ScoobyWeb

I am going to change my brake lines for the goodridge Stainless steel jobbies, I will also be changing the fluid to DOT 5.1. My question is do I have to flush out the old fluid with the new fluid and if so whats the best way of doing this and how much fluid would I need to do it. Car is MY06 STI.



Cheers, Chris.

jasonius

iTrader: (1)

The best way is to draw off as much of the old fluid in the reservoir as possible (a biggish syringe with a piece of thin flexi pipe is ideal). The more you can remove the better. Then fill it up with fresh fluid, then bleed each caliper in sequence, keeping an eye on the fluid level in res. as you don't want to draw any air into master cylinder/ABS system..!

There's only two ways to bleed the brakes a subaru (due to the res. cap design), either using a vacuum kit (that sucks the fluid out, as per main dealer etc) or the old fashioned way of pumping the pedal manually, 'two man method'. Either way, bleed each corner into a jar (keeping end of hose immersed in fluid throughout, until fresh fluid can be seen (new stuff will be much lighter than old stuff).

This is the correct sequence:

1) Front right
(2) Rear left
(3) Front left
(4) Rear right

With regards to changing the hoses, try to minimise fluid loss as much as possible and keep reservoir topped up throughout, as above..

Try a quick search for further info..

Phildodd06

I have just done mine, i drained the old fluid out and thn changed the break lines, gotta put the new fluid in still, but will have to bleed it till the new fluid comes through. quite an easy job TBH

ScoobyWeb

Cheers for the info Guy's. Roughly how much fluid do you think I need to buy. 1 litre, 2 litres, more, less.


Cheers, Chris.

Normski

1 litre should be enough. Have a clear tube connected to the bleed screw so you can see when the new fluid is coming through. The new fluid will be less dark, brake fluid tends to darken with age.

Mother Theresa

Buy 2 x 500ml as you can do it in under 500ml if careful. IF USING THE BRAKE PEDAL TO PUMP OUT THE FLUID THEN DO NOT DEPRESS THE PEDAL FULLY EACH TIME - otherwise you can knacker the seals and a minor job becomes a real nause.

Phildodd06

I used 1 litre.

What seals can knacker?

Mother Theresa

The ones in the master cylinder.