RE: [DML] Re: Low Drag Disc Brakes

["Tom Tait" <TTait@xxxxxxxxxx>]

I'd think it would help with occasional squealing, and perhaps in
keeping things just a bit cooler.

 

________________________________

From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf
Of Elvis
Sent: Friday, January 04, 2008 1:22 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: Low Drag Disc Brakes

 


Bob - I may be too young and also I never really worked on
american cars, but what kind of difference could there be 
between regular pistons and so called low drag pistons ?

Compared to the force that is needed to reduce the speed 
of the car, the force that a regular (not rusty) piston
needs to move a bit is like nothing.

Also there is no spring that pulls the piston back, instead 
the big O-Ring pulls the piston back for approximately 0.1-0.3mm.

The piston does not really move in the O-ring, instead it 
pushes the O-Ring a bit outside with the piston, which then
pulls the piston back when releasing the pedal.
Moving the piston in the rubber O-Ring only happens to 
compensate the wear of the brake pads.

So from the theory how it works I don't see how the drag 
could be reduced a lot - and I see even less possibilities
to gain a lot from that.

But hey - a new day, a good reason to learn something new :-)
If you have more details, I'd like to know.

Elvis & 6548

>
> 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
>

 



[Non-text portions of this message have been removed]



To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/dmcnews/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:dmcnews-digest@xxxxxxxxxxxxxxx 
    mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/