[DeTomaso] Wilwood Brakes WTF????

[Tomas Gunnarsson]

I would say that it flows free enough in the reverse direction to allow
the caliper pistons to stay in their seals without moving.
 
Tomas

<-----Ursprungligt Meddelande----->
From: eb0711 at kolumbus.fi [eb0711 at kolumbus.fi]
Sent: 19/4/2013 11:15:06 AM
To: detomaso at poca.com
Subject: Re: [DeTomaso] Wilwood Brakes WTF????

So, it comes to the question how ideally does the one way lip seal 
work? If it's slightly tight in the bore, the return spring may indeed 
pull on the pads some?

-Janne

4/19/2013 11:46 AM, Tomas Gunnarsson kirjoitti:
> Not in the cylinders I've seen. Take the following scenario: You're
> bleeding the brakes two-person-style. Towards the end you have a
> basically air free system. Open bleeder on caliper -> push pedal ->
> pedal goes "low" as fluid leaves caliper bleeder -> close bleeder ->
> release pedal. The system is now free from pressure and the mc is
close
> to the bottom of the bore. The mc piston returns from internal spring
> pressure but it does not retract the caliper pistons. The mc seals are
> often of the lip type, this type of seal is in practice one-way as the
> lip un-seals when subject to reverse pressure.
> 
> Tomas
>
> <-----Ursprungligt Meddelande----->
> From: Pantdino [pantdino at aol.com]
> Sent: 19/4/2013 6:48:28 AM
> To: theemonkey at yahoo.com; detomaso at poca.com
> Subject: Re: [DeTomaso] Wilwood Brakes WTF????
>
> But the sealing function is lost only when the pedal is at the full up
> position. At that point the fluid in the master cylinder reservoir is
in
> continuity with the fluid in the master cylinder., but as soon as you
> step on the pedal at all the master piston moves past that little hole
> and the bore is a closed space which decreases in size as the pedal is
> depressed. As the master cylinder piston retracts from "on hard" to
> "lightly on" positions, a slight "suction" will be produced which will
> tend to pull the caliper piston back a bit.
>
> But what I was told is that it is the deformation of the seals that
does
> most of the caliper piston retracting.
>
> -----Original Message-----
> From: richard bosch <theemonkey at yahoo.com>
> To: detomaso <detomaso at poca.com>
> Sent: Thu, Apr 18, 2013 7:17 pm
> Subject: Re: [DeTomaso] Wilwood Brakes WTF????
>
>
> The master cylinder piston and seals are designed so that the sealing
> function is lost when the piston travels back from the "brakes on"
> position. Also, the seals allow fluid to run past them as long as the
> brakes are not applied.
>
> Tomas
>
> Maybe that is the difference.Maybe the "race" brakes and some American
> designs
> do not have the "one way" seals and that is why they require the
> residual
> pressure valves.
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