brake fluid flush, how much replacement fluid?

[2001ultima]

I'm going to flush the brake fluid. Does anyone recall how much fluid I need to flush the lines?

Also, I'm going to try Prospeed RS683 Brake Fluid

https://www.pegasusautoracing.com/group.asp?GroupI...

[Steve_D]

I'm expecting your system would have had dot5.1 in from new so you should be looking to use that spec.

Steve

[F.C.]

Dot 4 and 5.1 can be mixed or used in the same system but ought not to be it would make sense to use the same fluid already in the system,
Try and use the same brand also, not all fluids of the same rating are created equally.
Just in case you were thinking dot 5 might be an alternative, it isn't it is silicone based and should never be mixed.

[Pb3]

I did mine recently after changing my master cylinders. I used approaching a litre, but after having to rebleed the old fashioned way a bit more was required. There is no such thing as an easy-bleed if you know what I mean

You may get away with less, but I probably always flush more through than absolutely necessary (just for good measure).

[macgtech]

Pb3 said:

I did mine recently after changing my master cylinders. I used approaching a litre, but after having to rebleed the old fashioned way a bit more was required. There is no such thing as an easy-bleed if you know what I mean

You may get away with less, but I probably always flush more through than absolutely necessary (just for good measure).

Agree with the above.

I would also state that in essence, for a performance car, the DOT rating's really are not terribly helpful. You should get a fluid with a high boiling point (wet and dry) - typically the AP PRF 600 or Motul RBF600 fluids have a dry boiling point of around 600 deg F, and a wet boiling point significantly lower than this, normally around 300-400 deg F. (its classed as 'wet' since it has absorbed moisture as brake fluid is hygroscopic). The website quoted above has some very useful information on.

We have used Motul RBF600 fluid on all our race cars and have never had an issue with a soft pedal (caused by overheating fluid). This should not be mistaken for brake fade due to overheating pads!

[2001ultima]

Ok, good information thank you. I'll buy a little over a liter. I'll try the Motul RBF 660

[macgtech]

2001ultima said:

Ok, good information thank you. I'll buy a little over a liter. I'll try the Motul RBF 660

Good choice! Bear in mind it comes in 500ml bottles rather than the normal 1l! Opie Oils are normally cheapest