Quote:
Originally Posted by rapidtornado
can you remember where you got it from Andy? I need the same set-up as noted above (3 port) and I'm looking at £80+ for an m/c (all round discs) so will be getting that unless you can direct me to the 30 quid supplier 
Cheers |
All round disks on the sierra uses a 25MM Master Cylinder ( 3 port ) and you will be lucky to get one cheap.
You can probably use the standard disk/drum cylinder ( still 3 port ).
The reason for the bigger master cylinder is to produce more fluid in order to supply the calipers at the rear. Now, people that have upgraded to rear disks on the sierra have reported variably that it makes little difference to the pedal travel, or that there is some increased travel but it still works.
If you think about the above "Pedal travel" that "extra" can be dialled out by moveing the operating rod further from the pivot point ( so increasing travel ) This was not realy an option on the sierra as it would have required some reworking of the pedal assembly , so the cheaper option of a larger cylinder was used.
TT