[Diy_efi] (off topic) Disk pad wear reduction with hydraulic reverse valve ?

[Axel Rietschin]

The pads always retract a bit because the disk is never 100% flat and also
because of the play in the wheel bearing (not sure of the English name for
those). On racing caliper we use springs behind the pistons to make sure the
pads always stay in contact with the disk, this gives a consistent pedal
feeling. With your approach the pedal travel would be huge and inconsistent.

-Axel

----- Original Message -----
From: "Mike" <erazmus at iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Thursday, December 05, 2002 2:12 PM
Subject: [Diy_efi] (off topic) Disk pad wear reduction with hydraulic
reverse valve ?


>
> As we were on the topic of ABS and braking systems etc
>
> I wonder if there are any systems that employ some sort of hydraulic
> short/small "reverse valving" (or some such), to do this:-
>
> a. Allow normal brake pressure to apply brakes
> b. When pedal released, valve pulls/sucks back a small
> amount of fluid from the calipers to provide more
> clearance between pads and disk
> Clearly this would mean the disc pad and caliper piston are
> connected by more than friction. ie. Many pad brake installers
> use a little high temperature neutral cure silicone to help
> reduce brake squeal.
>
> Such an approach would hopefully reduce disc and pad wear by forcing
> the pads to retract (a small amount) from the discs, rather then
> leaving it to disc perturbation in the absence of hydraulic brake
> pressure. I've seen on many cars that a pedal release still drags
> the pads a little...
>
> Anyone know of any type of inline valve arrangement which might be
> suitable, manufacturable, adaptable, usable, tryable ?
>
> Rgds
>
> Mike
> Perth, Western Australia
> Some power/auto stuff here:-  http://www.iinet.net.au/~erazmus
>
>
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