Function
The Haldex ModulT Air Disc Brake come both left and right handed, it is important the correct hand is fitted in relation to the normal wheel/disc rotation.
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)
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.
Following video describe step by step the mechanism function.
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 |
|---|---|---|
| 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 |
| Disc | ||
| External diameter of brake disc | 377 mm | 430 mm |
| Total thickness - new | 45 mm | |
| Residual thickness - worn out | 37 mm | |
| Pad | ||
| 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
Options
- Pad wear indicator
- Pad wear indicator sensor
- Pad wear sensor
- Carrier hole pattern
