abs

ABS system failure Automobile anti-lock braking system that is ABS, the device when it comes to brake the case, according to wheel speed, automatically adjusted the size of the brake pipe pressure, so that the wheels are always rolling in the side edge of the slip locking state, In particular, the emergency brake, it will intermittent brake, which brake - release - brake to avoid hazards. Anti-lock brakes, 6 to 10 times per second frequency of the brake - release - brake pulse brake, intelligent electronic control instead of manually, to prevent the wheels from locking, so that the wheels always get the most braking force, and keep to flexible. Wheels from locking when to reduce the braking force, while not locking the wheels when braking force has increased, and so forth action, the best braking. Use of the device can reduce the braking distance, steering control to ensure that the braking process is still valid. In particular, emergency braking, the tires can take advantage of peak adhesion, improved vehicle anti-skid capability to shorten braking distances, full braking performance. Use, if the ABS system failure warning light will light up, have to stop in time handling or repair. Common ABS system troubleshooting as follows: 1, ABS ABS system pressure relief system to vent the general approach is: the ignition switch is off (turn OFF), then repeated the brake pedal, pedal frequency of 20 times or more, When the pedal force increased significantly, that feel the pedal when the hydraulic power, ABS pressure relief system that is finished. The following components are usually required to repair pressure relief: the hydraulic control unit of any equipment, accumulators, electric pump, solenoid valve, brake fluid tank, pressure warning and control switches, rear-wheel distribution ratio valve, rear brake points pumps, high pressure front brake wheel cylinders and brake fluid and tubing. 2, ABS system, the computer's normal computer replacement car instead of the original computer, observe the work of the ABS system, by comparing the original car computer to identify whether the failure. Replacement when the ignition switch off, remove the computer's wiring harness plug, put the normal computer, plug in all the wiring harness plug, turn the ignition switch. Then start the engine, the red brake light and ABS light should display the normal state. 3, wheel speed sensors to adjust the sensor plug dirty sensor, the sensor does not meet the requirements of the air gap will cause the sensor working poor, and should be adjusted in order to restore normal operation. Paper may be used to adjust the sensor head gasket closely aligns the sensor end to complete, when the vehicle is running, along with the rotation of ring gear sensor, paper pads will disappear. Adjust front wheel speed sensor (ABS, for example in Tanzania Fu style): Lift car, remove the corresponding front tire and wheel device, loosen (tighten the head) bolts through the fender hole split disc brakes under the sensor head, clean the surface of metal or dirt, and scratch sensor head end, the sensor head end paste a new paper gasket (do an "F" mark that round), pad thickness of 1.3mm Loosen the sensor bracket bushing bolt, rotating bushing, to provide a new bolt lock notch surface, through the fender hole disc brake, put the sensor head on the bracket bushing Make sure the paper gasket attached to the sensor head side surface, and the installation did not fall, re-installed on the sensor after contact with a good connection. Promote the sensor head moves to the top of the sensor ring, until the pad contacts with the ring gear so far, with 2.4 ~ 4N · m of torque tighten the bolts firmly fixed, so that the sensor head position. Replace the tires and wheels, and put down the car, start the engine road test, ABS malfunction indicator light does not shine for the system to normal, the sensor is good. Otherwise, ABS system is still failure, which requires further inspection. Adjust rear wheel sensor: sensor to adjust the same with the front wheel. Lift car, remove the rear wheel, brake caliper, gear and sensor head, clean the surface, in the end Tiezhi sensor head gasket (marked R), 35 foot computer ABS paper gasket thickness of 0.65mm . Re-installed sensor head, tighten the bolt, push the top ring sensor head to the sensor moves to pad up contacts with the ring gear, to maintain this state is 2.4 ~ 4N · m torque tighten the bolts firmly fixed, so that transmission sense of head position. Replace the copy moving clamp, the wheel, put down the car, the final road test. If it is found the work of bad wheel speed sensor, the application of digital multimeter to measure the resistance of the coil. Much resistance circuit, resistance is small for the short, need to replace the sensor head. 4, the hydraulic control unit of the hydraulic control device maintenance before the overhaul, according to general method relief. Demolition hydraulic control device, unplug the solenoid valve, remove the O-rings, lubricated with clean brake fluid valve O-ring, fitted well with the performance of electromagnetic valve, with 4 ~ 5N · m torque alternately tighten bolts, fixed solenoid valve, plug wiring plug. 5, ABS ABS system replacement harness connector poor contact, wiring harness corrosion, fracture and damage to the external shielding, will lead to anti-lock brake system does not work, must be replaced. Harness plugs are usually replaced together with the wiring harness, wiring harness plug is damaged individual can be replaced with new plugs, ground the shield wire firmly to field welding, wiring harness plug is a plastic, generally can only be replaced together with the wiring harness. Harness plug must fit snugly to prevent poor contact, connector plug, the pins inserted the card. 6, ABS system, the deflate any air in the ABS system, would seriously interfere with the brake pressure regulation, leaving the ABS system, loss of function, not working properly. In particular, the ABS for maintenance and repair, according to the "maintenance manual" provisions of deflation. 7, hydraulic components, hydraulic components leak inspection leak inspection, turn the ignition switch until the pump stops running, then wait for 3min, the entire hydraulic system is in steady state. Check pressure gauge, if the system pressure drop within 5min, indicating leakage of the hydraulic system of the Department. Hydraulic components and then check the leak itself, or its external system leaks are repaired, if necessary, replace worn parts or assembly.