Wrong brake rotors? 9 3/16 front and 9 1/16 rear. 1.8? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-07-2011, 02:11 AM   #1
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Default Wrong brake rotors? 9 3/16 front and 9 1/16 rear. 1.8?

Ok so I bought what I thought where 1. 8 brakes as a kit from the guy I bought the car from.
Was planning on installing with diff sunday.
Well one rear driver side caliper and bracket are gone.
I got a use one from junk yard.

It is too big for the rotor.

The fronts are 9 3/16 diameter
Rear are 9 1/16 diameter

Are these the brig brakes from the 1.8 not the sports but the normal bigger brakes that still fit with 14inch rims.
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Old 10-07-2011, 09:22 AM   #2
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sounds like typical non-sport size
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Old 10-07-2011, 11:14 AM   #3
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Ok so these are the bigger 1.8 brakes?

What year should I ask for at the junk yard to get the right bracket?

What size are the 1.6 brakes?

Thanks
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Old 10-07-2011, 11:18 AM   #4
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No, the bigger sport rotors at 11"

actually you migh tjust have stock 1.6L brakes.

Without remember the exact sizes offhand. The 1.6L started with 9" rotors, then went to 10" on the 1.8L and finally 11" on the sports.
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Old 10-07-2011, 01:03 PM   #5
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Thats what I am worried about. They look about the same as the one that are on it now.
I am going to run to the auto parts store and check.
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Old 10-07-2011, 01:25 PM   #6
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Well I paid 300 dollar for 1.6 brakes. Wow my a** hurts.
I cant believe that guy sold me 1.6 brakes they where supposed to be the upgraded 1.8 brakes

WOW
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Old 10-07-2011, 02:40 PM   #7
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go punch him.
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Old 10-07-2011, 10:31 PM   #8
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Just measured my old 1.6 rotors, they are about bang on with OP's measurements. I would have to remove wheels to measure the 1.8 rotors, but they are 1" bigger dia basically.
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Old 10-08-2011, 12:09 PM   #9
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Thanks for taking the time to measure.
I guess its setteled they are 1.6 brakes.

Well I called the guy who sold me the part (and the car) and he was really cool about the whole thing.
He said he bought the brakes and was told they where 1.8 but he never checked.

He is going to return my money no prob.
He was so nice I figured if the rear end was a posi it was worth 100 dollars so I said I would test it.
How do i tell if the rear end is posi?
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Old 10-08-2011, 12:21 PM   #10
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Quote:
Originally Posted by 90 Turbo View Post
How do i tell if the rear end is posi?
http://lmgtfy.com/?q=how+to+tell+if+rear+end+is+posi
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Old 10-12-2011, 03:43 PM   #11
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Thanks for the responce. Vast. I know how to tell when driving a car if it is limited slip. I needed to know how to tell on a loose diff for a miata.
Isnt there a # I can call mazda at with the vin and they will tell me?
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Old 10-12-2011, 03:57 PM   #12
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if you have a 90, it's pretty much an open diff unless upgraded
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