[DeTomaso] Brake question

[Julian Kift]

Brakes will do weird things under stress conditions, most certainly you have boiled the fluid in the caliper. The shuttle valve may not actuate in this circumstance as micro gas bubbles are instantaneously generated at the caliper or more commonly the valve can become varnished over time. Ideally when you encounter this you want to keep rotating the wheels until the disc cools to prevent disc warping. Take this as an opportunity to go through your braking system.

Brake fluid is hygroscopic and absorbs water, which significantly reduces it's boiling point, hence the term 'dry' and 'wet' boiling points quoted by fluid manufacturers. Your fluid should be changed (full flush) at a minimum every 2 years for this reason. Brake fluid is said to be generally the most neglected part of a car, yet one of the most important.

Julian

> Date: Sat, 12 May 2012 09:48:26 -0400
> From: rob at dumoulins.net
> To: bd8134 at gmail.com
> CC: michael at michaelshortt.com; detomaso at realbig.com
> Subject: Re: [DeTomaso] Brake question
> 
> My brakes never would lock up. I'm wondering now if my fronts work much at
> all. The nose never dips down. Im still disturbed that the pedal went ti
> the floor.
> On May 12, 2012 9:38 AM, "Brian Dudley" <bd8134 at gmail.com> wrote:
> 
> > You should check how your brakes are plumbed.
> > With a stock master cylinder setup you have a dual or split brake system.
> > It is designed to prevent what happened to you, loss of brake fluid or no
> > brakes on one of the brake circuits.
> > The shuttle valve monitors this difference in brake pressure and brings up
> > the dash light.
> > With a loss of pressure in one circuit you should get some loss of brake
> > effect and greater travel but not pedal to the floor.
> > If your car is plumbed correctly then maybe the master cylinder is faulty.
> > Here is a link with better explanations..
> > http://www.winbrake.com/trainingmaterials/AutoFundamentalsBrakes.html
> > Be safe out there.
> > Brian
> >
> >
> > On Sat, May 12, 2012 at 9:17 AM, michael at michaelshortt.com <
> > michaelsavga at gmail.com> wrote:
> >
> > > Happened to me on the Tail of the Dragon on my motorcycle, i used the
> > rears
> > > brakes waaay too much until my brother straightened me out on front
> > braking
> > > only in that application.  Had to drain it all out and use all new brake
> > > fluid.
> > >
> > > Michael
> > >  On May 12, 2012 9:09 AM, "Larry - Ohio Time Corp" <
> > larry at ohiotimecorp.com
> > > >
> > > wrote:
> > >
> > > > Hi Rob,
> > > >
> > > > Yes most certainly the parking brakes locked up and over heated
> > > everything.
> > > >
> > > > It is a good time to remove the wheels, make sure the brakes are not
> > > > dragging and bleed the brakes. I am not sure if the fluid changes in
> > any
> > > > way
> > > > after over heating, so I have always changed it.
> > > >
> > > > I would also check the pads for glazing and sand them if needed.
> > > >
> > > > Larry (heading out to the shop now) - Cleveland
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: detomaso-bounces at realbig.com [mailto:
> > detomaso-bounces at realbig.com]
> > > > On
> > > > Behalf Of Rob Dumoulin
> > > > Sent: Saturday, May 12, 2012 6:18 AM
> > > > To: pantera list
> > > > Subject: [DeTomaso] Brake question
> > > >
> > > > In Florida I rarely use my parking brake but it is functional. While
> > > > getting my AC serviced, the shop had it pulled tight when I picked up
> > the
> > > > car. I immediately noticed the brakes were still dragging with the
> > > parking
> > > > brake released and drove slowly until they seemed to unstick. Within
> > one
> > > > mile I had zero brakes. Pedal went to floor and would barely stop the
> > > > Pantera with three pumps. Close call. I figured I lost fluid but it was
> > > > still full. My drivers rear rim was too hot to touch, so good
> > indication
> > > I
> > > > found the stuck one. After a few hours I got back in and brakes were
> > > > normal.
> > > >
> > > > Would boiled fluid in one rear caliper cause all brakes to fail? I no
> > > > longer have the shuttle valve installed, it that matters.
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