[Diy_efi] (off topic) Disk pad wear reduction with

[Mike]

mmm, I'm not wanting a 'huge' pedal travel and not sure why you
automatically think thats what I want...

I'm wondering if there is some valve arangement that would only
draw back enough to give say 0.5mm pad-disc clearance - obviously
dont want it to go any further for time/safety reasons etc

Some time next year (winter in Aust) I want to drive across nullabor
(about 3000 km) after some major engine mods for an economy run/test
and in preparation wondering if its feasible to add something to
*ensure* disc-pad drag is at a minimum during that long trip,

I suppose I could do it electronically with a vacumm surge tank,
solenoid interlock etc
ie Off a pedal at top switch etc. But I'm wondering if there is
a more elegant solution ?

Rgds

mike



At 08:40 PM 5/12/2002 +0100, you wrote:
>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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