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Meritor Automatic Brake Slack Adjuster Position (BSAP)

Details

 

There are four (6) different Meritor ASA templates available and they are not interchangeable. 

Template Color

Part Number

Use

Green

TP-4788

Air Disc Brake with offset clevis

Yellow

TP-4789

Air Disc Brake with straight clevis

Dark Brown

TP-4786

Truck or tractor drum brake with 1.38 clevis

Tan

TP-4787

Trailer drum brake

White

TP-4781

Coach drum brake with 7-inch or bolt-on slack adjuster

Grey

TP-10130

Truck or tractor drum brake with 1.30 clevis

 

When adjusting a Meritor ASA you must use the template that correctly matches the clevis.  If the template and clevis are not matched, the slack adjuster will not adjust the brake properly. 

NOTE:  Meritor “Stroke Sensing” ASA’s must be set at a 101 degree angle on trucks and tractors, regardless of the “pin-to-pin” dimension.

Proper ASA set-up will allow a clearance of .030 between the lining and the brake drum.  Mismatching of the template with the clevis may result in a slack adjuster that “under-adjusts” (110°, 115°, etc.) causing stopping distances to increase, or, if the slack adjuster “over-adjusts” (95°, 90° etc.), the clearance may tighten causing the linings to “drag” and damage the brake.

For more information regarding this matter, please refer to Meritor Maintenance Manual 4, Section 5, pages 31 thru 34, or contact  your local Meritor Service Representative.

Submitted by:

Wayne Seaman, TruckSavvy.com and Meritor