Modern automotive ABS pumps are far more than just a simple pump, they are a highly complex and self-contained ABS control system that has been steadily condensed over the years into a single small unit. Back in the early days of ABS, the main components needed for the ABS (Anti-Lock Braking system) to function would be distributed around the vehicle, with the pre-charge ABS pump located somewhere near the brake booster, the ABS hydraulic unit attached near the master cylinder and the ABS module located somewhere inside the passenger compartment (commonly under the seat or behind the kick trim).
This proved to be quite a cumbersome set-up with components for the same system placed in different areas of the vehicle also requiring a much larger wiring harness to connect them all. However, in order to save weight, space and make vehicles more efficient, modern ABS units are a combined system unit, often referred to as just the ABS Pump but they actually comprise of 3 main components…
The ABS module is the controller of the whole ABS system. It is the black box that is bolted to the top of the ABS unit, it reads wheel speeds, vehicle acceleration, braking effort, brake fluid pressure, longitudinal and lateral acceleration and messages transmitted from the engine and gearbox systems. This ABS module then calculates the exact amount of braking force required for each wheel during emergency braking conditions and controls each wheel by operating control solenoids within the ABS hydraulic block. The ABS module is common for failing and causing communication problems, internal control module fault codes or sometimes causes the ABS motor to run continually.
ABS Hydraulic unit.
The hydraulic unit controls the brake fluid pressure for each road wheel individually. When the ABS module activates one of the solenoids to shut off or advance pressure through a channel within the block, this action closes one pintle valve at a time within the hydraulic block to either prevent, lock on or allow applied pressure to each road wheel in turn. The hydraulic block contains the pump that is used to generate the pressure required to lock and release each wheel at high speed intervals. This Hydraulic unit also contains the pressure sensor that is used to monitor the braking pressure applied by the driver. ABS hydraulic units are common for failing and causing fluid leaks or pressure sensor failure.
The ABS motor is attached to the bottom of the hydraulic unit and is used to drive the pump within the hydraulic unit, the motor is only activated during emergency braking by the ABS module. If your ABS motor is running constantly then this indicates a fault with the ABS module being shorted out internally. The ABS motor is common to fail due to water ingress or from internal component breakdown.
Test and rebuild.
When sending your ABS pump for test and rebuild it is best not to separate the unit, ensure you send the entire unit when possible as this will aid in the diagnostic process and ensure all faults are corrected. All ABS units are tested on our bespoke HIL (Hardware In-the-Loop) test rigs, we are able to run the ABS unit as if it were on the vehicle simulating all wheel speed and driving load conditions. Once confirmed as faulty we then rebuild your ABS unit with components that are higher rated than standard, then once fully rebuilt we re-test your unit to ensure it runs within all manufacturers specifications.
Most modern ABS pumps are pre-coded at manufacturer, during test and rebuild all programming information is retained so the unit is ready to go once re-fitted onto the vehicle.
We test, rebuild and supply these ABS pumps to franchise main dealers and specialist workshops all over the globe. Our stringent quality control standards ensure that our work defect rates are minimal, our current work defect rate is less than 0.6% so you can be assured of our very high standard of work.
How do I get my unit rebuilt?
What if I don’t want to pay up front?
This is not a problem, if you prefer this option then follow the following steps:
If you require further information regarding this ABS pump and module then please contact us.