If necessary, stem measurement (e.g. if all wheels are partially released) Disconnect the brake master cylinder from the vacuum booster. Start the engine and bring the engine speed to 4000-5000 min-1, then quickly release the throttle pedal. Repeat this operation 2-3 times to create a vacuum in the vacuum booster, after which, using a template, measure the protrusion of the rod. It should be 1.25-0,2 mm (see fig. 193). If necessary, adjust the protrusion of the stem by changing its length with the adjusting bolt.