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P 1 2O. P 1 8OD 5. Check that the vacuum cylinder (24) is still clean internally. Place fhe return spring (1 6> in position. Fit tfe vacuum plunger (1 7) complefe with new rubber ring C1 4) and carelully insert the plunger rod (t 5) into the bush. Press down fhe plunger to full stroke Jength a lew fimes to check that the plunger and plunger rod do not bind. The return spring sfould press back fhe plunger immediafely when it is released. Fit on a new gasket (2O) and bolt on fhe cover <1 9) and plate (l1 ). A suitable fightening torque for the bolfs is O.3-O.4 kgm C2-3 Ib.ft.>. 6. Fit a gasket and aìr lilter element and plac' e on the cover and clamp. In the case ol a late _ productj_on a_,r f_i_ter iF_,g. 3o), ffe bo1t _is ' tightened fo a torque of O.34.4 kgm (l-3 lb.lt.>. ,o,,, After assembly. the servo brake cylinder musI '''' 'h _ be tested. Fig_ 42. Connections for testing_ 1 . Ciauge lor constanf 8. Conneclion Ior contrDl _E___H_ v8cuum vacuum l. G_uge Jor control 9. Connection tor hydrau- For complete testing, a fest bench is required to_ vgcuum _,c _,_et gether with a confrol cylinder ol a type as shown in 3. Hydraulic sfu I-oJl 1 O. Connection Ior hydr8u- Figs. 42 and 43. Tfe purpose ot tfe contro_ cy1inder Valve liC oUtlet _ t b_ t k t b bt . d d. 4. GaUge lor hydraUl_iC 1 1 . VaCuUm vaIVe Is O ena e a S rO e O e O alne COrrespOn Ing h _ t tf t f. f _d f f _ d intet pre5tUre 1 2. SWjlC Or v8CUUM pUmp O a W iC WoU oCCur wit t e serVo Cy in gr _. Ga,ge to, _yd,,u__,, _ 3. Hyd,g,_,_c _,,_et vg_ve installed in tfe vehicle. out_et pre__u,e _ 4. Hydrautic out_et v6_ve Il no testing equipmenf is available, a certain amount 6_ 5ighl g Iass 1 5_ Hydraulic pump ot fau1t d_,agnos_is can be carr_,ed out .by test_ing 7. Connection tor 1 6_ Confrol cylinder tf __ d f . t 11 d _ tf f. _ COn5tanf vaCUUM e 5erVO Cy In er W en inS a e in e ve ic e. Il testing revea Is any faulfs, fhese sfould be re- medied Bs shown in the fault tracing scheme. _ _e_tl_g o_ test _e__h Testing shouId prelerably be carried out as lollows . 1 _ Connect the vacuum line (7, Fig. 42) to the _ servo brake cy Iinder hydraul ic inlet. When . doing this. brake tluid sfou1_d natural1y be emptied lrom the cylinder. The fydraulic connections have a 3/8'' X Z4 U_F thread. Plug _ the hydraulic outlet. Sfart the vacuum pump and open the vacuum valve (1 1 ). _ When a vacuum oI O.75 kg/cm' (1 O.7 Ib/sq.in.) has been reached CGauge 1 >, close the valve _u,,v,.,o. C1 1 ), The servo brake cy Iinder should mainta_in 3 C _ _ d _ _ F_g. 4 . ontro Cy In er. a vacuum ol at least O.7 kg/cm' <1 O 1b/sq.in.> lor five seconds. Then disconnect the vacuum 1 . Connection tor tesl _. Return spri,g line and open ffe fydrau1jc outlet. bench 6. Cylinder body 2. Connect tfe se,vo cy__inder fydrau___c _in_et 2_ Connection lor servo 7. Washer f 1 g) d f d _ brake cylinder 8. Circlip jO t e jne an ItS y ra U It oUtlet to the 3 p_u,ge, q p,otect._,g cover control cylinder <1 6). 4.' _,at ' 5-1 7
 
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