[Saloon-lovers] Hello Again and A Rear Brake Piston Question

I’ve been busy with other projects for the past two years and thus have been
off the list for some time. Of course the way these things turn over,
probably no one here was here when I used to be …

Anyway, my current workshop project is the complete rebuild of the rear end
prior to being able to use the car any time we like.

The brake calipers were frozen up badly. After much effort I managed to
get the old pistons out using a combination of air pressure, long soaks in
WD-40 and a bit of heat. I purchased replacement pistons from XKs
Unlimited. The replacement pistons do not have the little circular spring
arrangement in the center of the piston. They do have a recess machined for
this feature, but the mechanism itself is not there.

My Jaguar shop manual says these pistons are non-serviceable, and the little
spring mechanism in the old pistons is staked in by dimples in the piston
metal.

As far as I can figure, these contraption is a sort of self-adjuster which
serves to keep the brake pad always in contact with the disc. I’ve never
seen this on any other disc brake system, and perhaps it is something which
was later deemed unnecessary.

Did CSK’s ship me bad/incomplete parts? Is standard practice now to do
without the self-adjust feature? If so, should I remove the pin from inside
the cylinder bores?

TIA for any advice!

John Horner

[Commercial use of subscribers e-mail addresses prohibited.]from my '67 420G. Hopefully this is the last major system needing attention

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At 10:58 PM 8/25/00, John T. Horner wrote:

I’ve been busy with other projects for the past two years and thus have been
off the list for some time. Of course the way these things turn over,
probably no one here was here when I used to be …

Welcome back, John - great to see you again!

Gene
'69 420G rhd m/wod

[Commercial use of subscribers e-mail addresses prohibited.]==============================
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John T. Horner…how could we forget a cool name like that? As I recall,
you always had good insights to offer. Welcome back!

I was a newby to the list about the time you signed off!

Tom Carson
1962 Mark 2, 3.8 MOD
Juneau, Alaska

From: Gene Halaburt heugene8587@uswest.net
Reply-To: saloons@jag-lovers.org
Date: Fri, 25 Aug 2000 23:54:08 -0600
To: saloons@jag-lovers.org
Cc: jthorner@garlic.com
Subject: Re: [Saloon-lovers] Hello Again

At 10:58 PM 8/25/00, John T. Horner wrote:

I’ve been busy with other projects for the past two years and thus have been
off the list for some time. Of course the way these things turn over,
probably no one here was here when I used to be …

Welcome back, John - great to see you again!

Gene
'69 420G rhd m/wod

[Commercial use of subscribers e-mail addresses prohibited.]

To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo

[Commercial use of subscribers e-mail addresses prohibited.]==============================
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Thanks Tom. I never thought my name was especially memorable :).

John----- Original Message -----
From: “Carson” carson@alaska.net
To: saloons@jag-lovers.org
Sent: August 26, 2000 5:57 AM
Subject: Re: [Saloon-lovers] Hello Again

John T. Horner…how could we forget a cool name like that? As I recall,
you always had good insights to offer. Welcome back!

I was a newby to the list about the time you signed off!

Tom Carson
1962 Mark 2, 3.8 MOD
Juneau, Alaska

From: Gene Halaburt heugene8587@uswest.net
Reply-To: saloons@jag-lovers.org
Date: Fri, 25 Aug 2000 23:54:08 -0600
To: saloons@jag-lovers.org
Cc: <@John_T_Horner>
Subject: Re: [Saloon-lovers] Hello Again

At 10:58 PM 8/25/00, John T. Horner wrote:

I’ve been busy with other projects for the past two years and thus have
been

off the list for some time. Of course the way these things turn over,
probably no one here was here when I used to be …

Welcome back, John - great to see you again!

Gene
'69 420G rhd m/wod

[Commercial use of subscribers e-mail addresses prohibited.]

To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo

[Commercial use of subscribers e-mail addresses prohibited.]

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http://www.jag-lovers.org/cgi-bin/majordomo

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John,
Did you ever figure out what to do about the spring retainer mechanism in the pistons? I just purchased new pistons from XK’s Unlimited and have been unable to remove the spring mechanism from the old pistons to transfer to the new. Can they be used without the springs?

Paul Ridley

The mechanism isn’t nedded:the piston will come back enough by the rubber and the slight pushback of the disc.I usually cut the pin off.
Dirk

Great, thanks Dirk!

Paul