[DeTomaso] Wilwood Brakes WTF????

[Tomas Gunnarsson]

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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