My 1990 300 ZX twin turbo has a lot of kms so rather than put an overhaul kit through my brake master cylinder I was wondering whether I could source a replacement that has a larger bore size and therefore larger volume. Possibly a later version 300ZX, GTR or other compatible vehicle? Any experience or suggestions greatly appreciated
The ABS BM57 in most z32's is one of the biggest m'cyl's Nissan used, and is a common upgrade for a lot of other Nissans of the same era. To go bigger you would have to go aftermarket.
I went with the series 6 (2kspec) BMC for my brake upgrade. It has a larger capacity reservoir compared to the original BMC from what I read which i think Nissan claimed provided better pedal feel when stopping. Comparisons More information here http://www.aus300zx.com/forum/garage_modification.php?do=view_mod&id=2121
The 'improved' pedal feel is actually because they're smaller. That draws to the point, what to do you (more directed to the op) think constitutes an 'upgrade' for the master cyl? You'll only need a bigger one if you go large six or eight pot front calipers with a corresponding rear, otherwise it will just reduce pedal sensitivity.
I just put new stock rotors and Bendix GCT pads and performs pretty well in my eyes but I am just street driving it. In latter models like Adams Y2K BMC they did reduce the size to improve every day feel. I think as a refined vehicle it would probably be better.
Hi Fists, yes, have done the big brake upgrade, K-Sport rotrors with 8-pot calipers front and 6-pot rear, so just covering all bases.
There is no bigger master cylinder that you can straight bolt on. I have looked into it quite a lot and am very interested if you find something.
From the Willwood website: Master Cylinder Q: What master cylinder bore size do I need? A: The master cylinder bore size that you need is dependent on several variables. Choosing a master cylinder bore size begins with defining how the master cylinder will be actuated, manually or with the assistance of a booster, either hydraulic or vacuum operated. Once you have decided on how the master cylinder will be actuated, the information below can be used as a guideline for selecting the right master cylinder. Keep in mind that auto manufacturers have put many years of experience and a lot of testing into determining the right combination for a given car. When building a custom car with changes to the suspension, brakes, tires, and weight balance; you too may need to do some testing to determine which master cylinder is right for your vehicle. The combined piston area and piston volume of your calipers and the pedal ratio, are two of the primary considerations. Whether the system is boosted or not is another consideration. Remember that a larger master cylinder bore produces more volume and a smaller master cylinder bore produces more pressure. To determine the appropriate master cylinder bore for your specific application, review Wilwood's Tech Tip Guide. You can also contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.
