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Function - Inspection - Wear limits - Technical data


The Haldex ModulT Air Disc Brake comes both left and right handed, it is important the correct hand is fitted in relation to the normal wheel/disc rotation.

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The ModulT enhances a floating monobloc calliper C and an integrated adjustment unit which compensates for brake pad wear. The unit, which is actuated by the mechanism lever A, presses the inner brake pad B against the disc, which then causes the calliper C to slide laterally, so that the outer brake pad D also comes in contact with the disc. The calliper moves on two stainless, lubrication free, slide pins E

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The large diameter single piston mechanism ensures even force distribution and support to the brake pad back plate. In addition, high efficiency and low hysteresis is achieved by the double roller bearings surrounding the lever.

Single piston mechanism has a similar force distribution as previous generation twin piston mechanism, making it also suitable for tougher applications.

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The Haldex ModulT Service Manual states the importance of regular ADB function checks to ensure continued correct braking function in operation. Service Bulletin (SB DB 010L) has been published to highlight the importance of this specific service check and if not already performed, it is recommended this check is carried out at the next available planned vehicle workshop visit. Failure to do so could compromise the continued correct ADB braking function in operation. 

Regular inspection:

  • Check that the brakes function properly before driving and that they work effectively and smoothly.
  • Check that the service and parking brake function is effective by trying to drive the vehicle with the service and parking brake applied.
  • Make sure you have good lighting conditions.
  • Inspect visible parts of the brake and its components and look for:
    • Damage
    • Collection of debris
    • Corrosion
    • Overheating signs
    • Cracks in brake discs
    • Unusual wear
    • etc

Wear limits

  • Brake pads, min. lining thickness: 2 mm
  • Brake pad, max. uneven wear: ±1.5 mm
  • Brake disc, min. thickness: 37 mm*

* Note. always refere to vehicle/axle manufacturers recommendations.

Technical data

Disc brake unit DBT19LT DBT22LT
Design rated max brake torque
18 kNm 20 kNm
Max axle load 9000kg*
For wheel size 19.5" 22.5"
Max. operation force 11 kN
Friction radius 149 mm 173 mm
Max. brake cylinder stroke 62 mm 65 mm
Nominal brake ratio 15.4 : 1
Mechanical efficiency > 93 %
Running clearance (min-max) 0.7 - 1.1
Weight of complete disc brake unit, including pads 29 kg 32 kg
External diameter of brake disc 377 mm 430 mm
Total thickness - new 45 mm
Residual thickness - worn out 37 mm
Total thickness 30 mm
Backplate thickness 8 mm
Pad surface area (both pads) 294 cm² 318 cm²
Pad wear volume (both pads) 603 cm³ 636 cm³

* Can also be used with 10 tonne axle loads dependant on application