BENDIX BW2726 Manuale Utente

The Bendix

®

 TABS‑6

™

 Adv MC module uses wheel speed 

sensors, modulator relay valves (MRVs); and an ECU to

optimize the contact between the tires and the road surface 

during a braking event where excessive wheel slip — or 

wheel lock‑up — is detected.
When a situation is detected where the system needs 

to  intervene,  the  ECU  will  activate  the  MRVs  to  apply

controlled brake pressure at the wheel ends. Depending on

the configuration of the ABS system, interventions may be

made on individual wheels, or pairs of wheels.  In the case 

of pairs of wheels, the wheels controlled by a modulator 

may be either on the same side of the vehicle, or at both 

ends of an axle.
The TABS-6 Adv MC module ECU is able to modulate the

brake pressure with greater speed and accuracy than a 

driver.

During  normal  braking  the  TABS-6 Adv  MC  module

functions as a standard relay valve. If the ECU does not

detect excessive wheel slip, it will not activate the ABS 

system, and the vehicle will stop with normal braking.

Side control uses a single modulator relay valve to sepa‑

rately control the braking on one or more wheels, on each 

side of the vehicle.
In the case of braking surfaces with poor overall traction, 

the side control ABS interventions will maintain the wheels 

on each side of the vehicle independently, at just under the 

speed where they would lock up.

Axle control uses a single modulator relay valve to control 

the wheels at both ends of a given axle (or multiple axles 

in cases where a single MRV is controlling several axles).
In the case of braking surfaces with poor overall traction 

(e.g. roads that are worn, slippery, or are made of loose 

gravel) — or braking surfaces with areas of poor traction 

(e.g. asphalt roads with patches of ice) — axle control ABS 

interventions will maintain the wheel that is not slipping at 

just under the speed that will lock the wheel.  The system 

permits the other wheel (that is experiencing slippage) 

temporary periods of wheel‑lock during the intervention.
Axle control should not be used on 5th wheel dollies or 

steerable axles.
When intervening on regular traction road surfaces, a 

system configured for axle control performs similar to a

side control, two‑modulator system.

The Bendix

®

 TABS‑6

™

 Adv MC module is designed to react 

in a fail-safe manner in the event of a system Diagnostic

Trouble Code (DTC). For example, if the ECU detects that

a sensor is not responding, an ABS system DTC will be set

and the TABS‑6 Adv MC module will illuminate the trailer 

ABS indicator lamp and revert to a fail‑safe mode where 

some, or all, Advanced ABS functions (including TRSP) 

may not function. Even in cases where the ABS system

is completely disabled, the standard pneumatic brake 

function of the vehicle will still be available, but without the 

benefits of ABS. The TRSP feature is also disabled with an

active ABS system diagnostic code.  If the indicator lamp 

is illuminated, always have the ABS system serviced at the 

earliest opportunity.

1

21

22
22

21
21

42

22

1/2" NPT Supply

Port 1

Two 3/8" NPT Delivery 

Ports 22

(To Brake Chambers)

Two 3/8" NPT Delivery 

Ports 21

(To Brake Chambers)

3/8" NPT Control Port 

with Integral Filter

3/8" NPT Load Port 42

For Air Suspension

(Plugged for Non-Air Suspension or 

Spring Suspension Sensor Vehicles)

3/8" NPT Delivery 

Port 21

(to Brake Chambers)

3/8" NPT Delivery 

Port 22

(to Brake Chambers)