Hello All,

I'm recommisioning my Fiesta Mk.3.5-based kit car and have run into a problem with the brake servo.
I've changed the original servo and master for XR3i parts. Th eold master was leaking and the servo is well aged.
A firend with a lathe has made a special pedal pushrod. I wasn't keen of having a plastic bush taking pedal pressure
and I wanted adjustability.



Now everything is assembled, I have brakes but they're a long way down.

In the Fiesta servo, the centre pin sits level with the face of the servo can.



I got one of those H-shaped tools but it doesn't fit the XR3i master.

So, how can I measure the desired preload. Thank you.

 

Never had an issue using the brake rod depth tools. Assume your issue is the H sits against the outer face rather than the inner O where it has that step? In which case use the tool on the outer face, measure using an engineers rule the depth of the step and then account for the difference.

That or eye ball it. Fitting the MC, you'll feel pressure if the rod is fouling. Takes a few tries, but you'll eventually get it within a decent tolerance.

 

Or 3rd option given your mate can clearly fabricate. Get him to whip up a smaller H tool

 

Thank you haz87.

The problem with the H-tool is with the master cylinder, not with the servo can.
I've come up with a cunning plan though. I've made up four braided stainless flexy pipes to connect the four hard brake pipes to the master.
This means that once everything is rigged and bled, I can unbolt the

S/S FLEXY SPIGOT
master and play with the centre pin as much as I like.

There's a square section O ring on the end of the master, which I expect is to prevent an air leak. So, if I set the pin so there's a tiny gap before the nuts are nipped up, I should be in the right parish. Obviously, if the brakes bind, I can just screw the pin in a touch.