Ferrari Mailing List: Re: Playing with the 308

[Rick Lindsay (rolindsay]

My guess is that the "don't split the caliper" stuff
is because of two things; (1) the ham-fisted amateur
brake-pad swapper could cause a nasty accident, and
(2) legal boiler-plate.

rick
--- Jeff Greenfield <coyote [at] acme-ltd.com> wrote:

> Larry -
> 
> The 308 calipers are nothing special, just your
> average two piston ATE  
> calipers.
> 
> I've rebuilt 100s of these calipers over the past 20
> years, and I've  
> probably split all of them despite the warnings not
> to.
> 
> Never had a problem with any of them, other than
> some pistons that  
> were so frozen that they would not come apart.
> 
> As mentioned, just don't lose the o rings between
> the sections as they  
> do not come in the kits.
> 
> Jeff
> 
> Sent from my iPhone
> 
> On Jan 24, 2008, at 2:42 PM, "LarryT"
> <l02turner [at] comcast.net> wrote:
> 
> > Hi Bob,
> > Sounds like you're having a lot of fun!   BTW, 
> most of the calipers  
> > I've
> > rebuilt have included numerous warnings about not
> splitting the  
> > caliper
> > halves - calipers like Teves, Bendix and others. 
> I assume the Ferrari
> > caliper is different?   The others seem worried
> the special sealing  
> > surfaces
> > between caliper halves may not be put back
> together properly.
> >
> > Is it a problem?
> >
> > Larry T (67 MGB, 74 911, 78 240D, 91 300D)
> > www.youroil.net for Oil Analysis and Weber Parts
> > Test Results http://members.rennlist.com/oil
> > PORSCHE POSTERS!  youroil.net
> > Weber Carb Info
> http://members.rennlist.com/webercarbs
> > .
> >
> > ----- Original Message -----
> > From: <robert_h_bowser [at] juno.com>
> > To: "Larry Turner" <l02turner [at] comcast.net>
> > Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
> > Sent: Thursday, January 24, 2008 1:24 PM
> > Subject: Re: [Ferrari] Playing with the 308
> >
> >
> >> Matt -
> >>
> >> Right after I bought the car, I went through all
> the calipers,
> >> disassembling and cleaning each one.  A few
> months ago, I went  
> >> through
> >> them again, this time replacing the inner and
> outer seals.  Both  
> >> times,
> >> pistons and caliper bodies were in good shape. 
> Just needed cleaning.
> >> Other than squealing and related pad noise, I've
> never had any  
> >> problems
> >> with the brakes.
> >>
> >> Fronts are easy.  Do have to break the pistons
> free using  
> >> compressed air
> >> prior to disassembling the caliper into inboard
> and outboard  
> >> halves.  And
> >> remember to save the four rubber o-rings sealing
> the fluid channels
> >> between the two halves.  When re-assembing,
> position the 'C' face  
> >> of the
> >> piston so the open portion of the 'C' is facing
> the leading portion  
> >> of the
> >> rotating disk.
> >>
> >> Rears are easy if you remember to remove the
> pistons using the  
> >> allen-head
> >> screws hidden under the plugs on each side of the
> caliper.   Just  
> >> about
> >> impossible if you don't.   When re-assembling,
> set the pad  
> >> clearance by
> >> screwing down the pad till it seats rests firmly
> on the disk, then  
> >> back
> >> off the screw about a third of a turn.  If you
> didn't resurface/ 
> >> replace
> >> the disk and pads, you will need to re-adjust the
> clearance again  
> >> shortly.
> >>
> >> Above applies to the early model brake system
> (i.e., '78 308GTS  
> >> vintage).
> >> I don't know when (or if) they changed the
> caliper types for newer  
> >> models.
> >>
> >> Damn, it's raining again.  Guess I'll have to go
> play with the  
> >> Ferrari in
> >> the garage again today....
> >>
> >> God, I love retirement!
> >>
> >> Bob
> >> '78 308GTS
> >> '01 Corvette Z06
> >>
> >> -- "Matt Boyd" <ferrari308driver [at] gmail.com>
> wrote:
> >> Bob,
> >>
> >> Thanks for the on-topic posting!
> >>
> >> I wonder if you can discuss the caliper
> rebuilding.  Why did you
> >> decide to rebuild them (what was wrong?)?  What
> was the cost of
> >> replacement vice rebuilding?  Did you run into
> any problems
> >> rebuilding?
> >>
> >> I've rebuilt calipers once on an '88 Rolls and it
> was fairly
> >> straightforward, although I had a tough time
> separating the halves of
> >> the calipers.
> >>
> >> Any tips or tricks on the 308?
> >>
> >> -Matt
> >> '85 euro 308
> >>
> >> On Jan 23, 2008 11:29 PM,
> robert_h_bowser [at] juno.com
> >> <robert_h_bowser [at] juno.com> wrote:
> >>> Bit of a cold, rainy day here in Southern Cal,
> so I decided to  
> >>> spend some
> >>> quality garage time with my mistress.  A while
> ago, I'd bought a  
> >>> new set
> >>> of front pads and a set of stainless braided
> brake lines.  Brake  
> >>> pads
> >>> still had some meat on them, but they were
> squealing badly.   
> >>> Thought new
> >>> ones might fix that.  Also been having a problem
> with groaning in  
> >>> the
> >>> front suspension.  Sounded like a '52 Chevy
> every time I went over a
> >>> speed bump.  Changing the brake lines pretty
> much requires  
> >>> removing the
> >>> front A-arms simply to get clearance, so I
> thought it was a good  
> >>> time to
> >>> lube the bushings.
> >>>
> >>> A long time ago, I'd gotten new Energy
> Suspension A-arm bushings.
> >>> Several of us on the list had gotten together
> and bought in bulk.   
> >>> Anyone
> >>> remember that?  I think it was back in 2000 or
> so.  Problem was  
> >>> the guy
> >>> who did it was told the front and rear used the
> same size, so we all
> >>> ended up with two sets of front.  I remember
> returning the extra  
> >>> set to
> >>> someone who was supposed to get them
> exchanged....but that was  
> >>> long ago
> >>> and far away.....never got anything
> back....whatever.
> >>>
> >>> I did get the new bushings installed on the
> front A-arms a year or  
> >>> so
> >>> ago, but the guy who welded the bushings in did
> not disassemble them
> >>> prior to doing the welding.  The bushings come
> assembled, but need  
> >>> to be
> >>> taken apart prior to the welding operation.  If
> you weld them as a  
> >>> unit,
> >>> the plastic insert gets damaged.  The assembly
> consists of an  
> >>> outer metal
> >>> shell, an inner hard plastic sleeve, and inside
> that, a metal  
> >>> sleeve.
> >>> Plus a rubber donut for the outer side of the
> bushing.  The design  
> >>> of the
> >>> bushing is that the outer shell (welded to the
> A-arm) is supposed to
> >>> rotate with respect to the inner metal sleeve as
> outer point of  
> >>> the A-arm
> >>> (attached to the wheel hub) moves up and down. 
> Prior to re- 
> >>> installing
> >>> the A-arms, I had disassembled the bushings and
> lubed them with  
> >>> grease,
> >>> but I guess it was too heavy, as the two metal
> sleeves were locked
> >>> together with the plastic sleeve.  If I left the
> mounting bolts  
> >>> loose,
> >>> the front end would be a little loose.  If I
> tightened them down,  
> >>> the
> >>> bushings would groan.
> >>>
> >>> So....anyway, this time I lubed them with
> vaseline.  Hope that  
> >>> will last
> >>> for a while.  We'll see.  I did a static test,
> and they seemed to  
> >>> move
> >>> freely with no noise.
> >>>
> >>>
> >>> While I was at it, I decided to get new bushings
> for the front  
> >>> sway bar.
> >>> Those are on order.  Hope to have everything
> back together by this
> >>> weekend.  The new braided brake lines do look
> cool.  Hope I can  
> >>> tell a
> >>> difference.
> >>>
> >>> So....now I have pretty much rebuilt the entire
> front suspension.   
> >>> New
> >>> bushings.  Recently replaced the shocks, rotors
> and rebuilt the  
> >>> calipers.
> >>> Only thing left is the steering rack.  Think
> I'll wait on that.   
> >>> Probably
> >>> should do the rear suspension next.
> >>>
> >>> Nice being retired so I can take the time to
> play with the 308.   
> >>> Quality
> >>> time.  Life is good.
> >>>
> >>> Bob
> >>> '78 308GTS
> >>> '01 Corvette Z06
> >>>
>
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