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L Brake Systems] answers
On-board "intelligent" systems for trailer brake maintenance will save time and money on fault rectification, assuming you have the correct equipment to make the most of them.
you don't have to be Inspector Morse to know what's happening within the brake system on your trailer. The evidence is there if you know where to look.
Haldex provides additional and dedicated on-board diagnostic aids for interrogating braking systems and components. This equipment will provide evidence of work done, predicted service life and suggest methods for the successful analysis and location of system faults.
Modular series trailer anti-lock "This series of ABS options (Modular I Upgrade Advanced ABS 2S/1M technology with odometer function; Modular 1 Plus Additional features of reset to ride height, vehicle data system and end of line test; Modular 2 All the above features incorporated in a 25 & 4S/2M ABS) allows fleet operators not only to specify the type of ABS function required, but provides added value features including integrated odometer function, a comprehensive Vehicle Data System with reset to ride height and on-board diagnostics capability.
The Info-Centre is intended to provide dedicated on-vehicle diagnostics. It is an optional tool which provides one of the methods for system interrogation on all the Modular Series ABS, starting from Modular 1 Upgrade.
There is an odometer function within the ABS system which allows the Info-Centre to read total distance covered (in miles or Km) and is pre-programmable to calibrate for all tyre sizes.
Other features include a trip distance counter and an advanced service warning, determined on a work-done basis (pre-programmed distance covered).
The Info-Centre screen can be used with vehicle power on or off. With the power on a more comprehensive interro gation can be performed, providing access to current faults, last stored faults, sensor/cabling checks, service intervals settings or distance-to-next-service reconfiguration and test modes.
In "power off" mode, the status of the complete system, current faults, if any, together with configuration data can be interrogated. There is a special ADR version available.
Brake Lining Wear
Sometimes the simplest things are best and their value is often overlooked. The pointer Haldex devised in the early 1970s, called the Visual Lining Wear Indicator (VLWI), continues to be installed on all new UK trailer build on cam shafts using circlip retention. Although simple, the ingenious profile of the splinelocation device allows setting without deforming the indicator.
It is worth noting that the VLWI should be set vertically, irrespective of the shape or angle of the adjuster arm when the linings are new. Then as the automatic adjuster compensates for slack and the camshaft rotates, the VLWI provides an obvious indication of lining condition, greatly speeding the inspection process.
Electronic Lining Wear Sensor (EL'WS)
With the advancement of EBS, Haldex now provides an optional ELWS, which installs externally on the camshaft and interfaces with the Automatic Brake Adjuster (ABA).
Providing an analogue or digital signal, it can be used simply to give a warning signal or be integrated within the EBS system to produce data for further processing and diagnostic requirements.
This provide the potential to indicate individual wheel station lining condition, evidence of brake function and ABA performance.
Automatic brake adjuster
Preventative maintenance is essential when dealing with foundation brakes and braking systems. The Haldex clearance sensing ABA is the only automatic brake adjuster, installed by S-cam brake manufacturers, which measures and pre-determines its "best use by date", effectively preventing function failure.
An annual check on the de-adjustment torque required to turn the worm screw hex (backing off the linings), will determine whether the adjuster is fit for the next 12 months or 150,000km. The critical limit is 18Nm (131b/ft). Any reading above this represents a pass, while readings less indicate that the adjuster should be replaced immediately (See fig 1).
Disc Brakes
The modular design concept of the Haldex disc brake incorporates a cassette mechanism comprising actuation, automatic slack adjuster and tappet synchronisation—all in a single unit.
There is no requirement for specialist skills when maintaining this unit and its design, together with the four-pin slider arrangement, provides the lightest disc brake in its class.
Air Treatment
The most common reason for air brake component failure is contamination of the compressed air, due to water and dirt ingress. But the common practice of regular air tank draining, though essential, is not enough to prevent all problems.
Evidence of water in the air reservoirs can indicate deterioration of the drier cartridge on the tractive unit. While early replacement will give at least some protection to tractor brake compo nents, the best solution for protecting the trailer is to consider the capacity of the tractor's air drier.
If it is not a Haldex drier then size could be a problem. Also, fitting the flaklex heated auto drain valve to the lead tank on the trailer will at least ensure continued removal of condensate.
Haldex is committed to developing technically advanced products which are significant to commercial vehicle performance and safety. The inclusion of real added value features gives a better return on investment for customers, while high product quality adds to the overall aspect of safety.