Abstract: An adjustable brake-actuating device of the spindle and nut type eliminating need of an adjusting thread includes an actuating nut driven by an actuating lever through a one-way clutch, which opens during the release stroke of the lever, and a clutch-spring encircling the actuating nut to limit the release movement of the actuating nut to an amount corresponding to the desired brake pad clearance.

Abstract: A pressure control arrangement for hydraulic brake systems including a plunger piston which is sealingly slidable with a bore and which defines a chamber connecting with at least one brake cylinder. The chamber is connected with a brake pressure source through a valve which is kept in the open position by a connection to an auxiliary pressure source which prevents the valve from reaching or maintaining its closing position when the auxiliary pressure has failed. The auxiliary pressure is controllable for effecting an anti-skid control for which purpose the auxiliary pressure source is connected with a control chamber which is opposite the valve chamber connected to at least one wheel brake cylinder through at least one auxiliary valve.