[Roadsters] Brake fluid recommendations

[Gary McCormick]

Environmental moisture finds its way into your car’s hydraulic systems any time the reservoir is uncapped, and who knows how else. I lost clutch function in the ’76 BMW 3.0 Si I used to own because a little bead of water that had collected in the lowest point in the system, which happened to be the clutch slave cylinder, froze—and then, when I pushed in the clutch pedal the first thing in the morning, that little ice chunk tore the seal.
Gary McCormickSan Jose, CA’70 2000, SRL311-13291


 

    On Monday, May 6, 2019, 6:13:06 AM PDT, dave via Datsun-roadsters <datsun-roadsters at autox.team.net> wrote:  
 
 
You are just plain wrong with that comment on silicone based fluids.  It may perhaps be true that if you get water in the line it won’t be absorbed by the brake fluid.  How are you getting water in the line?

  

In fact, dot 3 / 4 is hygroscopic, which means it absorbs water.  So actually dot 3 / 4 is actually much more of a culprit.

  

From: Datsun-roadsters <datsun-roadsters-bounces at autox.team.net> On Behalf Of Paul Courson via Datsun-roadsters
Sent: Monday, May 6, 2019 4:44 AM
To: Pat Horne <patintexas at icloud.com>
Cc: datsun-roadsters: autox.team. net <datsun-roadsters at autox.team.net>
Subject: Re: [Roadsters] Brake fluid recommendations

  

Wow, thanks for the heads-up!

  

That was the first DOT 4 rated fluid I started using, probably 30 years ago, in brakes and clutch hydraulics.

  

Have to do some research for a successor. I would still avoid silicone-based fluid for any car that sits a lot. Water will collect and rust the line.

  

Paul/Annapolis

  

On Sun, May 5, 2019, 21:54 Pat Horne via Datsun-roadsters <datsun-roadsters at autox.team.net wrote:


I’ve been using Castrol LMA brake fluid in my vehicles since the 70’s. I just went looking for LMA @ found that Castrol doesn’t make it any more!  What is the current brake fluid for our roadsters?

I’ve been using LMA in all my vehicles but my “new” car is a 2006. 

Peace,
Pat

Pat Horne 
We support Habitat for Humanity


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