Replacing fluid, is 500ml enough?

Technical Area Wheels, Tyres & Brakes
1
  1. My model of MX-5 is: NC
  2. I’m based near: Bristol

Hi all

I bleed my brakes annually and usually get one litre as it’s not expensive.

However, this time around im upgrading to some high boiling point PBS fluid and I ordered 500ml for £18.

I’m going to change all the brake fluid that I can by doing the following:

Clamping the line on each corner and retracting the caliper piston via the bleed nipple.

Emptying the brake fluid reservoir with a turkey baster.

Refilling the reservoir using a Gunson Ezibleed, then bleeding the brake calipers and the clutch.

Topping up the fluid after a test drive.

Will 500ml be enough for this?

Thanks

2

I think you already know the answer, but if it helps, no. Sorry.
:heart:

1 Like
3

In answer to your question, you may find this topic useful/helpful:

But no, 500ml won’t be enough. Also, £18 for 500ml of whatever you’ve ordered also sounds v.expensive when something well regarded like Motul’s RBF 600 fluid is around £11 for a 500ml bottle.
(e.g. Motul RBF 600 Factory Line Fully Synthetic DOT 4 Racing Brake & Clutch Fluid)

1 Like
4

Thanks guys, so it’s too little as I suspected.

I’ve been waiting on PBS Track pads for the rear to come back in stock, nobody had them, and when I saw them in stock on the PBS website I hastily ordered them.

At checkout I was offered some PBS 600 brake fluid, I think it was £13 for Track fluid and £18 for Race fluid (both 500ml).

Having had the kind people on this forum recommend dot4 600 fluid, I went for the fancy race stuff without thinking of the quantity.

Oh well, I might ask them nicely if they could do me another 500ml without charging delivery.

Edit: The fluid I’ve bought is 660.

5

I find that if you syringe from the reservoir first, refill with fresh fluid and give 10 pedal pumps per corner, 500ml is enough.

2 Likes
6

Thanks Robbie. I probably tend to over bleed more than necessary as the colour looks the same to me.

Also, using the pressure bleeder makes it harder to monitor.

It would be great if we had data for exactly how much fluid is in each line. I could then bleed out a precise amount into a measuring jug with a small buffer zone.