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Author Topic: Brake fluid compatability  (Read 2265 times)
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John B
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« on: 27 July, 2015, 04:26:06 PM »

I have a label on top of the brake fluid reservoir saying......
"Use only type SABIF P2 SAE 70 RI"

On my bottles of Dot 4 fluid there is no reference to any of these numbers.
Not knowing what the previous owner may have topped it up with will it be safe to add a few drops of Dot 4?


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1961 Appia S3
1969 Fiat 850 Special
simonandjuliet
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« Reply #1 on: 27 July, 2015, 05:58:07 PM »

I use straight forward DOT 4 in the Appia, but then it is a new system , no old fluid at all.

If you are at all worried you could just flush the system with new clean fluid anyway, very easy on the Appia , as you know.
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S1 Aprilia Cabrio, S2 Aprilia, S1 Promiscuo,S2 camioncino, S2 furgoncino, , R4 Sinpar, R4 Rodeo, R60 Tractor,R60 S, Moto Guzzi Ercole, Disco 3, Mini ALL4 JCW, Moto Guzzi Cardellino 73,Fulvia Berlina GT, Fulvia Rallye S, Royal Enfield Himalayan
lancianut666
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Slow but rough


« Reply #2 on: 27 July, 2015, 06:28:35 PM »

Can you buy anything other than Dot 4?
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Fulvia Coupe S2 Flavia Coupe 1967 1.8 Kugelfischer Prisma 1.6 carb Y10 Fila Y10 Touring Dedra 1.8 Dedra 2.0 Turbo Appia S1
the.cern
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« Reply #3 on: 27 July, 2015, 08:01:56 PM »

Can you buy anything other than Dot 4?

Dot 5, but that is the silicon variety. There are arguments about whether it is necessary to remove all traces of non 5 fluid before introducing it or whether it may be introduced in a topping up scenario.

Personally John, I would flush out any old fluid with Dot 4 and continue to use just that. If  you are unsure as to what is in there at the moment I assume you do not know how old it is and under those circumstances total replacement is the safest way forward.

                                          Andy
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John B
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« Reply #4 on: 27 July, 2015, 09:17:25 PM »


Can you buy anything other than Dot 4?

Dot 5, but that is the silicon variety. There are arguments about whether it is necessary to remove all traces of non 5 fluid before introducing it or whether it may be introduced in a topping up scenario.

Personally John, I would flush out any old fluid with Dot 4 and continue to use just that. If  you are unsure as to what is in there at the moment I assume you do not know how old it is and under those circumstances total replacement is the safest way forward.

                                          Andy
I have a friend here with a couple of old Triumphs who only uses Dot 5 because he says "It does not affect paintwork if accidently spilled on it"

Thanks Simon and Andy for you response......of course you are both correct that a system flush is the way to go and I
will be doing that but hoping to delay until the car is off the road for winter.
Over the past 9 months or so since I bought the car the level in the reservoir has dropped a few millimetres so chances are I need to replace wheel cylinder seals etc........memo to self - contact Appia Consortium!

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fay66
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« Reply #5 on: 27 July, 2015, 10:12:32 PM »

In 60 years of driving & owning cars I can't ever remember brake fluid stripping paint unless you didn't clean it off, Minis were a prime example as it was nearly impossible to top up the M/Cylinder Reservoir without spilling fluid, but it was only if it had been left that there was a problem.
I've always used Dot 4 with My Dunlop Brakes and it's never been a problem, for 1600 HF with higher performance the Dot 5 might be worthwhile, although I think Dot 5 has other benefits, but it would certainly be beneficial to go along with Andy's recommendation of total replacement with fresh Dot 4.


Brian
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
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« Reply #6 on: 28 July, 2015, 08:33:43 AM »

Dot 5 does have higher boiling point but I still lost my brakes on the last bend of a very fast descent down Stelvio. ( fluvia 1600 sport with dot 5).

Other benefit of silicon is it is not hydroscopic which may be of interest if cars are stored in occasionally high humidity .....
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
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nistri
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« Reply #7 on: 03 August, 2015, 09:14:56 AM »

Dodgy seals in the master cylinder, Tim?
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Andrea Nistri

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