"Nathan Lucas" <lucas.autotrash@tesco.net> wrote in message
news:jpwfe.4288$6W2.1110@newsfe2-gui.ntli.net...
>
> "Chris Bartram" <news@delete.me.piglet-net.net> wrote in message
> news:Ifwfe.28017$G8.26303@text.news.blueyonder.co. uk...
>>
>> > it is good practice to open the bleed nipple when you push the piston
> back.
>> > some abs systems get upset if you don't, and there is a (small) risk of
>> > inverting the seals in the master cylinder.
>>
>> I'd read that. I've never done it in the past on my old
>> scirocco/golf/Ibiza etc, but the A3 I have now has ABS so it seems
>> sensible. Apparently the MkIII Vauxhall Astra is particularly prone to
>> the master seals inverting if you don't use that method.
>
> my last car was a J reg mk3 astra. i only read that you should undo the
> nipples a few months ago, so it's something that i've never done until
> now.
> that said, now i know the potential problems you can cause i always do.
>
>
When I worked in the power industry we used silicone grease on "O" rings
which had to withstand 1500 lb/in sq and 150 deg C, as recommended by the
manufacturers. I have used Copaslip on brake calipers on many occasions
without problems, the trick being to apply a smear sparingly and not lather
it on too heavily.

Pilgarlick

 

"Nathan Lucas" <lucas.autotrash@tesco.net> wrote in message
news:jpwfe.4288$6W2.1110@newsfe2-gui.ntli.net...
>
> "Chris Bartram" <news@delete.me.piglet-net.net> wrote in message
> news:Ifwfe.28017$G8.26303@text.news.blueyonder.co. uk...
>>
>> > it is good practice to open the bleed nipple when you push the piston
> back.
>> > some abs systems get upset if you don't, and there is a (small) risk of
>> > inverting the seals in the master cylinder.
>>
>> I'd read that. I've never done it in the past on my old
>> scirocco/golf/Ibiza etc, but the A3 I have now has ABS so it seems
>> sensible. Apparently the MkIII Vauxhall Astra is particularly prone to
>> the master seals inverting if you don't use that method.
>
> my last car was a J reg mk3 astra. i only read that you should undo the
> nipples a few months ago, so it's something that i've never done until
> now.
> that said, now i know the potential problems you can cause i always do.
>
>
When I worked in the power industry we used silicone grease on "O" rings
which had to withstand 1500 lb/in sq and 150 deg C, as recommended by the
manufacturers. I have used Copaslip on brake calipers on many occasions
without problems, the trick being to apply a smear sparingly and not lather
it on too heavily.

Pilgarlick