③The car swerved when braking. Because loader working time is too long, surface ofbrake shoe of the drive axle is inevitably stuck with oil, so that the braking force is reduced, so that the phenomenon of car running deviation occurs when braking; There are improper brake clearance adjustment, can also cause the braking car deviation phenomenon; In addition, the tire pressure is not enough, has not met the air pressure standard, the two sides of the tire pressure is inconsistent, it will lead to the brake car deviation phenomenon. ④ Brake failure. It is mainly due to improper adjustment of brake drum and brake shoe clearance or oil pollution; Or brake friction wear beyond the limit, can lead to brake failure.