[Healeys] Brake Fluid

[Richard Collins]

Just to keep the thread alive, I use DOT 4 in all  8 of our family cars and 3 motorcycles and do all the brake work on them (fluid, rotors, pads, calipers,  drums, brake lines etc), including the 2 race cars (which use high heat versions) and the BN7.
I also have a small ball point pen size moisture meter to test the fluid and it works well. I know Silicon DOT5 needs to be used on totally new systems. Friends that used it in new systems love it.  But I know mixing it with another DOT 3 or 4 can cause jelling if it gets contaminated. So I only keep DOT 4 on my shelf.

Regards,
Richard C
BN7 440


On Oct 31, 2022, at 20:32, WILLIAM B LAWRENCE <ynotink at msn.com> wrote:


Bob, I’d say more of a problem on all of the hundreds because the front bleeder screws are on the lower slave cylinders.
________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of Mark Donaldson <ardmorebusiness at xtra.co.nz>
Sent: Monday, October 31, 2022 10:06 PM
To: 'Bob Spidell' <bspidell at comcast.net>; healeys at autox.team.net <healeys at autox.team.net>
Subject: Re: [Healeys] Brake Fluid


DOT5 and DOT 5.1 are NOT compatible.



I’ve have been using Bel-Ray DOT5 SBF in my BN2 and my tri-carb since 1992.

I’ve never had a problem.



Mark

Ardmore, NZ



From: Bob Spidell <bspidell at comcast.net>
Sent: Monday, 31 October 2022 5:35 PM
To: healeys at autox.team.net
Subject: Re: [Healeys] Brake Fluid



"... There is a newer Glycol Ester DOT5 ..."

I think you're referring to 'DoT5.1'  I also think it was deliberately named so as to confuse the issue.


On 10/30/2022 8:05 PM, Christopher Moog via Healeys wrote:

I've used both. Currently prefer DOT4.

Also everyone is speaking of DOT5 but there are now two different DOT5s. The first is the older silicone based DOT5. There is a newer Glycol Ester DOT5 that is compatible with DOT3 and DOT4. It has a lower viscosity than the DOT3 and DOT4 so it works better in some ABS systems. It also has a higher boiling point than DOT3 and DOT4. Don't see an advantage in Healeys.


On 10/30/2022 10:00 PM, Alan Seigrist wrote:

The best selling point for Dot 4 is you can mix any Dot 4 or even Dot 3 if you need to fill up.  As I understand it with Dot 5 you should be careful to always use the same brand to fill up if necessary.

Also, neither Dot 5 not Dot 4 is great for sitting a long time, Dot 4 absorbs water, Dot 5 will push any water down into the components.

Dot 4, if the car is not used regularly, needs to be flushed every couple of years.




On Mon, Oct 31, 2022 at 5:43 AM Michael MacLean <springer.mike51 at gmail.com<mailto:springer.mike51 at gmail.com>> wrote:

At this point in the restoration I have a completely rebuilt brake system with all new components and tubing.  Now is the time to make the decision to use DOT 4 or Silicone.  What's the consensus, if there is one?

Mike MacLean





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