be prevented from entering the conduit 15 the master cylinder 14 and brake cylinder 14 because the brake cylinder 16 is connected to the master cylinder 14 via a conduit 15 a distance can be bridged between the braking location at the brake cylinder and the operating location at the master cylinder 14 this allows the hydraulic brake system to be operated from any desirable place in the agricultural baler particularly a designer has the freedom to place the lever 9 and master cylinder 14 wherever it is comfortable for the operator of the agricultural baler the brake cylinder 16 is arranged in an engaging relation with an element 7 of the plunger drive mechanism this element 7 can be a disc that is intentionally connected to the plunger drive mechanism for the purpose of stopping the latter alternatively this element can be an element of the plunger drive mechanism such as the flywheel 2 fig2 shows an example where the brake cylinder 16 acts on the disc 7 at one side of the disc 7 at the other side of the disc 7 a compensation block 17 is provided so that when the brake cylinder 16 acts on the disc 7 the disc 7 is caught between the compensation block 17 and the piston of the brake cylinder 16 alternatively the brake cylinder 16 can be formed with a dual brake cylinder structure where two cylinders are arranged at opposing sides of the disc 7 to.