VB-VK Commodore Brakes
Page Created by T July 23rd 2012:
VB-VK Commodore Brakes:These Drum Brakes have no Leading Shoe as did previous Brakes. As a result both Shoes are identical. They are also Dual Servo Non-Energising.
The Term Dual Servo means that each Brake Shoe is operated by its own Hydraulic Piston. Both Pistons live in a common Housing.
Dual Servo Non-Energising:
The Drum Brakes on these Cars are Dual Servo Non-Energising. This means that the front most Brake Shoe wears more and does most of the braking when the Car is braked in the forward direction. It also means that the rear most Brake Shoe wears more and does most of the braking when the Car is braked in the reverse Direction.Non- Energising means that each Shoe has a solid Pivot that prevents the Shoe from being rotated around during activation.
Pre-Commodore Holdens:Earlier Holdens were Dual Servo Energising. These Drum Brakes wear both Brake Shoes evenly under braking. Automatic Adjusters on these Cars only worked during Braking while reversing. These Brakes were Energising meaning each Shoe has a floating Pivot that allows the Shoe to rotate around during activation increasing the effectiveness of the Brake.
Automatic Adjuster Pivots:
The Rear Drum Brakes of these Cars have Automatic Adjusters. Each Automatic Adjuster pivots on a Roll Pin that is 3/16" in diameter and 3/4" long. The Roll Pin can be replaced by tapping it out with a Hammer. A new Roll Pin can be tapped in with a Hammer.
Automatic Adjuster Arms:
RH Part number 92005246LH Part number 92005247
Activating the Automatic Adjusters:
It's as important to operate the Brakes in both the forward and reverse directions to allow the Automatic Adjusters to perform their task adequately.
Defective Brake Shoes:
Brake Shoes that have Oil soaked into them are useless and should be replaced by new ones.