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C1 Parking Brake

Larry Pearson, #5C

Larry’s topic is intended to talk on the C1 Parking Brake, the operation and adjustment. Additional Tech Sessions will cover other aspects of the C1 braking system and overhaul. Again, this discussion is somewhat brief and is more fully presented on the Chapter Web Site.
The C1 brake system:

1.4-wheel Brake System1. Each wheel contains 2 brake bands/shoes which move outward when the brake pedal is pressed.  The brake band movement presses against an outer brake drum and the resulting friction stops the drum and wheel from rotating.

2.2. A Single Wheel Cylinder in each wheel forces the two Brake Bands against the inside of the wheel drum.

3.A Single Master Cylinder Reservoir contains the hydraulic brake fluid which is forced (using the brake pedal) through the brake lines to expand the wheel cylinders.

4.Brake band adjustment is not automatic on C1’s.  Clearance between brake bands and the Brake Drum must be manually adjusted. 

5.Brake band adjustment is accomplished by turning (with a proper tool) through the slot in the lower rear face of the brake backing plate.  While spinning the wheel adjust the screw mechanism to expand the bands.  Once the bands begin “dragging” back off 12 notches (1 complete turn) on the adjustment for metallic/organic brake material.


Brake Lubrication

Be careful of lubricating surfaces in the brake assembly as any lubricant on the band/shoe material will affect the braking action.  Similarly, brake fluid on the shoes require brake shoe replacement because brake shoes cannot be cleaned, once contaminated.  The primary lubrication points are the raised pad surfaces behind each brake shoe.  These surfaces are raised areas located on the backing plates designed to keep the brake shoes from laying against the backing plate surface.  A “small” amount of high temperature grease can be applied between the shoe and raised surface.

Parking Brake

1. The Parking Brake only operates on the rear wheels. 

2. The Parking Brake is a mechanical system separate from the main hydraulic brakes. Pulling the hand brake mechanically spreads rear bands.

3. Parking Brake handle is a mechanical control cable connected to a mechanical lever mechanism underneath car.  This lever then pulls cables extending to each rear wheel to expand brake shoes.

 4. A lever action within each rear brake assembly will expand the lining against the brake drum surface.  Proper adjustment of the brake bands will control the distance pulled required to set

5.   In an emergency the parking brake can be used to stop a car if the primary braking system experiences a failure.

Parking Brake 1 Parking Brake

Southern California Solid Axle Corvette Club

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