ryanill
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| posted on 19/2/20 at 12:24 PM |
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Number of Sierra brake master cylinder ports
Hi all
At current I have a Sierra master cylinder with a pitted bore causing a leak. Options are to replace it get it sleeved.
A new on is seeming to be the cheaper option but all the new ones I can fine all have 4 ports on them, one to each calliper I assume. My current
master cylinder has 3 ports and has one line to the rear of the splits at a T before the callipers and 2 lines running to each front calliper.
I’m hesitant on using a 4 port master cylinder as I’m not sure if blanking one of the rear ports would have detrimental effects of the braking of the
rear callipers ?
If any one could shed some light of the subject it would be greatly appreciated
Ryan
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nick205
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| posted on 19/2/20 at 12:43 PM |
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The Sierra master cylinder I re-used from my donor car had 3 ports.
2 (1 to each front caliper)
1 (split with a T to the rear drums)
Worked just fine.
Not sure what a 4 port master cylinder would be for - Sierra Cosworth perhaps?
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ryanill
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| posted on 19/2/20 at 01:05 PM |
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Hi nick
Yes I have had the 3 port cylinder on the car since day one, and never had any problem . Now it’s pitted and needs replacing or repairing . But the
only new ones I can find are the 4 port type. Just not quite sure how/why they are different or if they are compatible at all.
Or if any one knows where new 3 port ones are available from ?
Ryan
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JonBowden
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| posted on 19/2/20 at 01:16 PM |
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Ryan,
This one claims to have 3 ports:
https://www.kitspares.co.uk/index.php?route=product/product&path=43_9&product_id=80&car=43
Jon
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rusty nuts
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| posted on 19/2/20 at 06:12 PM |
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Some master cylinders actually came with a blanking plug for any unused ports so blocking one off wouldn’t cause any problems
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JAG
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| posted on 19/2/20 at 08:13 PM |
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I'd simply blank off the spare port.
It won't cause any problems 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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ryanill
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| posted on 19/2/20 at 08:14 PM |
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Cheers Jon. I did see that one but obviously I didn’t read the description, just looked at the pictures. Oops.
And thanks for the confirmation rusty.
Cheers for the help and quick responses folks
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