[Healeys] Brake Fluid

Bob Spidell bspidell at comcast.net
Wed Jun 13 07:51:25 MDT 2018

After we completely restored our BN2, it sat for several years while my 
dad dealt with some health problems.  When I started driving it again we 
found the brake fluid--IIRC it was Castrol DoT 4--had gelled, rendering 
the brakes all but inoperable.  Don't recall how we cleaned-out the 
system, but I put Pentosin DoT 4 in and we've had no problems since (I 
believe it was close to 10 years ago).  The car still sits for long 
periods, but has had no brake issues.

I haven't thoroughly researched it, but I think manufacturers calling 
any brake fluid 'synthetic' is a marketing ploy, as it's been a 
glycol--not a 'natural' substance--for many decades.  I think Pentosin 
is recommended for BMWs and other German cars (I put some Pentosin power 
steering fluid in my GF's old VW).  IIRC it's pretty expensive, but 
appears to be worth it.


On 6/13/2018 5:56 AM, Warren wrote:
> I’m about to do my bi-annual brake fluid replace. Been using Lucas 
> synthetic dot 4 with no problems over the years as Castrol became 
> extinct at my local Auto Zone. Now the dot 4 Lucas brand was not 
> available in dot 4, ok for dot 3, so I chose a brand called Pentosin 
> Super Dot 4. Anyone use this stuff? Lucas says “synthetic”, Pentosin 
> says “brake fluid” . I know it’s all supposed to be synthetic. Just 
> trying to avoid any potential problem.
> Thanks,
> WD  67BJ8
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10

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