VB-VK Commodore Brakes

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Page Created by T July 23rd 2012:

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Passenger's Side VB - VK Commodore Rear Brake Assembly. The Automatic Adjuster Spring is in the correct position. Photo by Thunderbolt. Click to Enlargen.
 

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.
Driver's Side VB - VK Commodore Rear Brake Assembly. The Automatic Adjuster Spring is in the correct position. Photo by Thunderbolt. Click to Enlargen.
 

Dual Servo:

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.    
VB - VK Left Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.

 
VB - VK Left Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.
 
VB - VK Right Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.
 
VB - VK Right Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.
 
VB - VK Right Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.
 
VB - VK Left Hand Automatic Adjuster Lever. Photo by T. Click to Enlargen.
 
The Roll Pin as used to retain a Distributor Plastic Drive Gear. Click to Enlargen. Photo by Jacks.

 
The Roll Pin as used to retain a Distributor Plastic Drive Gear. Click to Enlargen. Photo by Jacks.
 
The Photo shows a Roll Pin (labelled Pin) similar to that used in VB-VK Drum Brakes. Photo by Jacks. Click to Enlargen.
 
 
Passenger Side VB - VK Commodore Rear Brake Assembly. The Automatic Adjuster Spring needs to be removed and refitted with the lower connection entering from the Brake Plate Side of the Shoe. That way the Spring causes the Adjuster Lever to ratchet properly against the Adjuster Wheel. Photo by Thunderbolt. Click to Enlargen.
  
Driver Side VB - VK Commodore Rear Brake Assembly. The Automatic Adjuster Spring needs to be removed and refitted with the lower connection entering from the Brake Plate Side of the Shoe. That way the Spring causes the Adjuster Lever to ratchet properly against the Adjuster Wheel. Photo by Thunderbolt. Click to Enlargen.
   
 

Automatic Adjusters:

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.

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