1968 AMA Specifications – Brakes
AMA Specifications-Passenger Car
— Brakes —
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MODEL |
Firebird |
Firebird Sprint |
Firebird 350 |
Firebird H.O. |
Firebird 400 |
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Brakes – Parking |
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Type of control |
Foot Lever Application – Hand Pull Release |
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Location of control |
Below Instrument Panel at Left |
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Operates on |
Rear Service Brakes |
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If sepa-rate fromservicebrakes |
Type (internal or external) |
Not Separate |
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Drum diameter |
Not Separate |
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Lining size (length xwidth x thickness) |
Not Separate |
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NOTES |
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MODEL |
Firebird |
Firebird Sprint |
Firebird 350 |
Firebird 350 |
Firebird H.O. |
Firebird 400 |
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Brakes – Service |
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Type (drum or disc) |
Drum – Std. |
Front Disc. – Opt. |
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Self adjusting (std., opt., N.A.) |
Standard |
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Power brake make &type (remote, int., etc.) |
Std. |
— |
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Opt. |
Delco-Moraine, Integral Type, Vacuum Suspended |
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Effective area (sq. in.)* |
149.4 |
101.9 |
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Gross lining area (sq. in.)** |
155.5 |
109.1 |
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Swept area (sq. in.)*** |
269.2 |
323.6 |
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Percent brake effectiveness – front |
62.6 |
62.6 |
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Drum or Disc |
Diameter (nominal) |
Front |
9.5 |
11.0 |
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Rear |
9.5 |
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Type and material |
Cast Alloy Iron |
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Disc (vented or solid) |
— |
Vented |
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No. pistons per caliper |
— |
4 |
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Wheel cylinder bore |
Front |
1.125 |
2.062 |
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Rear |
0.875 |
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Master Cylinder |
Bore |
1.00 |
1.125 |
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Displacement distribution |
Front % |
59 |
69 |
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Rear % |
41 |
31 |
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Disc Brk. Valve |
Type (proportion, delay, metering, other) |
— |
Metering-Type Delay |
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Pedal arc ratio |
6.3:1 (Manual) – 3.4:1 (Power) |
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Line pressure at 100 lb pedal load |
700 Manual, 900 Power Opt. |
575 Manual, 800 Power Opt. |
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Shoe clearance adjustment |
(a) |
Spring Loaded |
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Brake lining |
Drum or Disc |
Drum |
Disc Front – Drum Rear |
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Bonded or riveted |
Riveted |
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Front Wheel |
Material |
Molded Asbestos |
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Size (length x width x thickness) |
Prim. or out-board |
7.6 x 2.5 x 0.196 |
5.95 x 1.75 x 0.40 |
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Second. or in-board |
9.85 x 2.5 x 0.265 |
5.95 x 1.75 x 0.40 |
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Segments per show |
One |
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Rear Wheel |
Material |
Molded Asbestos |
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Size (length x width x thickness) |
Prim. or out-board |
7.6 x 2.0 x 0.196 |
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Second. or in-board |
9.85 x 2.0 x 0.265 |
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Segments per show |
One |
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NOTES |
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* Excludes rivet holes, grooves, chamfers, etc. ** Includes rivet holes, grooves, chamfers, etc. *** Total swept area for four brakes. (Widest lining contact width for each brake x its contact circumference.) (a) Tighten drum brakes to heavy drag then back off 26 notches. |
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