[DeTomaso] DoT 3 vs. DoT 4 for brakes

[Larry Weston]

How do you drain the calipers? Anything short of removing the calipers and inverting them to put the bleeder at the lowest point during your pressure/vacuum operation will leave the wrong stuff behind, no? Even that might be questionable considering the internal porting between the inner and outer sections of typical front calipers. Only absolutely sure method to really get it right is as below: disassembly, cleaning and reassembly of the entire system.


> From: steve at snclocks.com
> To: detomaso at poca.com
> Date: Sat, 4 Apr 2015 18:55:24 -0700
> Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
> 
> When I buy a car with Dot 3/4 I drain out the fluid, fill the reservoir with 91% isopropyl alcohol, pressure it through the system to clean out the 3/4, then evacuate through each corner with vacuum (the engine makes a great vacuum source).  When dry I refill with Dot 5 and bleed appropriately.  Works like a champ.  
> 
> Stephen Nelson
> 
> 
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Pantdino via DeTomaso
> Sent: Saturday, April 04, 2015 2:12 PM
> To: shbailey at att.net; detomaso at poca.com
> Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
> 
> 
> That's a whole other discussion.
> If you switch to it, technically you should disassemble the entire braking system and clean out the old fluid because whatever non-silicone fluid is in there will have some moisture in it and corrode the system wherever it is.
> Also, it tends to trap air bubbles and give a squishy pedal.
>  
> That said, millions of people use silicone fluid and don't have problems.
>  
> But its mainly for collector cars where a bit of paint damage below the master cylinder would be catastrophic and they are not driven very hard.
>  
>  
> -----Original Message-----
> From: Sam <shbailey at att.net>
> To: Detomaso Forum <detomaso at poca.com>
> Sent: Sat, Apr 4, 2015 4:50 am
> Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
> 
> 
> I only use a DOT 5 (Silicone) in my non ABS cars including the Pantera.
>    Does
> not absorb moisture like DOT 3 and 4, does not eat paint, and
>    never has
> leaked for me.
> 
>  
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-------------- next part --------------
   How do you drain the calipers? Anything short of removing the calipers
   and inverting them to put the bleeder at the lowest point during your
   pressure/vacuum operation will leave the wrong stuff behind, no? Even
   that might be questionable considering the internal porting between the
   inner and outer sections of typical front calipers. Only absolutely
   sure method to really get it right is as below: disassembly, cleaning
   and reassembly of the entire system.
   > From: steve at snclocks.com
   > To: detomaso at poca.com
   > Date: Sat, 4 Apr 2015 18:55:24 -0700
   > Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
   >
   > When I buy a car with Dot 3/4 I drain out the fluid, fill the
   reservoir with 91% isopropyl alcohol, pressure it through the system to
   clean out the 3/4, then evacuate through each corner with vacuum (the
   engine makes a great vacuum source). When dry I refill with Dot 5 and
   bleed appropriately. Works like a champ.
   >
   > Stephen Nelson
   >
   >
   > -----Original Message-----
   > From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of
   Pantdino via DeTomaso
   > Sent: Saturday, April 04, 2015 2:12 PM
   > To: shbailey at att.net; detomaso at poca.com
   > Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
   >
   >
   > That's a whole other discussion.
   > If you switch to it, technically you should disassemble the entire
   braking system and clean out the old fluid because whatever
   non-silicone fluid is in there will have some moisture in it and
   corrode the system wherever it is.
   > Also, it tends to trap air bubbles and give a squishy pedal.
   >
   > That said, millions of people use silicone fluid and don't have
   problems.
   >
   > But its mainly for collector cars where a bit of paint damage below
   the master cylinder would be catastrophic and they are not driven very
   hard.
   >
   >
   > -----Original Message-----
   > From: Sam <shbailey at att.net>
   > To: Detomaso Forum <detomaso at poca.com>
   > Sent: Sat, Apr 4, 2015 4:50 am
   > Subject: Re: [DeTomaso] DoT 3 vs. DoT 4 for brakes
   >
   >
   > I only use a DOT 5 (Silicone) in my non ABS cars including the
   Pantera.
   > Does
   > not absorb moisture like DOT 3 and 4, does not eat paint, and
   > never has
   > leaked for me.
   >
   >
   > _______________________________________________
   >
   > Detomaso Forum Managed by
   > POCA
   > Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list
   DeTomaso at poca.com http://poca.com/mailman/listinfo/detomaso_poca.com
   >
   > To
   > manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   >
   >
   >
   >
   > _______________________________________________
   >
   > Detomaso Forum Managed by POCA
   > Posted emails must not exceed 1.5 Megabytes
   > DeTomaso mailing list
   > DeTomaso at poca.com
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