[DeTomaso] Wilwood Brakes WTF????

[eb0711 at kolumbus.fi]

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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