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Author: Subject: Looking to upgrade sierra master cylinder
jps

posted on 9/10/17 at 11:23 AM Reply With Quote
Sierra res can be reused, Voucht on the Haynes forum (am here?) did a template for an alu mount to hold it in the right orientation for a 7 installation (in the Sierra the m/c fits the bulkhead in such a way as it was angled upwards - so the mount compensatates for this.

I got a Mk1 cylinder as NOS from eBay a few years ago - good to see part numbers to show they are available as NNS though!

[Edited on 9/10/17 by jps]

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martinnitram

posted on 9/10/17 at 10:07 PM Reply With Quote
Nice work, as you know I'm doing the same job, sierra to Fiat master cylinder, not had mine out on the road yet as have a few other jobs on going.

I ended up with a reservoir from kitspares who are not far from me, came with a nice alloy bracket which saved time with mounting.

Don't know about you but the bottom of the ports is a bit rough and took a real good tighten to get the pipe unions to seat in without leaking, worse one is the 2nd front brake port which I screwed a bleed nipple in to blank it off, ( you ran 2 separate lines ) its a stainless nipple so quite hard against the rough inside of the port and didn't want to seal at first.

Pedal feels better though.

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CosKev3

posted on 10/10/17 at 06:51 AM Reply With Quote
quote:
Originally posted by martinnitram
Nice work, as you know I'm doing the same job, sierra to Fiat master cylinder, not had mine out on the road yet as have a few other jobs on going.

I ended up with a reservoir from kitspares who are not far from me, came with a nice alloy bracket which saved time with mounting.

Don't know about you but the bottom of the ports is a bit rough and took a real good tighten to get the pipe unions to seat in without leaking, worse one is the 2nd front brake port which I screwed a bleed nipple in to blank it off, ( you ran 2 separate lines ) its a stainless nipple so quite hard against the rough inside of the port and didn't want to seal at first.

Pedal feels better though.


I wouldn't mind betting the bleed nipple has the wrong shaped seat to fit correctly?

If you look at a brake pipe fitting flared end it is nowhere near the same shape as a bleed nipple!

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flanders

posted on 10/10/17 at 08:18 AM Reply With Quote
yeah i didn't have any issues with leaks bud. I pressure tested the system for 3 hours before filling with fluid.

Im going to re-bleed the system tonight, I think I may still have air trapped somewhere (probably rear calipers or in the cylinder) and im going to adjust the pedal so that there is a tiny bit of play between the push rod and the cylinder

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martinnitram

posted on 14/10/17 at 08:59 PM Reply With Quote
quote:
Originally posted by CosKev3
quote:
Originally posted by martinnitram
Nice work, as you know I'm doing the same job, sierra to Fiat master cylinder, not had mine out on the road yet as have a few other jobs on going.

I ended up with a reservoir from kitspares who are not far from me, came with a nice alloy bracket which saved time with mounting.

Don't know about you but the bottom of the ports is a bit rough and took a real good tighten to get the pipe unions to seat in without leaking, worse one is the 2nd front brake port which I screwed a bleed nipple in to blank it off, ( you ran 2 separate lines ) its a stainless nipple so quite hard against the rough inside of the port and didn't want to seal at first.

Pedal feels better though.


I wouldn't mind betting the bleed nipple has the wrong shaped seat to fit correctly?

If you look at a brake pipe fitting flared end it is nowhere near the same shape as a bleed nipple!


Ive now swapped the bleed nipple for a brass bung, and yes there is a noticeable difference in the shape.

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