DOT 3 and DOT 4 brake fluids are compatible with each other and may be
interchanged or mixed with no ill effects except the boiling points are
different. A mixture which includes DOT 3 must be treated as being wholly
DOT 3.
The table below shows MINIMUM wet and dry boiling points for DOT 2, 3, 4,
and 5 brake fluid in degrees Fahrenheit.
DOT 2
DOT 3
DOT 4
DOT 5
Dry Boiling point
374
401
446
500
Wet boiling point
284
311
356
The DOT 2 spec is for drum brakes and is obsolete. If you have any DOT 2 in
your garage, throw it away!
DOT 5 is silicone brake fluid. Silicone brake fluid (DOT 5) is NOT
compatible with regular brake fluid, it is hard to pour without introducing
bubbles and can result in soft pedal feel. Moisture still gets into your
system and it will pool in low areas such as callipers. It may therefor
encourage rapid corrosion rather than be obsorbed in the fluid and it will
destroy seals if they have already used for normal brake fluid. Fully
cleaned components and new seals will be OK. Basically, stay clear unless
you have a need for it.
In some Countries there is DOT 5.1 which may get called Super or Supreme DOT
4. Don't know anything about that other than it has a higher boiling point
than normal DOT 5. Whether or even if it is missable with another DOT
standard is also unknown.
Guy R Day
PS Brad, sorry I can't help, but good luck in getting the slave cyl
sorted.
----- Original Message -----
From: <ryan.kubanoff@comcast.net>
To: <spridgets@autox.team.net>
Sent: Sunday, June 15, 2008 4:30 AM
Subject: Re: [Spridgets] HELP!!!!!
> Brad ,
> the problem may have been what brake fluid you used DOT 4 vs DOT 3. If
> you put the wrong fluid in it eats the seals. I bought a new master and
> slave from victoria british for about $100. As for bleeding the system I
> used a piece of tubinmg and a 50 ml syringe.
> ryan
>
> -------------- Original message --------------
> From: "Brad Fornal" <tequila.brad@gmail.com>
>
>> I got the reworked clutch master back from White Post on Tuesday. Put it
>> in
>> the car that night, and on Wednesday, tried to bleed the system. It
>> didn't
>> work, it kept putting out bubbles, and I didn't know why. I stopped,
>> because
>> I was getting pissed (that is US for angry, not drunk), and it is never
>> good
>> to work on your car when you are pissed.
>> Today, I get back out to the car, and there is a puddle under it. This
>> one
>> is coming from the right side. I crawl under, and see that the slave is
>> now
>> shot. With a week to go until LotO, I now need a 68 clutch slave.
>> AutoZone
>> wants $25 for the seal, and three to five days to get it to me.
>> Peter, Ed, anyone with one on the shelf that is in good shape....??
>>
>> HELP!!!!
>>
>>
>> --
>> DON JULIO 1942
>>
> http://autox.team.net/mailman/listinfo/spridgets
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