Haldex Brake Systems: Anti-Lock Brake Systems

Utility Trailer
Chooses Haldex
Full Function
Air Brake
Systems

U.S. Government
Selects Haldex
Air Brake
Systems

How does the
select low/high
control work on
the Haldex Trailer
Full Function
ABS system?

Should my
tractor ABS unit
and my trailer
ABS unit be
from the same
manufacturer?

Accelerating the technology of stopping is our business. That’s why Haldex was the first company to offer a single-valve trailer ABS system (FFABS) that complies with FMVSS 121, and was on the cutting edge of ABS even before the NHTSA mandate in March of 1998.

Haldex offers a full line of air braked, commercial trailer ABS products to meet every application and requirement:

ABS/PLC

Standard 2S/1M ABS

FFABS

4S/2M ABS

Purpose:
ABS (Anti-Lock Brake Systems) are designed to improve vehicle control and stability through electronic management of service braking to avoid wheel lock-up, during all types of braking conditions, and on all road surface conditions.

Operation: The primary components of ABS are electronic control unit (ECU), solenoid operated air valves (ABS Modulator Valve), and wheel speed sensors (Sensors). The inductive Sensors are mounted at designated wheel ends in conjunction with exciter (notched) rings. The ECU (or Brain) reads electric impulses generated from the rotating exciter, as the wheels turn. The ECU has been designed to recognize when the rate of wheel speed deceleration is approaching wheel-lock (no longer rotating) which would result in skidding. During a braking event, the ECU continuously monitors the rate of deceleration so that it can intervene into the operation of the ABS Modulator Valve(s) to maintain stability during braking.
•	When the rate of deceleration approaches wheel-lock the ECU sends electrical signals to the ABS Modulator Valve(s) to reduce air pressure to the service brake chambers which reduces braking
•	When the rate of deceleration returns to a level above the wheel-lock threshold the ECU sends electrical signals to the ABS Modulator Valve(s) to increase pressure to the service brake chambers which increases braking
•	This iterative process of decreasing and increasing braking takes place in milliseconds and continues as long as the deceleration rate is in jeopardy of wheel-lock to help assure vehicle stability

Features and Benefits:

Accelerating

The

Technology

Stopping

ABS/PLC

Haldex Brake Systems has introduced to the North American trailer market their next-generation ABS product, which includes the utilization of power line carrier (PLC) technology to accommodate a single tractor-to-trailer electrical connection.

The three current Haldex ECU platforms will now be combined under (1) “PLC” ECU which will continue to operate using Haldex’ patented SLH (select low-high) software. Additional features of the new PLC platform Trailer ABS product include:

•	Standard Electronic odometer function
•	Standard 256 bytes for data storage to accommodate storage of trailer manufacturers vehicle information, operation note pad, vehicle service report and electronic manifest
•	Standard On-board diagnostic capability, via “Blink Code”
•	Optional new model Info Center Tool for remote, hand-held ECU communication
•	Optional new model Windows based PC Diagnostics for ECU communication

The Haldex PLC ECU includes a feature enhanced “PLC Plus” platform. With “PLC Plus”, the customer can begin utilizing the Trailer ABS ECU to enable and manage multiple monitoring and control auxiliary functions for various preventive maintenance, warning and operational features to improve productivity and lower cost of ownership. Depending on the customers’ specifications, the feature rich “PLC Plus” ECU offers optional capabilities such as : Back-up Alarm Control, Lift Axle Control, Lining Wear Sensing, Low Reservoir Warning, Door Ajar, Temperature Warning, and others, virtually limited only by imagination.

Standard
2S/1M ABS

Standard 2S/1M ABS

This two Sensor (2S), one Modulator Valve (1M) ABS system provides the industry with an extremely economical ABS option.
One Channel ABS System – 2S/1M – provides ABS control for up to three axles
Meets or exceeds all FMVSS 121 ABS requirements for semi-trailers and dollies
•	Optimized performance and safety
Patented SLH (select low/high) software to optimize stability and stopping distance
•	2S/2M performance and safety at the cost of a 2S/1M system
Available in either two or six port ABS Relay Valve
•	Allows for savings from labor and additional fitting expense
•	Fewer connections and leak points
Miniaturized ECU (electronic control unit)
•	Provides a lightweight assembly – 3.2 pounds – for easy installation and increased payload
•	Compact size allows easy mounting on either tank or frame
Pre-assembled unit and self-contained wiring harness with click-fit connection to the ECU for quick and easy installation
Sealed, protected ECU that can withstand extreme conditions and is fully operational in temperatures ranging from -40ºF to 176ºF
User friendly, two digit diagnostic codes
•	Allows for easy trouble-shooting without expensive test equipment
Optional odometer feature
•	Replaces need for expensive, mechanical hubodometers
Backed by our industry leading warranty – up to five years/500,000 miles.

Premium 2S/1M
Full-Function ABS
(FFABS)

Premium 2S/1M Full-Function ABS (FFABS)

This premium product offers all the features and benefits of our Standard 2S/1M ABS product...PLUS:
Industry leading, patented design
•	Accelerating the technology of stopping
Integrates the spring brake control and anti-compounding functions in a single valve package
•	Reduces installation labor & material costs and trouble-shooting time
Replaces systems with up to three valves
•	Simplified trouble-shooting and reduced down-time
Lightweight – five pounds, one ounce
•	For easy installation and increased payload
Corrosion and chemical resistant
•	Ability to withstand extreme operating conditions

4S/2M ABS

This four Sensor (4S), two Modulator Valve (2M) ABS system is a high end product, offering all the features and benefits of our Standard or Premium 2S/1M ABS products...PLUS:
Two Channel ABS System
•	Provides ABS control for up to six axles
Meets and exceeds FMVSS 121 ABS requirements for Full Trailers
•	Optimized Performance and Safety
Patented SLH (select low/high) software to optimize stability and stopping distance
•	4S/3M performance and safety at the cost of a 4S/2M system
Suitable for spread axle, lift axle, and specialty/multiple axle combinations
•	Satisfies any ABS requirement
Optional configuration using our patented FFABS Valve
•	Provides advantages of Full Function ABS in a high end system
Provides all wheel sensing for tandem axle trailers
•	Eliminates tire flat spotting