[DeTomaso] Wilwood Brakes WTF????

eb0711 at kolumbus.fi eb0711 at kolumbus.fi
Fri Apr 19 11:00:05 EDT 2013


Pulled out my old Wilwood master to feel it, and will confirm you're right.

-Janne

4/19/2013 1:49 PM, Tomas Gunnarsson kirjoitti:
> 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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