e e Same over-pressure ar_ses
3 E4ual_zing hole a cy_inder _n front of both p_stons (Fig 5-35), the brake f_u_d
4 Ouerflow hole g Conneol_Dn for geoonday o_rou,t F d t t th b k _
IS OrCe OU In O e reSpeCt_ve ra e ine and al_
the wheel brakes are applied, provid_ng the system
_S funct_on_ng properly If a leakage has oçcurred
In the secondary c_rcu_t no hydraulic counterpres_
SUre buìlds up in front of the secondary p_Ston _n-
stead. thls p_ston is moved inwards when the
brakes are applied unfil if is stopped by the end of
the cylinder (F_g 5_36)
_ -_ _ _- _'ji__,____'_- _,._,_x_
, gi L' l _ (
_ j'_-' _, t-_U__ i____ '
_P __-_- _ Seconday c_r _ _ prin_ary c_rLu_t
g ___O3_xY,U CUit Pressureless _ DreSSureless
eoOoday CIf_ primay o_rouil _ pr_mary o._rou__ vo_ __
CUlt preSSureIeSs pressureleS$ _j.g_ preggure i_ _
Fig h_ Rest pDait_on F 36 g
l9 5 rake appllCatlon WIlh leakagB in
l and 2 ConneCtion for brake f_u_d coo_aioer _econda_y ci_cuit f 1 7
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