How do you pipe these up?
I've laid out my pipe run as per the book with a four way union at the front and a three way at the rear axle. One pipe goes from the master cylinder to the four way then from the four way to the front calipers then also from the four way to the back axle to the three way then to the rear wheel cylinders. But there is another tapping in the master cylinder. What's this for? Can I blank it off or is it for the rear brakes in which case I've got it all completely wrong and I'll need to start again?
As you can tell I know sod all about automotive braking systems!!
Cheers
Jon

This should help.
You could put the switch in the 4 way.
Clive

[Edited on 11/7/05 by Snuggs]

If you have a single Sierra master cylinder then there should be 3 connections. one goes to the rear and is split to either side by a T piece.
generally people use the other 2 as one each of the 2 front calipers.

HTH

Sounds like you have a master cylinder for a split braking system which is good for good for safety!

And you have designed your pipework for a simple single system.

The sierra master cylinder I used has 2 outlets for the front brakes and a third outlet for the rear brakes!

I wouldn't think that blocking one hole in M/C would be a good idea. If you want to retain your M/C then find out how it was plumbed in the car it came from and replicate that.

HTH

Mark

Jon,
If your mcyl is the old Girling cast iron type (p/n 74066315 stamped on the black plastic id band), there will be 2 outlets at the "front" end, and one outlet from the rear chamber.

The 2 outlets should be connected one each to the front calipers. No need for any 3-way, unless you have to fit that pressure switch.

Feed the single outlet from the rear chamber to the rear brakes, via the 3-way.

Happy plumbing!!

As per Dick A above but if using sierra stuff then any proportioning valve (or in this case more of a restrictor/ pressure reducer) should go in the rear common line unlike the pic from Snuggs. Highly unlikely the fronts are overbraked, nearly always the rears.

Thanks for all your help. Looks like I'll have to start again!
Cheers
Jon

If you've got Cortina front brakes and Escort rears you shouldn't need a proportioning or reduction valve with a Sierra master cylinder.