[DeTomaso] Front Brake Caliper Piston Sticking

[Pantdino]

My car has the stock front calipers which have been modified by Hall many years ago.  He said as they came from the factory not all the pistons got full pressure and after modification I didn't need to bleed the lower valve..
 
When I rebuilt my calipers I noted the top bleed valve is not actually at the top of the caliper cavity, so there is some air space above it.  I had to put a piece of wood between the pads and hold the caliper at an angle during the bleeding process to get all the air out.  Without doing that I couldn't get a firm pedal.

Jim Oddie
 
 
-----Original Message-----
From: Mike Drew via DeTomaso <detomaso at poca.com>
To: guido_detomaso <guido_detomaso at prodigy.net>; detomaso <detomaso at POCA.com>
Sent: Sat, Jan 2, 2016 10:01 pm
Subject: Re: [DeTomaso] Front Brake Caliper Piston Sticking

In a message dated 1/2/16 6:57:43 PM, guido_detomaso at prodigy.net
   writes:

 Who is "Guy"?

   >>>Uh...YOU are.  That's your name.  Guy Dellavecchia.  Remember? :>)

     >Anyway, are the original style of brake hose still available?
     Maybe I could spring for new ones.

   >>>They're available but obscenely expensive compared to modern braided
   stainless steel lines.  They are likely very, very old as well.  Just
   as you wouldn't (reasonably) buy 30-year-old crusty tires, it makes no
   sense to buy old rubber brake hoses.  The braided stainless/teflon
   hoses are much less expensive, work better, and last forever.

     >Probably will bleed the front brakes / change the fluid when I get
     a chance, like summertime.  Does anyone still remove the calipers
     and bleed them in different orientations, tap them with a hammer to
     help release any air bubbles, or is that more or less considered a
     voodoo ritual now ?

   >>>I suppose the procedure has some merit, but it does seem a bit
   ritualistic as you say.  The stock front calipers can have one or two
   bleeders, depending on whether they have been modified.  The stock
   setup uses external fluid transfer lines to feed the front and rear
  chambers, and a pair of bleeders.
   When you buy replacement lines you have to specify whether they are for
   the stock calipers, Corvette, or Wilwood, as all three are commonly
   found, and all have different-style connections at the caliper end.

     >See separate report on Anti-Football ...

   >>>See separate reply. :>)
   Mike
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-------------- next part --------------
   My car has the stock front calipers which have been modified by Hall
   many years ago.  He said as they came from the factory not all the
   pistons got full pressure and after modification I didn't need to bleed
   the lower valve..



   When I rebuilt my calipers I noted the top bleed valve is not actually
   at the top of the caliper cavity, so there is some air space above
   it.  I had to put a piece of wood between the pads and hold the caliper
   at an angle during the bleeding process to get all the air out.
   Without doing that I couldn't get a firm pedal.



   Jim Oddie





   -----Original Message-----
   From: Mike Drew via DeTomaso <detomaso at poca.com>
   To: guido_detomaso <guido_detomaso at prodigy.net>; detomaso
   <detomaso at POCA.com>
   Sent: Sat, Jan 2, 2016 10:01 pm
   Subject: Re: [DeTomaso] Front Brake Caliper Piston Sticking
   In a message dated 1/2/16 6:57:43 PM, [1]guido_detomaso at prodigy.net
   writes:
   Who is "Guy"?
   >>>Uh...YOU are. That's your name. Guy Dellavecchia. Remember? :>)
   >Anyway, are the original style of brake hose still available?
   Maybe I could spring for new ones.
   >>>They're available but obscenely expensive compared to modern braided
   stainless steel lines. They are likely very, very old as well. Just
   as you wouldn't (reasonably) buy 30-year-old crusty tires, it makes no
   sense to buy old rubber brake hoses. The braided stainless/teflon
   hoses are much less expensive, work better, and last forever.
   >Probably will bleed the front brakes / change the fluid when I get
   a chance, like summertime. Does anyone still remove the calipers
   and bleed them in different orientations, tap them with a hammer to
   help release any air bubbles, or is that more or less considered a
   voodoo ritual now ?
   >>>I suppose the procedure has some merit, but it does seem a bit
   ritualistic as you say. The stock front calipers can have one or two
   bleeders, depending on whether they have been modified. The stock
   setup uses external fluid transfer lines to feed the front and rear
   chambers, and a pair of bleeders.
   When you buy replacement lines you have to specify whether they are for
   the stock calipers, Corvette, or Wilwood, as all three are commonly
   found, and all have different-style connections at the caliper end.
   >See separate report on Anti-Football ...
   >>>See separate reply. :>)
   Mike
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References

   1. mailto:guido_detomaso at prodigy.net
   2. mailto:DeTomaso at poca.com
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