[DeTomaso] second update on clutch slave not compressing fully

[Asa Jay Laughton]

Jim,

Bear with it, there is something to be learned here.

When I first got my Pantera, it had a slight pull to the left.  It 
usually got worse the longer I drove.  One day, it nearly locked up the 
left front.  The wheel was so hot I couldn't touch it.

I decided to do a brake job.  I sourced another set of calipers from 
someone on this list.  I got the closest brake pads I could find at Napa 
and carved them to fit.  But  here is the important part.

The -reason- the brakes were riding on the right front is because what 
was in the brake lines was no longer FLUID, it was a mass of globulous 
black goo.  It was old enough and contaminated enough that it would not 
release the piston in the caliper.  Oh sure, it would apply the brakes 
when I pressed the pedal, but it wouldn't release back to its resting 
position once I was off.

Your clutch situation sounds just like my old left front caliper.  I 
think it's time you took the slave apart, blew out the lines between the 
master and slave and started over.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired
&  Shelley Marie
Spokane, WA
******************************
http://www.racingagainstautism.com
http://www.teampanteraracing.com
http://facebook.com/racingagainstautism


On 5/12/2012 5:10 PM, Pantdino wrote:
>
>
>
>
>
> Yes, the part of the slave rod covered by the boot rotates, so I shortened the rod enough to get the appropriate play. Clutch arm now moves easily-- not binding or stiff.  But actuating the clutch again produces the same situation--  play gone, clutch arm being held rearward by slave rod.  Tapping clutch arm forward w mallet moves it to recreate play, but it disappears again at the next clutch actuation.
>
> So it is definitely the clutch hydraulic system that is not returning to rest position.
>
> I have never heard of a clutch master failing in such a way that the piston fails to return to rest position and instead keeps pressure in the system. Has anyone else?
>
> A clutch slave is just a simple piston in a bore with one fluid connection, and I don't see how it could fail in this way.  Also, the fact that the situation occurs with the rod shortened means the slave piston is now in a different spot and is still not moving, so unlikely to be a binding piston.
>
> Jim
>
> -----Original Message-----
> From: Pantdino<pantdino at aol.com>
> To: detomaso<detomaso at realbig.com>
> Sent: Sat, May 12, 2012 2:14 pm
> Subject: [DeTomaso] update on clutch slave not compressing fully
>
>
>
>   drove the car from my other garage to home. The car had been sitting for a
> onth there, and the stop bolt WAS touching the bracket. But upon pressing the
> lutch there was no free play.
>
> fter the short drive home the car sat for an hour or so and I noted the bolt
> as no longer touching the bracket. I used a piece of rope to remove the spring
> stiff spring which takes 2 hands for me) and now even though the bolt was not
> ouching the bracket there was free play-- I could easily move the clutch lever
> bout 2-3 mm with my hand, as it was when I adjusted it before.
>
> ut after actuating the clutch a few times the bolt is further from the bracket
> han it was before the drive home and the clutch arm is like rock-- absolutely
> tiff, can't move it with my hands at all.
>
> y life is complicated by the fact that the clevis pin has been seized in the
> ores of the clutch arm since I got the car in 1989. So I can't remove it to see
> ow the pin aligns with the bores. But right now the clutch arm is still under
> ension from the hydraulics, so it would obviously not line up.
> I
>   has been too long now since I installed the new clutch slave, so I can't
> emember what the actuating rod looks like under the rubber boot and I can't
> ompress my boot far enough to see. I'm thinking the rod has a female thread,
> nto which the end with the hole screws. I that correct? So I need to rotate the
> ortion of the rod hidden by the boot to decrease its length, correct?  Can I
> ush the boot off the far end and turn the exposed metal with vise grips to do
> his?
>
> hanks,
> Jim
>
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