TL180-type bulldozers and ZL50C-type loaders are used to push the gas-oil brake system, the disadvantage of this approach is that the brake cylinder piston and casing prone to corrosion, jamming and other failures. When the brake cylinder piston and the casing appears rust, stuck, usually the piston removed, remove the rust with sandpaper and clean, dry, re-installed after the restoration of the machine's braking performance. But often in maintenance, because they can not find the right focus, the piston can not be removed from the case of the sub-pump, so that corrosion, increased stagnation, removal more difficult. According to the author's practical experience, it is recommended that the manufacturer make the following improvements when processing the brake cylinder: Method 1: Drill a top wire hole that is on the center of the piston in the sub-pump casing, Top wire seal, with a nut lock. In this way, when found that the sub-pump pistons appear rust, stuck, you can loosen the lock nut, screwed into the top wire, you can eject the sub-piston. Method Two, in the top of the lumen of the splitter piston, weld an appropriate ring (the ring can not be higher than the lower end surface of the piston). In this way, the piston can be disassembled into the ring and the piston can be pulled out. Split pump piston corrosion, stuck and unable to successfully remove the more common maintenance problems, hope to arouse the manufacturers attention and to be improved.