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A u x _ ) ___ _ _ A _ y B _ A K E _ y _ _ E _ G RO U P 54 D E_ _ R l __ l O N t I g 1 g ' _' l P_I_ / ' /_'_ ' _l'I l ' _ l . i _. _ (3 (l _ _ __ . i _ /'_ ' _ i , i, ,___p_ _ / ___J ( _' l _ _ , ' _i , _y_ ì _ í ,_ , ' _ _ 2 o 2 1 2'2 2 3 2 _ Z 5 2/6 2 7 28 29 3o 31 3'2 33 3 _ 3 5 3_6 3 7 VOLVO l O_'446 Fl$ _7O. Se_o cyllnder l Attaching bDlt for 8 Guide sleeve l6 Guide 24 Reaction d_sc 32 Attaching screw master cylinder 9 Rear vacuum chamber l7 Reta_ner 25 Valve piston 33 Value spring 2 Cylinder l O Reta_ner l8 Filter 26 Stop washer 34 Return apring 3 Front vacuum chamber l l D_aphragm t9 S_lencer Z7 Washer 35 Rubber cover 4 front thrust rod l 2 Guide housing 2O Vacuum inlet 28 Guide housing 36 Waaher 5 Retainer l3 ValvE piston seal 21 Spaling ring 29 Valve gUidE 3T Rfar thrust rod 6 Diaphragm 1 O Seal_ng ring 22 Return spring 3O End 7 Sealing ring l5 Seal 23 End 3l Value plate S E RVO CY Ll N D E R Th_s _s a mechan ical tandem-type servo dev_ce lo- cated between the brake pedal and the master cy- l _nder, see F_g 5_6 Due to the servo cyl_ nder, which is assisted by vacuum from the eng _ne _ nlet duct, less pedal pressure _s req uired when brak- ing The construction as wel l as the designat_on and locat_on of the parts are shown in F_g 5_7O The servo cylinder funct_ons as fol lows When the system is at rest, the parfs of the servo cyli nder are in the pos_t_on shown in Fig 5-7 1 The thrust rod spr_ng holds the thrust rod and the valve p_ston fle_ibly connected to _t pressed to the right Movement _s limited by the stop plate In th_s pos_- f_on the valve plunger keeps the valve lifted from r _ _ voLvo ' - _05 d4q the seat _n the guide hous_ng, and this closes the Max partia_ vacuum Atmosp_eric pressure a_r Channel and openS the vaCUUm Channel ThuS an Fig t__I. ReDt poDition 5_29
 
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