[Spridgets] Bad braking

Mark Haynes haynes386 at netzero.net
Mon Jan 20 08:26:21 MST 2014

Rick-He said DOT 3 and DOT 4 -NOT DOT 5, which is silicone. Castrol GT-LMA has
ALWAYS been synthetic, but NEVER Silicone. The DOT 3 CAN cause deterioration
of natural rubber seals, that is why we all like the GT-LMA, since its been
used forever with natural rubber seals and has a lower propensity to absorb
water (thus the LMA-Low Moisture Absorbance) than other brake fluids of the
Brian, you don't have to rebuild the whole system, but keep an eye on the
color of the brake fluid, if it starts to darken, then the DOT 3 has started
eating the rubber seals and THEN you need to rebuild the whole thing. I'd
flush the system, after I replace the hoses with new ones, with new GT-LMA.

Mark Haynes
It only goes one way-Pay it Forward

Subject: Re: [Spridgets] Bad braking
Message-ID: <D9F1ED86-13A3-4C0C-BA77-E640B0AD9168 at chartermi.net>
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Yikes!  Mixing glycol based brake fluid with silicone based fluid is a
definite bad thing.  I've heard it can cause lumps of goo in the various
cylinders.  This could even be the cause of your brake issues.  Most likely
it's bad hoses though.  A thorough flushing is in order.

And real racers don't use silicone brake fluid as it gives you a somewhat
spongy pedal under hard use.  Silicone "sponginess" is a good thing for
certain applications, but not brakes.  :-)

Sent from my keyboard

On Jan 18, 2014, at 10:20 AM, Brian Morse <owensdad74 at gmail.com> wrote:

> Thank you all for the great info!
> I had no idea the hoses would fail in that manner- very interesting.  I
give Peter C a shout on Monday.
> And I will try my hand at searching the archives.
> After double checking the fluid I put in I see I used Valvoline dot 3 and 4
SYNTHETIC fluid.  I never saw that (duh).  Do I really need to tear it apart
and rebuild the whole system?!?
> Bri

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