Anyone know how much fluid I need to flush the brake and power steering systems on a 98 LS400.

 

Don't do it, it's needless.

And. Asking this question shows a level of inexperience indicating your haven't done this before, don't mess with your brakes without expert help, please.

 

Yes there is a need to flush the fluids, and have no fear in flushing your brake fluid. It should be flushed at proper intervals. Flush until clean fluid comes out and some more. Prevent air from entering the system by not letting the fluid level in the reservior gets too low. Use suitable bleeding method and it is hard to go wrong.
Flushing power steering is a bit tricker, and if not done properly can yield undesirable results. Make sure to clean the filter screens while you're at it.
If I remember correctly, it took me about a quart of brake fluid and 3 quarts of Mercon to flush the brake & power steering system respectively.

 

Thanks for the info.... as far as my inexperience...the power steering fluid is being flushed by Lexus Technicians with 10 years experience. As for the brakes I have the factory service manual...I think I will be alright. As far as fluids not needing to be changed. That is BS. Over time with use fluids break down (no exceptions)..some quicker than others. I have never seen any good come from neglecting service. If you can show me some defintive data as to the contrary I would love to see it.

 

Japanimal,

About 3 weeks ago I changed the front pads on my '97 LS400, and during the bleeding process I ran three (smaller) bottles of Castrol LMA brake fluid through the system. That was enough to get all the trapped air and old fluid out of the front braking system.

I am replacing the rear pads this weekend, and I will probably run 2-3 bottles through there as well to fully bleed and flush the system.

Regards,

 

I changed the rear brake pads over the weekend and ran a large bottle of castrol LMA through the system during the bleeding process. I've now got fresh fluid in both the front and rear brake systems...

 

How much fluid is required for a brake fluid flush, in liters?

 

2 quarts usually does the trick, so, a little more than 2 liters... might not be a bad idea to go ahead and go with 3 just to have some extra...

this also depends on how much new fluid you want to push through the system to flush it out...