750gixer0
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Registered: 05-2005
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Re: Brake Master Cylinder Piston Size Please
Sorted! The 73 master cylinder is identical to the 750SRAD! Maybe worth remembering this one for future reference furry!!
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9/6/2005, 19:56
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gixersteve400
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Registered: 04-2005
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Re: Brake Master Cylinder Piston Size Please
so why do some people do an upgrade to the 750 srad master cylinder if its exactly the same size piston in the master cylinder i dont get it??? ive heard many people say the 750 srad master cylinder dramatically improves the brakes on the gk73a but what would actually make them better then if its not the piston size ??? this is confusing lol anyone ?
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9/6/2005, 22:42
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750gixer0
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Re: Brake Master Cylinder Piston Size Please
Now you're confusing me! Wonder if there's more travel? The one thing that stuck in my mind was why do the japanese use imperial sizing? I would have thought that they would have used metric! ie. 15mm instead of 5/8". Think you've started one here matey!!!
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10/6/2005, 6:59
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furry
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Registered: 01-2004
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Re: Brake Master Cylinder Piston Size Please
Well on my 71f...putting the 750 SRAD Master Cylinder on it...has increased the breaking by at least 3 times...front stoppies are us
It's def 5/8 on the 750 SRAD...not sure about on the 400 though...as I said on mine at least was diffcult to see the actual size!
According to the gsxr400 manual...
(Gk71f)
Master Cylinder bore = 14.000 - 14.043
Master Cylinder Piston diam = 13.957 - 13.984
An inch = 25.4mm
25.4 x (5/8) = 15.875mm
So the SRAD 750 offers a bigger bore size!
--- www.gsxr400.com
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10/6/2005, 12:01
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gixersteve400
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Re: Brake Master Cylinder Piston Size Please
im understanding now but the gk73a comes with the 5/8 as standard so i presume the 750 SRAD upgrade wouldnt really make any difference.
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12/6/2005, 22:21
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furry
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Re: Brake Master Cylinder Piston Size Please
In theory you would be correct...but I sold anonther gsxr750 SRAD to a friend with a GK76a...he reckons it made a huge difference...
Only thing I can put this down to is maybe his origional master cylinder was not very good???
It's made a big difference on mine though, but bore size ratio it 2mm bigger!
I think if the gk73a is showing 5/8...then rather than swapping it with an SRAD one...it might be a better idea to buy a master cylinder piston rebuild kit...they don't cost much and could make a world of difference to your breaking!
--- www.gsxr400.com
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13/6/2005, 15:43
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gixersteve400
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Re: Brake Master Cylinder Piston Size Please
yea thats a fair point furry, if both master cylinders are 5/8 then the only thig affecting it really would be age/ wear n tear therefore a rebuild kit could be just as effective as buying one off a SRAD
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13/6/2005, 21:48
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