Guys,

I have a 1971 dato ute, so being an"older model" it has the single brake master cylinder as standard. I have had the front strut / disk brake conversion done and an A15 put in, but the the single brake master cylinder has been reconnected.

It appears the popular change over is the 180B dual cylinder. If it is cheap and easy why not. Forgetting about boosters, how much of a difference does this actually make to stopping power over the single? Do I need to bother at all?? I suppose being a ute there is less weigt to stop so it might not be as important as in a sedan?

cheers,

daz

You need the right dual master cylinder real quick.
The drum brakes on the rear should have a small amount of hydraulic pressure in the line all the time. This is achieved by the "residual pressure check valve" in the master cylinder.
This is needed to ensure that the lip od the cups are always sealed against the bore of the wheel cylinder.

Meanwhile, the disc brakes require NO pressure when the brakes are released. If there is any pressure in the line the pads will drag a little, & that can't be good.

The dual circuit master cylinder provides both of these functions.
What front brakes are you using? If they are the 1200 coupe ones, then get the plumbing from a dual circuit 1200 & go buy yourself a 1200 coupe cylinder. New ones are not all that expensive, but are good value.

It would be a good idea to replace the rear wheel cylinders with the right ones for a disc brake model as well, or you will find a tendancy for the rears to lock up when you don't need them to. The factory changed the rear cylinders in coupes [with discs] for a very good reason.
New ones of these are somewhere between $15 & $20 each,.... new, so there is really no reason to not do it.

I am using a Stanza disk brake set up on the front. Standard drums on the back. If I go the 180B cylinder I take it I will need to get the plumbing (lines) from the 180B as well.

cheers,

Daz