Brake Fluid Replacement - Abs - High Temp Fluid

[MrStabby]

I want to do a complete replacement of my brake fluid but i have some questions for the experts;

1. Do i just pump it all through with the pedal after replacing the fluid in the resevoir?

2. How will i know when all the old stuff is out (and how much will i need for R32 GTR)?

3. Does the ABS unit need any attention?

4. Is it ok to use high temperature fluid (Motul 600) in a car that does the occasional track day but is mostly street driven?

Cheers,

Kot

[blind_elk]

What I've been told:

I want to do a complete replacement of my brake fluid but i have some questions for the experts;

1. Do i just pump it all through with the pedal after replacing the fluid in the resevoir?

DO NOT pump it through. Jack the car up on all four corners. Simply open the bleed nipples and let the fluid drain under gravity

2. How will i know when all the old stuff is out (and how much will i need for R32 GTR)?

When the fluid stops flowing, top up the reservoir, and let the new fluid flow through under gravity. Helps if you use different coloured fluid, otherwise you have to basically guess. Close off all the nipples, then do the normal brake bleed method.

3. Does the ABS unit need any attention?

Nothing out of the ordinary.

4. Is it ok to use high temperature fluid (Motul 600) in a car that does the occasional track day but is mostly street driven?

The temperature resistance of the brake fluid can't be too high, ie high temp fluid is better than lesser temp fluid.

[Kinks]

If you simply pump the pedal you will suck air back in as you release it.

The only way to pump fluid through is in this sequence:

1) open bleed nipple

2) push pedal 2/3 of the way to the floor (NOT all the way you can root your master cylinder seals if you do)

3) hold pedal at that point

4) close bleed nipple

5) release pedal

repeat. obviously you need 1 person working the pedal and 1 person opening and closing the bleed nipple.

a simple gravity bleed is much simpler you just jack the car up evenly, whack a bleed hose on and open the nipple, then wait until you see new brake fluid (you'd want it to be different colour to the old stuff).

start from the corner furthest away from the master cylinder (ie the rear left) then the next closest (rear right) then left front then right front last.

I would always do a gravity bleed unless there was a reason why that didn't work, or i was in a hurry and had extra help available.

Edited September 17, 2006 by Kinks