smnc

Okay, now I thought all non-SE 1st gens had the same front brakes, but I was looking into replacing the rotors on my '85 S model, and I found two different part numbers. One for 79-83, and one for 84-85's.

What the difference?

I found some rotors for cheap on e-Bay but they're for 79-83. I want to know if they fit.

Thanks.

jeremy

iTrader: (1)

the 79-80, 81-83, 84-85 calipers are different. not sure on rotors. i "thought" the 79-80 were different then the 81-85 due to the different hubs.

Maguire

iTrader: (1)

the 81-83 front rotors are different than the 84-85. its got something to do with the spindels. not sure on the details though. but yeah, they wont fit.

specRX7_22

yes maguire is right. the early cars (81-83) have smaller spindle diameter, therefore making the bearings and everything different.

smnc

Thanks guys...
The '85 S model is actually my g/f's...

My car is an SE, so that's my area of expertise.


Now I know...

S2-13BT

If it's anything like the Oz cars (which it never is ) the later cars have vented and slightly bigger discs on the front while the older cars are solid.

That'll be where your different part numbers come into it.

680RWHP12A

the rotor brgs are bigger on the 84-85 models!

81Rex6port13b

when did they change to studs? my car has the lug bolts.

Maguire

iTrader: (1)

the -se's were studs. and i think the aussie cars were studs? So i guess, anything with a 4x4.5" pcd.

djmickyg

yep we got the stupd studs (mazda trying to be europian)

Maguire

iTrader: (1)

Okay WAIT A MINUTE HERE... i have a feeling this is going to get confusing again. The aussie cars have the same pattern as the gsl-se right?? Wouldnt they have the same rotors then too? The -SE had stud/lugnuts. It seems odd that mazda would go to the trouble of making different rotors. In the US all the 1st gens except the GSL-SE have lugstuds.

S2-13BT

Oz cars -
'79-'80 Series 1 - Solid & small discs, 4x110mm, +20 offset using studs (I assume you mean studs that screw into the hub, as opposed to nuts that screw onto a bolt).

'81-'83 Series 2 - Solid & small discs same as S1, 4x110mm, +20 offset, using studs.

'84-'85 Series 3 - Vented & bigger discs, 4x114.3mm, +38 offset, not sure on the studs or bolts.

djmickyg

u sure they were all solids? the i just got some new ones and they were ventend. and it had in the book that they came out with vented??
and i think the S2 were slightly larger than the S1

Directfreak

iTrader: (2)

Front = Vented
Rear:
S3 and GSL-SE = Vented
The rest = solid rear discs.

S2-13BT

Sorry, you're right... I meant vented. The S1 and S2 are the same size though at 228mm.

I don't know what I was thinking (or if I was thinking).