AUTOMATIC SLACK ADJUSTERS
Brake Drag Issues: During prolonged braking, it is normal for the drum to increase the chamber stroke by as much as ¼" due to drum expansion caused by elevated heat. During this event, the [slacks] rate of adjustment is critical in helping reduce the risk of over-adjustment and brake drag. If the [slack] adjusts aggressively to overcome or eliminate this temporary lining to drum gap, when the brake drum cools and moves back to its normal size you will be guaranteed a bad case of brake drag.
MORE brake applications, designed to provide a MORE gradual adjustment rate significantly reduces the risk of brake drag. Example 1:
Example 2:
The chart shows the GUNITE [slack] takes 12 brake applications to Alltrux 23 brake applications to overcome the same ¼" gap.
The chart shows the BENDIX [slack] takes 35 brake applications to Alltrux 34 brake applications to overcome the same ¼" gap.
Result: The Alltrux style (slack) adjusts more gradually reducing the likelihood of brake drag.
Result: The Alltrux style (slack) adjusts virtually the same as the Bendix OE brand.
Adjustment Rate OE vs. Alltrux Brake Original Equipment Brand
Drum Expansion
# of Orig Equip Brake Apps
# of Alltrux Brake Apps
Orig Equip Lining to Drum Clearance
Alltrux Lining to Drum Clearance
Bendix_Versajust
¼"
35
34
0.014
0.013
Gunite_2000
¼”
12
23
0.014
0.012
Meritor
¼”
14
22
0.012
0.012
Haldex_S-ABA
¼”
23
23
0.009
0.012
Every Alltrux (slack) is tested in the USA to meet SAE J1462 requirements.
ALLTRUX.COM | (844) ALLTRUX
ALL MAKES. ALL PARTS. ALLTRUX