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Re: Residual pressure valve of front disk brakes.

To: spridgets@autox.team.net, ChuckP@magenic.com
Subject: Re: Residual pressure valve of front disk brakes.
Date: Wed, 2 Aug 2000 09:49:54 -0700 (PDT)
I seem to remember when I rebuilt my MC, that there is a rubber non-return 
valve 
on the brake side (dual master). Doesn't that pretty much take care of this 
issue, or at least partially address it??

 - Bryan
  
>To: "'spridgets@autox.team.net'" <spridgets@autox.team.net>
>Subject: Re: Residual pressure valve of front disk brakes.
>MIME-Version: 1.0
>
>Actually they do.  It is normal to run a 2lb rp valve for discs and 10lb for
>drums, at least in big race cars and my Willys Jeep.  Keeps the calipers
>from walking back into the bore.
>
>
>
>Chuck Pedretti MCSD, MCSE+I, MCDBA
>Senior Consultant
>Magenic Technologies
>
>http://home.off-road.com/~chuckp
>
>
>-----Original Message-----
>From: Charles Christ [mailto:cfchrist@earthlink.net]
>Sent: Tuesday, August 01, 2000 6:15 AM
>To: Andrew.Griffith@readrite.com; spridgets@autox.team.net
>Subject: Re: Residual pressure valve of front disk brakes.
>
>
>disc brakes do not use residual pressure check valves.  only drum brake set
>ups use residual pressure check valves.  and in reference to that , the
>check valve was intended to keep wheel cylinder cups spread slightly to keep
>them sealed against the cylinder walls/ bore.  if you have spreaders(a
>spring loaded disc pressing against the rear<fluid side> of the rubber cup)
>in your wheel cylinder there is no  need for a check valve there either.
>some feel the check valve will give a higher pedal, or a faster aplication
>of a brake.  this may be so!  but that was not the original design of the
>check valve.  without the check valve , brake fluid would seep past a wheel
>cylinder seal when sitting stationary for extended periods, since a wheel
>cylinder cup is not intended to be a tight interference fit.
>
>in disc brake set ups, if you use a residual pressure check valve the pads
>will not properly release all the way and you will constantly have the pads
>dragging on the rotors.  this will cause premature pad wear and rotor
>warpage.  the pads will actually be in a partially applied situation any
>time you are not on the pedal.
>
>chuck.
>
>----- Original Message -----
>From: <Andrew.Griffith@ReadRite.com>
>To: <spridgets@autox.team.net>
>Sent: Tuesday, August 01, 2000 3:32 PM
>Subject: Residual pressure valve of front disk brakes.
>
>
>> Anyone ever use a residual pressure valve on the front disk brakes? If so
>> what pressure did you go with? For those who haven't heard of one of these
>> before... They're a pressure valve that keeps a couple to a few pounds of
>> peddle or brake pressure in the line (normally the front) to maximize and
>> quicken your braking... or at least that's how I understand they work.
>> Thanks a heap,
>> -Drew in San Jose
>>


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