changing pads/rotors/lines: brake fluid question

[anthonyrb98]

looking to swap my stock rotors/pads/lines for some rotora ones. how much brake fluid do i need to complete the swap? as in how many bottles of motul etc.? also, any other brake fluid brands to recommend? thanks!

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[LyveWRX]

I like Mobil Synthetic better than Motul. only cause after 5.5 mths of motul the fluid looked way worse (darker) than 2000mi looks on motoroil.

[DrD]

you can probably do the swap with two containers (maybe even one if you are really efficient) - I would go with two or three (I usually buy one of the large bottles, then have plenty left over when I am done - I figure better safe than sorry). Unless you track the car, I wouldn't bother with the Motul (assuming you mean the rbf600 dot 5.1 stuff) - the higher performance (in terms of boiling point) fluids tend to take on water more quickly. A good dot 4 (valvoline synpower or Castrol GT-LMA for example) is a good choice, and much cheaper. (also - don't get sucked into the "but this one says it's synthetic so it must be better" trap - they are all 100% synthetic fluids)

[subieworx]

ATE Super blue is also a pretty good fluid that is not too expensive. I would use that for your setup rather than the Motul. You won't build enough heat to boil the Superblue.

[cboggess]

Unless you have porterfield R4-S pads on an STi then you'll boil superblue quite nicely.

Superblue is just fine, and i comes in quart containers. If I remember correctly it took us 1.5 cans of superblue to replace. Motul comes in smaller containers, and I think took 2.5 containers to flush.

[VoltesV]

Originally Posted by anthonyrb98

looking to swap my stock rotors/pads/lines for some rotora ones. how much brake fluid do i need to complete the swap? as in how many bottles of motul etc.? also, any other brake fluid brands to recommend? thanks!

I was actually thinking of doing the same thing for my break upgrade plus calipers. However I'm a little short on cash. I'm currently running Cobb Stage II 93 octane, do you guys think that this set-up, less calipers, will be good enough for my current power mods? Any suggestions will be appreciated.

[Charge]

Originally Posted by VoltesV

I was actually thinking of doing the same thing for my break upgrade plus calipers. However I'm a little short on cash. I'm currently running Cobb Stage II 93 octane, do you guys think that this set-up, less calipers, will be good enough for my current power mods? Any suggestions will be appreciated.

It certainly would be fine. The stock braking system is fine. Lines can help feel a little, but are really just a safety feature for tracking the car. Stock rotors are fine unless you are doing track days where heat dissipation may become an issue, or if you choose pads that are a little too aggressive for the stock rotors. Pads, well, it depends on what you want to do. Stock replacement style, aggressive street, street/auto-x, auto-x, or track(some pads are able to handle some light track duty and perform on the street, but will probably not have much durability for more than one or two track days at best).

Upgrading the calipers normally doesn't increase brake performance significantly...that's more in the pads. The upgraded calipers usually allow a larger rotor, for better heat dissipation and often have more pistons(pots) which allow a more even application of the pad on the rotor...which also helps reduce heat.

So it depends on what you're doing.