[Healeys] silicone brake fluid

Kees Oudesluijs coudesluijs at chello.nl
Sun Jun 16 07:07:22 MDT 2019


The main problem with Silicon fluid/DOT 5 is that it hardly absorbs 
water, so when water enters the sytem (due to condensation) it will sink 
to the lowest point and causes corrosion and havoc. On it own not a big 
problem if you renew the fluid every 2 years or so, as you also would do 
with DOT 4, but most people using DOT 5 never replace the fluid.

Some manufacturers do not recommend DOT 5 hence the warning “Using 
Silicon Brake fluid will void warranty”.

Perhaps the grease they use in the factory at assembly is not compatible 
with DOT 5.

Perhaps some rubber items are not suitable for DOT 5, however my 
understandig is theat DOT is OK with new rubber parts as long as you 
first clean them using alcohol/meth. spirits and dry them thoroughly.

Once the rubber parts have been exposed to DOT 4 you should not use them 
with DOT 5 or vise versa. Some people do at their own peril.

Kees Oudesluijs



Op 15-6-2019 om 17:14 schreef Brian Drab:
>
> Last week I completed a driving tour in our BJ8. It was a great tour 
> and everything ran well except for one thing.  4 or 5 times, when I 
> used the clutch, the clutch master cylinder bypassed. The rest of the 
> time it worked well. As I don’t want to be caught without a clutch at 
> a later date I am changing the clutch master cylinder. I have received 
> a replacement and am preparing to install it.
>
> On the box is a quick summary of the bleeding procedure under a 
> warning – “Using Silicon Brake fluid will void warranty”. I have used 
> silicon fluid for well over 10 tears and never experienced any 
> problems with it and have never seen or heard of this type of warning 
> before. I have never heard of any destructive qualities of Silicon fluid.
>
> My question is – does anyone have any idea what it is about.
>
> For me to change to Dot4 fluid is quite a big deal as I would be 
> changing out the clutch as well as the brake system seeing as they 
> share a common reservoir.
>
> I’d appreciate any comments on the warning.
>
> Brian Drab
>
> BJ8
>
>
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