How exactly does the ESP work?

So, es handelt sich definitiv um ein anderes Steuergerät (da die Motorleistung möglicherweise auch gedrosselt wird), aber ist das ABS-System ansonsten identisch oder wird ein anderes verwendet? How is it registered whether the tires are slipping?

kenny wrote:

So, es handelt sich definitiv um ein anderes Steuergerät (da die Motorleistung möglicherweise auch reduziert wird), aber ist das ABS-System ansonsten identisch oder wird ein anderes verwendet? How is it registered whether the tires are slipping?

First, there are two different ABS systems: active and passive.

The Passive System only regulates the braking performance to prevent the wheels from locking. The system is very easy to identify; it has a standard brake booster.

The Active System does not have a brake booster but a hydraulic pump that generates the pressure for the braking system. Therefore, this system is also able to perform a braking action without the need to press the brake pedal.


ESP can only be achieved through active system intervention, as this involves targeted braking on individual wheels.

ABS and ASR work with wheel sensors that detect increases or decreases in wheel speed. This allows it to be determined whether a wheel is blocked (if the reduction in wheel speed is too rapid) or is slipping (if the increase in wheel speed is too rapid). ASR typically only reduces engine power.
The ESD (Electronic Speed Differential) is able to brake the freely rotating drive wheel, thereby distributing the driving force to the other wheel.
For ESP, you still need a couple more sensors: two angle sensors (gyros on the A-column) and a steering angle sensor (on the steering column). These sensors can determine whether the vehicle is being driven as the driver intends or whether the vehicle is "acting on its own".

look: http://www.makkus.de/tips/wiefunktioniert/esp/

or Google is your friend

btw Bertil: I have ABS, ASR, and EDS, but still have a brake booster

See you, Gremlin

Gremlin wrote:

by the way, Bertil: I have ABS, ASR, and EDS, but still have a brake booster.

Such systems also existed - right - I completely forgot about them. But you still need your own hydraulic pump.

Since this pump can also perform the function of the brake booster, brake boosters are no longer installed in modern systems.

Well, it's not *that* old, either.

Teves Mk60, brand new


but the hydraulic pump already had very old ABS...

See you, Gremlin

Hello Bertil,

Which model year or which ABS (Bosch 5.3, Teves Mk 60...) should no longer have a brake booster?

Hi Michael,

I have one here --- It's from a Corrado (with EDS) without ABS!! Model year is unknown to me.

But right, my G4 also has a BKV, so I was wrong, sorry. The explosion diagrams for the braking systems that I have are simply omitting the ABS on the BKV (although it is actually installed), and I have assumed that it is generally omitted (like on the Corrado ABS).

Hello Bertil,

Can you please provide the part number for the braking system?
According to my records, every Corrado has a BKV.

Hi Michael,

Number, but no pictures...





could 535 614 111 be (as I suspect based on the image...)

Clearly, the pedal linkage is visible without the BKV (brake vacuum pump) in between. Next to it is the sensor for the hydraulic system. Coupling.
I've seen similar ABS units in other non-VAG vehicles before.