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Automatic Slack Adjuster


Method whereby the Automatic Slack Adjuster maintains the correct Pre-Set Clearance

Alpha Angle

The installation angle of the Control Arm on the Slack Adjuster

Anchor Bracket

Used with Quick-Fit Control Arms

Anchor Pin

Used with Control Arms which bolt to the Anchor Point

Anchor Point

The bracket which connects the Control Arm of the Slack Adjuster to the vehicle


Connects the Slack Adjuster worm wheel to the brake shoes

Clevis Bush

The bush in the Housing where the actuator mates with the Slack Adjuster

Control Arm

The rotating arm connecting the Cover Plate to the Anchor Point

Control Unit

Combination of Cover Plate, Control Arm, Alpha Angle (ASA only) and Pre-Set Clearance

Cover Plate

Metal pressing which is screwed on the Housing to protect the Mechanism

Fitting Kit

Loose parts supplied with the Slack Adjuster

Grease Nipple

All Webb Slack Adjusters are fitted with Grease Nipple to lubricate the Mechanism


Plastic insert housed in Peg Bolt type Control Arms

Hex Nut

The 12mm nut which rotates as the Mechanism adjusts, being part of the Worm Shaft


Cast section which contains the Mechanism and extends to hold the Clevis Bush


With Cover Plate facing the Hex Nut on your left, this is the angle of the Housing, taken from the vertical


Manual Slack Adjuster


The internal components of the Slack Adjuster which maintain the Pre-Set Clearance of the brake system


Original Equipment Manufacturer


With Hex Nut facing, this is the distance from center of the Hex Nut to center of the Housing where the Clevis Bush sits, taken from the vertical

Peg Bolt

Used with Control Arms incorporating a Grommet in the Anchor Point

Pre-Set Clearance

The distance between brake lining and brake drum specified by the vehicle manufacturer


Common Anchor Point type on trailers where the Control Arm sits in the slot of the Anchor Bracket


Self-setting Automatic Slack Adjuster


The mating teeth of the Camshaft and Slack Adjuster

Wear Indicator

Pointer which is fixed to and rotates with the Camshaft, showing brake lining wear

Worm Shaft

Part of the Mechanism which mates with the Worm Wheel and includes the Hex Nut

Worm Wheel

Part of the Mechanism which mates with the Worm Shaft and Camshaft