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abush

correct fluid

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Hi the clutch slave cylinder has stared leaking on my mk1 Cortina and I suspect it might have been caused by using the wrong hydraulic fluid attacking the seals. I am going to fix the problem but I want to make sure I use the correct fluid when I refill the system. I cant find any info anywhere on which one to use. Anyone know the answer to this?

cheers Alan

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Either DOT 4 or 5 brake fluid is what should be used. Any mineral oil will attack the seals, causing them to swell and turn to jelly.

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Ok thanks for the info I suspect this is what has already happened hence the leak

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Either DOT 4 or 5 brake fluid is what should be used. Any mineral oil will attack the seals, causing them to swell and turn to jelly.

Not sure that sounds right?, dot 5 didnt exist when cortina came out did it?, dot 4 mineral would be the correct fluid for std seals on a cortina, dot 5 is silicon based which is the one which cant be mixed with mineral based fluid, i'd stick to good ol Dot 4 its been around for decades,

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I run my GT on Silicone fluid, but I replaced/ rebuilt everything, so my system was dry, Veemax is correct, you can't mix dot 4 with Silicone fluid.

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I never suggested that DOT4 & 5 could be mixed. The OP asked what fluid could be used once the system had been sorted, and I stated (correctly) that either would be suitable.

So there!

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