With my upcoming trackday on Monday and the Trophy over 3 years old I thought it'd be a good idea to replace the brake fluid with some Motul RBF 600. Okay so I got the car jacked up and the front wheels removed and 4 bottles of 500ml. I know a lot of people empty the reservoir of old fluid but I just flush the lot through taking a little longer. Unfortunately it started hammering it down as I began and my patience soon thinned so I only managed one bottle between the two rears first and then a bottle per each side on the front. My concern is that the rears still have old fluid in them due to the lack of flush ( 250ml extracted each side ). This going to cause me concern and can lower spec old fluid be mixed with higher spec new stuff?
There isn't a problem mixing it if both spec fluids were new you'd just go by the lower boiling point. But since youve mixed it with old fluid you might contaminate the new stuff because it will have absorbed water over time making your fluid change useless unless you get it all flushed properly.
So I have to get a load more fluid and flush the lot again? As I'm out of Motul and only have Halfords racing fluid readily available.
Not the whole lot just the stuff you didn't manage to get out. It will only contaminate the stuff in the line.
Sorted, got another bottle and flushed an extra 250ml out of each side, so that's 500ml out of each caliper should be more than enough
How much do we think is in the system? I plan on changing my lines this week and need to acquire some fluid from works stores.....
Re bled them with the halfords racing brake fluid ( 2 litres for for £20 on trade and dry boiling point of 305! ) Good day so far but it's practically a monsoon out there, the diff is a godsend!
