Switch on the ignition and press the brake pedal lightly. Open the vent screw and let the liquid flow until ready. Close the screw and do the same with the other vent screw. Depressurize the battery by pressing the pedal 40 times with the key off.
The first thing you need to do to bleed the ABS module is to start the car or turn the key that contains the battery. Then you have to press the brake pedal. It is important that the system is previously pressurized to expel the air. After pressing the brake pedal to release the brake sensor.
Symptoms of a bad or failing ABS control unit
- The brake pedal does not respond. In some cases, depending on the vehicle model, the brake pedal may become unresponsive in the event of an ABS module failure.
- Brake pads require more force to push.
- The ABS warning light comes on.
- Lock the brakes.
Another brake bleeding process is then required to remove remaining air in the system.
- Bleed the ground brake.
- Connect the scan tool to the Data Link Connector (DLC).
- Select ANTI-LOCK BRAKING, then MISC, then ABS BRAKING.
- Release the ground brake again.
Normal bleeding methods can be used to bleed individual brake lines as long as no air has entered the ABS modulator. However, if air has entered the modulator, the system must be emptied using a pressure switch and a diagnostic device: Connect the pressure switch to the brake master cylinder reservoir.
Resetting an anti-lock brake light
If air enters the brake lines, the brake fluid cannot flow properly and the brake pedal becomes spongy or soft. If the brakes are soft or spongy, now is a good time to change or wash the brake fluid. (Bleeding the brakes uses fluid to expel air from the brake system.)
How to replace an ABS control module
Most likely, your car is equipped with some kind of ABS (anti-lock braking system). If your ABS system isn’t working properly, it can also lead to spongy brake pedals. Their ABS system is designed so that the driver maintains better control of the vehicle when stopped at high speed.
Here are the signs and symptoms of a faulty brake booster
Like most braking systems, ABS relies on hydraulic brake fluid to regulate pressure. A low fluid level in the reservoir can prevent the ABS from doing its job, causing the ABS warning light to come on. Too much air in the system is another likely cause.
If you thought the caliper brakes were being vented to remove air from the system, consider bleeding the brakes with the car turned off. Pump wasn’t the right word, but the brake booster diverts negative pressure from the engine (there’s a large diaphragm that multiplies the braking force) and shouldn’t be active.
Brake Line Air Symptoms
How to check the master cylinder of the brake system
Methods for troubleshooting ABS braking
Yes, ABS does affect the transmission. The vehicle speed sensor is part of the ABS system. Your truck reads the driving speed here. Transmission coordination is also based on driving speed and controls when the truck needs to be raised, lowered and when the torque converter needs to be locked.
In general, the standard version of most modern vehicles involves the installation and assembly of the ABS control unit in the engine compartment. It can also be present in the frame side member on the left side of the vehicle or generally on the driver’s side.
No, not only that. You have to bleed someone off the brakes to get the air out of the lines. They do this by forcing the brake fluid through the lines until the new brake fluid forces the air out of the lines.