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Author: Subject: Number of Sierra brake master cylinder ports
ryanill

posted on 19/2/20 at 12:24 PM Reply With Quote
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.

Iím hesitant on using a 4 port master cylinder as Iím 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

posted on 19/2/20 at 12:43 PM Reply With Quote
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

posted on 19/2/20 at 01:05 PM Reply With Quote
Hi nick

Yes I have had the 3 port cylinder on the car since day one, and never had any problem . Now itís 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

posted on 19/2/20 at 01:16 PM Reply With Quote
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

posted on 19/2/20 at 06:12 PM Reply With Quote
Some master cylinders actually came with a blanking plug for any unused ports so blocking one off wouldnít cause any problems
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JAG

posted on 19/2/20 at 08:13 PM Reply With Quote
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

posted on 19/2/20 at 08:14 PM Reply With Quote
Cheers Jon. I did see that one but obviously I didnít 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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