Re: I can't find the ABS Brake Module and Pump on my 1998...
It is under the battery ( good place huh) get to it through the driver side wheel well. Remove tire and plastic in the front. You can see it from underneath. I just replaced ALL brake lines and fuel lines on my 98 Malibu
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Jesse, The module will not stop fluid to rear brakes, a bad master cylinder will,leaking lines, air in brake system, faulty metering block if equipped, collapsed flex lines or pinched brake line faulty caliper or brake cylinders,etc. will cause the possible feeling of no rear brakes.
(ABS Module components) the ABS speed sensors and the ABS control module . When the brake is applied, the ABS control modulereads the speed data from the speed sensor and sends the correct pressure to each wheel to prevent any wheel lock up, eg. sliding/skidding Links below have more info. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
do what is called a gravity blead. open all bleeders slightly and do not let the master cylinder go dry. after this start at passenger rear then drivers rear, passenger front then drivers. if this does not help you must bring the car in to a garage for abs bleeding and/or new abs module.
you could have a master cylinder leaking that won`t always show an external leak.you may also have an internal abs hydraulic module leak,you can check the master cylinder by having someone push on the pedal and cracking the lines loose and the fluid should spray out under alot of force,if not then the seals internal of the master are not doing their job.also by unbolting it from the brake booster and pulling it away from the booster and look at the rear of the unit to see if it is damp or wet if it is then it should be replaced.you don`t have to remove the brake lines to check this.if the master checks out good then i would say you have a bad abs module.
This is your electronic brake control module(ebcm).This is the module for the anti-lock brake system.The module is located on the inside of the frame just below the drivers seat area.The problem is the electrical part of the module.This is the top part of the module and you don`t have to disconnect any brake lines.It also isn`t in the easiest of places to work in.The 4 screws that hold it down are torx head screws and being in the area that they are in it can be difficult to remove because of rust.The other thing is this module is not cheap.If you don`t want it to drain the battery and don`t want to fix it right away then you can just remove the abs fuse in the under hood fuse panel.But you will not have anti-lock brakes.Just the regular brake system.If you do decide to replace it make sure you clean the area very good before starting because you don`t want dirt to get into the module when you take off the top part.Remember do not undo any brake lines.The fuse is a maxi fuse this means it is one of the big ones.Hope this helps.and let me know if you have any more questions.Good luck.
Locate and pull the ABS pump fuse located in the power distribution center under the hood and CHECK IT TO SEE IF THE FUSE IS BAD. Basically you are looking for a fuse box with large amperage fuses and some relays. Look along the fender well in the engine compartment relatively close to the battery. It is a 60 amp fuse in most instances and should be clearly labeled "ABS" in the large fuse box with other similarly oversize fuses used for other high power subsystems. All ABS systems are designed so that the solenoid valves in the ABS brake manifold are in safety "bypass" mode when powered down or when the ABS control module has been removed. You will have standard everyday power brakes no different than brakes built without the ABS system. The ABS system will perform a self check once you exceed 5 MPH and the "ABS" and "brake" lamps should turn off. During this test, the controller runs the pump motor and briefly operates all of the valves. This ABS "self-test" is performed every time you start and drive. EBCM is short for "Electronic Brake Control Module" It is the advanced computer than controls the electric motor pump and valves of your ABS system. Burnout of the motor is very rare however. A MOSFET transistor in the EBCM (Electronic Brake Control Module) has failed, can cause the pump not to perform. Pump motors generally do not fail, but when they do, the culprit is usually worn-out brushes or corroded electrical connections. In a worst-case scenario, your motor is beyond repair. It is bolted directly to the hydraulic assembly- a cast aluminum brake fluid distribution hub with 5 or 6 brake lines branching off of it and wiring harness. I hope this helps before you get your hands to dirty. In short check all the electrical connections first. Try running a hot wire to the pump motor first to see if it runs and if it does, then it's not the motor and could be a easier fix by changing the (EBCM).