[DeTomaso] Stock brake calibers & other musings

[eb0711 at kolumbus.fi]

The orange stuff may have been copper paste from the assembly. I had a 
tablespoon of that stuff in the outer piston bores.

-Janne

5/14/2013 2:12 PM, Will Kooiman kirjoitti:
> That was my feeling too.  My car's brakes were scary at first.  I didn't
> rebuild the calipers, but I switched to Porterfield pads, plus I bled the
> brakes correctly and switched to braided steel lines.  The difference was
> incredible.  It stopped as fast as my wife's Boxster-S, and that's saying
> a lot, especially since it had 911 Turbo Brembo brakes.
>
> I know one of the big problems was the brake fluid.  When I bled them,
> orange fluid (rust) came out.  Another big problem was the original pads.
> I believe in Porterfield R4S pads, but I also think I would have improved
> stopping from any new pads.
>
> BTW, you are correct about the solid rotors.  They stop great, but once
> you drive hard, they overheat.  After a cruise through the Sam Houston
> forest, we stopped for a break, and smoke was coming out from under my
> front wheels.  That's when I decided I needed vented rotors.  I had been
> breaking hard, but not *that* hard.
>
> --
> Will
>
>
>
>
>
> On 5/14/13 3:36 AM, "eb0711 at kolumbus.fi" <eb0711 at kolumbus.fi> wrote:
>
>> Have been driving around with the rebuilt stock brakes with Porterfield
>> pads. I appreciate this may not be greatest news, but I've got to admit
>> I'm surprised how well it brakes. Not sure how good thin, stock style,
>> rotors are for track use, but I really like what I got with small
>> investment and elbow grease.
>>
>> -Janne
>>
>> 4/30/2013 1:12 PM, eb0711 at kolumbus.fi kirjoitti:
>>> I rebuilt my stock front brake calibers recently and took them fully
>>> apart while on that. I'm sure many know, but thought I'd share for the
>>> benefit of other newbies:
>>>
>>> - Calibers seem like a decently nice design with big and little pistons,
>>> with some oddities in fluid distribution by strange tubing arrangement.
>>> - Outer pistons are individually at a dead end, meaning the fluid will
>>> not change there, when you bleed them just for changing the fluid. Would
>>> really need to squeeze the outer pistons to the bottom to get most of
>>> the old fluid out from there.
>>> - Changing rotors it's important to have the rotor and hub mounting
>>> surfaces very clean and make sure the rotor is perfectly seated against
>>> the hub. Otherwise the rotor will wobble and grab the pads at some point
>>> of rotation. Easy to be sloppy here. :)
>>> - Only way to use thicker ventilated rotors with stock calibers would be
>>> to build a spacer to fit between caliber halves and use longer bolts. I
>>> wonder if someone already makes them?
>>> - Noticed also that the Porterfield pads have 1mm thicker (~20%) steel
>>> backing plates than stock pads. So it's not just the compound, but
>>> stiffness and (maybe?) heat handling improvement.
>>>
>>> -Janne
>>>
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