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Porsche 914 Technical Information
Brake System Data

Description Sizes and Settings Wear Limits
Tandem Brake Master Cylinder
Bore 17.46 mm dia.  
Stroke 18/13 mm  
Ratio at foot pedal 5.4:1  
Play: operating rod/piston 1 mm  
Front Wheel Brakes
Brake disc diameter 281 mm  
Thickness, new 11+0.05 mm, -0.15mm  
Min. thickness after machining* 10.0mm 9.5 mm
Thickness tolerance Max. 0.02 mm  
Lateral run-out, installed 0.2 mm  
Caliper piston dia. 42 mm  
Pad thickness 10 mm (14 mm from 1973 models) 2.0 mm
Clearance 0.05-0.2 mm  
Surface of four pads 100 cm2  
Rear Wheel Brakes
Brake disc diameter 282 mm  
Thickness, new 9.5-0.2 mm 8.5 mm
Min. thickness after machining* 8.9 mm  
Thickness tolerance Max 0.02 mm  
Lateral run-out, installed 0.2 mm  
Caliper piston dia. 33 mm 2 mm
Pad thickness 10mm  
Clearance 0.2 mm  
Surface of four pads 80 cm2  

*Machine brake discs uniformly on both sides.


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