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Re: [Healeys] Brake calliper seals

To: <simon.lachlan@homecall.co.uk>, <healeys@autox.team.net>
Subject: Re: [Healeys] Brake calliper seals
From: WILLIAM B LAWRENCE <ynotink@msn.com>
Date: Sat, 28 Apr 2012 01:28:21 +0000
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Simon,

Please define "LM grease". If it is not the rubber grease as is sometimes
supplied in hydraulic rebuild kits then I would advise against using it. No
petroleum product should ever be used on the fluid side of a conventional
braking system. A petroleum lubricant will destroy your seals very quickly. I
had an oil leak on a Land Rover that soaked the boot on the clutch slave
cylinder. The boot swelled to about three times it's normal size in a couple
of days.

Rubber grease on the other hand is compounded from the same materials as brake
fluid.

Bill Lawrence

> From: simon.lachlan@homecall.co.uk
> To: healeys@autox.team.net
> Date: Fri, 27 Apr 2012 17:49:09 +0100
> Subject: [Healeys] Brake calliper seals
>
> Many thanks for all the replies. Well, I was doing almost everything
> right.....I've always managed before by sliding the boot over the cylinder,
> locating the seal into the piston and easing(!??**?) the piston inwards and
> finally locating the boot on the piston.
>
> Regarding the "almost everything", I had not noticed that the seals within
> the pistons, as supplied with the new kit, were simply too big. Luckily I
> had a pile of old ones and was able to go back to the original smaller
size.
> So, check the seals' size and save yourself some trouble.
>
> I used LM grease as a lubricant which, hopefully will be flushed out in the
> bleeding/fluid renewal process.
>
> A footnote on the inner seals' profile. I remembered them as being tapered
> and did find a reference to this in the Haynes manual:
>
> "9) To reassemble, first fit the internal seal, previously wetted with
> Castrol Girling Brake Fluid, into the groove in the cylinder bore with the
> scraping edge (smaller diameter) innermost".
>
>
>
> Simon
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