[DML] Re: Low Drag Disc Brakes

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

It is actually the piston seal that "retracts" the piston very
slightly. A pretty standard feature of disc brakes for a long time.
You can see it in action for yourself. Raise a wheel off the ground.
Rotate it. It should rotate easily. Now have someone step on the brake
pedal. It should be very hard (if not impossible) to turn the wheel.
Now have your assistant release the pedal. It should be easy again to
turn the wheel and the brakes should not rub.
David Teitelbaum
vin 10757


> In the early 80s, cars shifted to low drag disc brakes.
> 
> For example, the 82-83 AMC Spirit disc brakes were low friction 
> compared to the 78-79 Pacer disc brake pistons. The parts are 
> interchangable so you can upgrade a Pacer to the low friction pistons.
> 
> What about the D?  Are these low friction disc brakes?
> 
> Are there later model calipers that are low friction.
> 
> Typically, the low friction pistons slightly retract after application. 
>   This could be a spring in the main piston that creates a  little 
> negative hydraulic pressure to retract the pistons.
> 
> Drum brakes used to do this with springs.
> 
> Bob
>




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