[DeTomaso] Wilwood Brakes WTF????
Tomas Gunnarsson
guson at home.se
Thu Apr 18 02:49:11 EDT 2013
Nothing. There's no mechanism actively retracting the pistons and that's
why the valves are not needed. The only retraction you should see is
rotor kickback and the flex of the piston seals. If you have excess
kickback that's a problem in itself, nothing you "fix" by adding pad
preload with valves.
Tomas
<-----Ursprungligt Meddelande----->
From: richard bosch [theemonkey at yahoo.com]
Sent: 18/4/2013 2:52:25 AM
To: Tomas Gunnarsson
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Wilwood Brakes WTF????
So what keeps the pistons from retracting too far?
Just curious how it is designed without the valves.
--- On Wed, 4/17/13, Tomas Gunnarsson <guson at home.se> wrote:
From: Tomas Gunnarsson <guson at home.se>
Subject: Re: [DeTomaso] Wilwood Brakes WTF????
To: theemonkey at yahoo.com
Cc: detomaso at poca.com
Date: Wednesday, April 17, 2013, 2:08 PM
No, I have disassembled both master cylinders and calipers down to bare
castings and there are no valves.
Tomas
<-----Ursprungligt Meddelande----->
From: richard bosch [theemonkey at yahoo.com]
Sent: 16/4/2013 10:52:14 PM
To: Tomas Gunnarsson
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Wilwood Brakes WTF????
It could be that only the American cars have the valves in the master
cylinders.
Maybe Europeans have them in the calipers or distribution block?
They have to be somewhere in the brake system or else you have a delay
in the brakes being applied as the pistons would have a much longer area
to traverse before they contact the rotor.
--- On Tue, 4/16/13, Tomas Gunnarsson <guson at home.se> wrote:
From: Tomas Gunnarsson <guson at home.se>
Subject: Re: [DeTomaso] Wilwood Brakes WTF????
To: theemonkey at yahoo.com
Cc: detomaso at poca.com
Date: Tuesday, April 16, 2013, 6:06 AM
Must be an American thing. Euro master cylinders I've come across have
no valves built into them.
Tomas
<-----Ursprungligt Meddelande----->
From: richard bosch [theemonkey at yahoo.com]
Sent: 16/4/2013 1:10:46 AM
To: detomaso at poca.com
Subject: Re: [DeTomaso] Wilwood Brakes WTF????
Disc brakes require 2 psi residual pressure valves.Drum brakes have 10
psi. valves.
Most master cylinders have them under the flare seat where the brake
lines are screwed in thats why you do not normally see them or think
about them.
Without the residual pressure the pistons retract much further in the
caliper and there is a delay while the piston has to travel further
before it contacts the rotor.Not good as seconds count in braking
distance!
Mike's valves are "add ons" because his master cylinder does not have
any valves built in.His valve pressure is correct as the pads did not
drag on the rotors before the pad wear/cocked pad happened.
Just what i have learned from playing with lots of cars : )
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