Stock brake system capacity Options

[-JR-]

Anyone have any clue, idea, guestimate of how much fluid a stock 914/4 brake system holds?

I'm putting in DOT5 fluid on my next brake flush this week and want to make sure I have enough. It's pretty pricey stuff, so I don't want to go overboard.

I've got 700mL now... Hoping that's enough.

Thanks!

[-JR-]

Well took 3 hours and 1.5 liters of alcohol to flush and another hour of bleeding, but it's all done now.

My best guess on the amount of fluid a stock 914 brake system can hold is 500mL. So if you are using brake fluid to flush out old brake fluid, you will certainly want at least a liter. Maybe more if you are flushing a system that hasn't been done in a while.

I used all 700mL of brake fluid because I ran extra fluid out to search for more air bubbles in the lines.

I've run DOT5 in other cars that were even older and never had an issue. The only thing I will say is that DOT5 seems to be a little softer pedal, on the whole, than DOT3 or 4. I suspect it's because of the silicon based formula lubricating the surfaces better, but I've never done any in depth research.