On the other hand, I have always split the caliphers (works on Corvettes and
others why not a AH?).....no problems and much easier to deal with the
halves....I like to hone the cylinders to clean them up and you can't do that
when they are together.....putting the pistons in is easier when they are
split.....you do need a new rubber seal between the halves when reassembling
but they are available... I torque to about 40 lbs on the small bolts and 50
lbs on the large bolts.....suggest using the method Steve Byers recommends for
removing the pistons.
Steve Thomton
BJ7 Works Rally replica
--- On Fri, 6/27/08, BJ8 Healeys <sbyers@ec.rr.com> wrote:
From: BJ8 Healeys <sbyers@ec.rr.com>
Subject: Re: [Healeys] front calipers
To: healeys@autox.team.net
Date: Friday, June 27, 2008, 5:30 AM
Tom, it isn't necessary to separate the halves of the calipers to replace
the piston seals, and the shop manual discourages separating them anyway.
I've replaced seals more than once but never split the calipers.
You can use air pressure in the hydraulic inlet port to remove the pistons,
but
pad between them with a cloth or thin piece of wood and use caution because
they
come out suddenly when they release. Remove the outboard piston first while
holding the inboard piston in place with a C-clamp. You can't build
pressure on the outboard piston if you remove the inboard one first. Once
the
pistons are out, examine them for damage or rust on the outer surface that
could cause binding. I recommend stainless pistons if yours are rusty.
Reinstalling the pistons and seals is a bit fiddly due to the small
clearances,
but can be done easy enough. Lubricate the pistons and seals with silicone
fluid before installing them.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
---- T W <ah3000me@gmail.com> wrote:
> I have 40+ year old rubber in my front brake calipers. The PO replaced
the
> rear wheel cylinders, the master cylinder, and all the flex lines, so this
> is the last bit of old rubber in the brake system. The PO also changed
> the fluid over to DOT 5.
>
> I'd like to replace the seals in the front calipers, and I have a few
> questions.
>
> How hard is it to pull the two caliper halves apart?
>
> Since there are pistons in both halves, do these calipers tend to have
> problems with the fluid passageways clogging over time?
>
> Some of the big auto parts list rebuilt calipers for these cars at pretty
> reasonable prices. I like pulling things apart -- but would I be better
off
> with a rebuilt caliper?
>
> thanks for any advice,
>
> Tom
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