Best Brake fluid and how much do I need?

watchcam · **Posted:** Tue Nov 10, 2009 10:09 am

Hi All,

Any advice on good brand and how much do I need?

Thanks
Regards
Paul

Brett928S2 · **Posted:** Tue Nov 10, 2009 11:34 am

Hi

Any major make will do...like Lockheed or Castrol or Motul...

Personally I use the 5.1 Synthetic (Motul) but really you need to drain ALL the old stuff if you will use synthetic...

Quantity, I will post tonight when I am near my manuals...

All the best Brett

watchcam · **Posted:** Tue Nov 10, 2009 11:41 am

Thanks Brett,

Re the draining .... How clean does the system need to be to be considered drained?

What I mean is just opening the plug and letting it all run out ok, or do I need to get it blown through or flushed out with something before re filling?

Thanks
Regards
Paul

Brett928S2 · **Posted:** Tue Nov 10, 2009 1:20 pm

watchcam wrote:

Thanks Brett,

Re the draining .... How clean does the system need to be to be considered drained?

What I mean is just opening the plug and letting it all run out ok, or do I need to get it blown through or flushed out with something before re filling?

Thanks
Regards
Paul

Hi Paul

Undo all the bleed nipples and allow them all to drain (use plastic or rubber tubes into bottles and pump pedal until all drained out)

Then leave for a while to drain further....

Then refill..if using 5.1 (synthetic) it WILL mix ok with ordinary grade fluid anyway...

All the best Brett

watchcam · **Posted:** Tue Nov 10, 2009 1:33 pm

Great, thanks Brett ..... get some synthetic stuff then. Something needs to make the brakes feel better. They are shocking!
Regards
Paul

lightning · **Posted:** Tue Nov 10, 2009 5:41 pm

The jury is still out over synthetic brake fluid. I'd just use a good DOT 4 specification.

If the brakes are "shocking" then there's clearly a major fault. Unless you have air in the system, or the fluid has never been replaced, it won't be that.

Brett928S2 · **Posted:** Tue Nov 10, 2009 6:15 pm

lightning wrote:

The jury is still out over synthetic brake fluid. I'd just use a good DOT 4 specification.

If the brakes are "shocking" then there's clearly a major fault. Unless you have air in the system, or the fluid has never been replaced, it won't be that.

Hi

Synthetic brake fluid has been around for years, it has several advantages over normal fluid, firstly its not "hygroscopic" which means unlike normal fluid it will not absorb water...secondly it improves or lessens "brake fade" on trackdays etc as it has a higher boiling point.

Personally it improved my pedal slightly (made it firmer)

But you are correct, "shocking" brakes is extremely unusual for a 928 and its not normally the fluid...pads or discs maybe....but it cannot do any harm to change the fluid anyway....

All the best Brett

watchcam · **Posted:** Tue Nov 10, 2009 8:29 pm

Hi Guys,

The pedal doesnt seem to have much as much effect as I would like and I need to press very hard to get much braking. Having said that it did pass brake test in MOT the other day (but only just)
Given the car sat for 8 or 9 months I am going to change the fluid and see what happens.
The pads are pretty fresh and discs in good nick as well.
One of the calipers is sticking a bit. Will look at this and see if pushing it in and giving it a bit of grease helps it out.

Regards
Paul

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Best Brake fluid and how much do I need?

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