OPERATION No DV. 390-0 : Checking hydraulic components on the vehicle 2° ) On vehicles ——w> 3/ 1967. Block rear brake feed union (3) To check rear right cylinder, block union (2) To check rear left cylinder, block union (1) To check height corrector, block opening «a» 15. Checking the power assisted steering. a) Block, by means of plugs : - End-piece «b» on 3-way union - Opening «d» feeding the front suspension - End piece «c» on 3-way union feeding the rear suspension,