What is the ABS pump computer bleeding procedure?
3 Answers
The bleeding sequence is: right rear wheel, left front wheel, left rear wheel, right front wheel. Unscrew the reservoir cap and fill it with brake fluid, being careful not to spill any on painted surfaces. If spilled, clean immediately. Connect the bleed hose to the wheel cylinder bleeder screw, with the other end inserted into a container holding some brake fluid. Connect the diagnostic tool's plug to the diagnostic socket. Press the "YES" button to activate the return pump rotation and close the solenoid valves. Press YES again. The motor should not run for more than 60 seconds. Repeatedly pump the brake pedal while loosening the bleeder screw until no air bubbles emerge.
When repairing the car's exhaust ABS pump computer system, the usual approach is: park the car on level ground, safely lift the wheels with a jack, and ensure stability. Ask a friend to help press the brake pedal from the driver's seat while I operate the exhaust tool. Start bleeding from the right rear wheel because air tends to accumulate there. Open the bleeder valve on the wheel, release air while the brake is pressed, and close the valve when bubbles disappear. The ABS computer part needs to be activated to completely bleed the system—I start the engine and use an OBD diagnostic tool to trigger the pump to run for a few minutes, circulating the fluid internally to remove any trapped air. Throughout the process, the brake fluid reservoir must remain full to avoid drying out and introducing new air. Before finishing, check all wheels and ensure the pedal feels firm with no signs of sponginess. This job requires patience and teamwork—wear gloves to protect against fluid corrosion, and never overlook safety details.
The ABS system bleeding, especially the computer-controlled part, is quite sensitive. I don't recommend beginners to attempt it themselves, as incorrect operations may introduce more air and cause brake failure. The steps include pressing the brake pedal, bleeding, and activating the ABS pump, the latter of which usually requires a professional diagnostic tool to trigger the pump for bleeding. I've seen DIY cases fail outside, such as the ABS light turning on or brakes becoming ineffective. It's best to go to a reliable repair shop where they have complete equipment to ensure safety. If you insist on trying, make sure the car is stable and work with two people: one to press the brake pedal and the other to open the valve, starting from the rear wheels for bleeding. After starting the engine, try to let the pump run for a few minutes. Throughout the process, ensure the fluid level isn't too low to prevent leaks from dirtying the car body. Wear goggles and gloves, as brake fluid can harm the skin—don't neglect personal protection.
