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Difference between black and yellow band brake master cylinders


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#1 Jammy

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Posted 25 May 2007 - 10:40 AM

Just been talking to Simon @ Minispares and this has come directly from AP:

Firstly, they enlarged the bore on one of the ports to stop people getting front/back mixed up. This is the reason why you need conversion pipes when going from the black band master to the yellow band.

The other reason is that there was a problem with air getting into the black band masters. This was down to the plain bore which they changed to a stepped bore in the yellow band master.

And thats it! :withstupid:

#2 camp freddy

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Posted 07 September 2007 - 10:40 PM

Just been talking to Simon @ Minispares and this has come directly from AP:

Firstly, they enlarged the bore on one of the ports to stop people getting front/back mixed up. This is the reason why you need conversion pipes when going from the black band master to the yellow band.

The other reason is that there was a problem with air getting into the black band masters. This was down to the plain bore which they changed to a stepped bore in the yellow band master.

And thats it! =]


I have a split f/r cylinder, ther are two types of brake line sets aswell, one has all metric fittings ( which I ordered)
and the other has unf on the m/cylinder and compensator and metric everywhere else (which my car has)
so Ihad to get the unions changed !! I think Moss list both types of brake pipe sets.

#3 Ethel

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Posted 07 September 2007 - 11:54 PM

Just been talking to Simon @ Minispares and this has come directly from AP:

Firstly, they enlarged the bore on one of the ports to stop people getting front/back mixed up. This is the reason why you need conversion pipes when going from the black band master to the yellow band.

The other reason is that there was a problem with air getting into the black band masters. This was down to the plain bore which they changed to a stepped bore in the yellow band master.

And thats it! =]


I have a split f/r cylinder, ther are two types of brake line sets aswell, one has all metric fittings ( which I ordered)
and the other has unf on the m/cylinder and compensator and metric everywhere else (which my car has)
so Ihad to get the unions changed !! I think Moss list both types of brake pipe sets.


I think the step is just there to increase the the pressure applied to front brakes without increasing the pedal travel more than needed

#4 clubman katie B.F

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Posted 26 April 2008 - 05:23 PM

Just been though this malarkay myself, and after going through several metric fittings whilst making my own brake pipes i can confirm that the larger metric union is 12mm




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