Rear Brake Calipers (need advice)

[gpd323]

yes post them up, like i said i have the drawings, but it would be easyer to just make it a squared instead of a dog bone shape.

The reason they are dog boned shaped is to clear the CV boot on the inside. I think the outside can be squared off. take a close look at the pictures I posted earlier on this thread.

[ryan1]

so to do the the rear brake upgrade and the bigger master cyl and brake booster you need.?.?.?

91 mazda 929 MC (1 inch should be cast into it)
95 mazda protege auto booster
88-89 4 lug mits galant rotors (265mm ones) can you get bigger ones to work??
90-93 miata rear brake calipers and pads
extended wheel studs (mazda truck,rx-7????)
the adapter/bracket plate (bob make them).
cut ears down on the stock bf hub to fit galant rotors.

someone should make a sticky of this topic once its 100% correct.

[trailrider098]

My new wheel studs were for a 88 mazda B series truck

Now here is what i remember for the galant rotors, this is all from memory so let me know if i messed up somewhere

255MM, the smallest galant rotor, will fit in the caliper no problem and will actuly leave 2MM of unused pad cause the rotor is just a little to small. the easyiest to use cause no extra mods needed besides grinding the ears on the hub. Good cause its much thicker then stock and easy to change outsid of hub.

265MM, the middle sized galant rotor. will fit in the caliper but expect a little rubbing cause its actuly to big. this is fixed by just grinding away a little material from the inside of the caliper till it can be fit together without rubbing

275MM, the big rotor, this came on the Galant VR4 and WILL NOT fit at all unless u are making some new bracket to space the caliper out. Going back to the people who call this the VR4 brake upgrade when you dont even use VR4 parts

[gpd323]

My new wheel studs were for a 88 mazda B series truck

Now here is what i remember for the galant rotors, this is all from memory so let me know if i messed up somewhere

255MM, the smallest galant rotor, will fit in the caliper no problem and will actuly leave 2MM of unused pad cause the rotor is just a little to small. the easyiest to use cause no extra mods needed besides grinding the ears on the hub. Good cause its much thicker then stock and easy to change outsid of hub.

265MM, the middle sized galant rotor. will fit in the caliper but expect a little rubbing cause its actually to big. this is fixed by just grinding away a little material from the inside of the caliper till it can be fit together without rubbing

275MM, the big rotor, this came on the Galant VR4 and WILL NOT fit at all unless u are making some new bracket to space the caliper out. Going back to the people who call this the VR4 brake upgrade when you don't even use VR4 parts

It sounds better when we say VR4 though!!

But, he is missing one important part, the larger 22V 14 caliper. Without this somewhat wider caliper you will not be able to squeeze new pads in the stock caliper.

Even though the stock GTX caliper and the larger 22V caliper can use the same pads. The 22V pads are taller and will cover the whole friction surface on the VR4 (LOL) Galant rotor.

The 255mm is too small as noted above. The 265mm is perfect. But as noted above, may need a bit of dremel to stop some rubbing.

1st time my caliper body had to be ground down a mm or so on the left side only. Right side was fine.

Installed rebuilt 22V calipers recently and the pad backing plate would rub, not the caliper.

[trailrider098]

the 255mm really isnt to small, its a good upgrade from stock because of the ease of being able to change the rotor without rebuilding the bearings. it is about the same size as a protege LX rotor and thicker so in theory this would be about equle to a stock protege LX/EGT, which is alot better then stock BF brakes

[gpd323]

guys,

If you install the Galant rotors and plan on using the stock GTX/GT calipers, this will not work. because the Galant rotor is thicker you will not be able to install "new" pads because there is not enough space. If you use worn pads, Ok that will be OK. But, the stock GTX pads will not contact the Galant rotor completely, only the outer edges.

You will want, the Ford Escort GT (or similar) 14 22V calipers so you can use the larger pads and have space for the new pads.

The 255mm ones do work but the pad material will be taller than the rotor and the pad will overhang the rotor on the outside edge.

[azgtx]

The outer edge can stay straight but the inner has to be radiused to clear the knuckle.

Most places can cross part #'s for the rotors as there are multiples for each
rears 3288 88-89 galant solid rotors
fronts JBR515 31011 9999 121.46024 BD 125004 same car 266mm

These are the numbers that I wrote down off of the boxes that the rotors came in.






Clay

[KMpuggy]

Hi guys, first post here, gotta start somewhere i guess.

Planning on doing the front upgrade on my motor, with the 266mm discs and some mx3 14 22v calipers. Not sure on the correct discs as there have been a few around. Are the discs i want front vented 266mm, 24mm thickness, 45mm height with a 60mm centre bore? I say front as reading some part numbers i kept coming across rears? It all seems an easier enough job so ive just got to source the parts now. Other thing, as the bore of the disc is bigger then the bore on the mazda hub (56.1mm i think) is the any problem with steering wheel vibration at 50+mph? as had that problem with my alloys before i fitted spigot rings.

Read all about it on here, good step by step how to.

http://323gtx.homestead.com/brakes.html

[ryan1]

does anyone know the parts numbers for both front and rear
wheel bearings outer and inner,
wheel seals outer and inner,
and the spacers?

[gpd323]

does anyone know the parts numbers for both front and rear
wheel bearings outer and inner,
wheel seals outer and inner,
and the spacers?

You can reuse the spacers for the life of the car. Since the spacers are specific (matched) to the knuckle, do not mix them up. Make sure you reuse the spacer on the axle/wheel it came off. Make sure if a shop does the work that you tell them this also. You mix the spacers up by accident and you will be replacing bearings again in short order.

The bearings are all the same front and rear. I am having a brain fart here, but I also think the seals are all the same too.

The hubs are also same for all corners.

Make sure you torque the axle nut to the high side of the range.

There were 30 different thickness spacers available at one time, the chances of fitting a new one and having it work was slim to none.

[jay]

Just in case anyone was wondering, there's a very good chance that Mr. Downing knows more about the 323 gtx than anyone who wasn't working for Mazda when they designed it. I'd take his word on this sort of thing with about the same amount of trust as the factory service manual.

[azgtx]

I will second, third and fourth that quote.....he very well could put "Chiltons" out of biz. Greg ...I feel I should thank you again for all the help you have thrown my way. SOOOO THANKS!
Clay

[808]

So I guess i'll 5th, 6th, and 7th the motion!

[trailrider098]

You can reuse the spacers for the life of the car. Since the spacers are specific (matched) to the knuckle, do not mix them up. Make sure you reuse the spacer on the axle/wheel it came off. Make sure if a shop does the work that you tell them this also. You mix the spacers up by accident and you will be replacing bearings again in short order.

The bearings are all the same front and rear. I am having a brain fart here, but I also think the seals are all the same too.

The hubs are also same for all corners.

Make sure you torque the axle nut to the high side of the range.

There were 30 different thickness spacers available at one time, the chances of fitting a new one and having it work was slim to none.

hate to correct but bearing seals r different, there r inner and outters

[KMpuggy]

Ive had a never ending problem with my right rear bearing. I done it just before xmas, and i done it again just last week. Yes i think i made the mistake of putting a different spacer in there ages ago. So when i last done it, i used a spare hub and knuckle from the shed, got hold a spring gauge, a couple of spare spacers i had lying around, and done it all by the book and in tolorance, hopefully it should hold together now.

Something else that might be worth mentioning. Over here im paying about £45-£50 per bearing kit. Now i have found that wheel bearing kits from earlier mazda 323, 1981-85 are a 100% fit, and these only cost around the £10 mark?? The part numbers on the boxes are different, but when you look on the bearings they are the same as they have even got the excact same part numbers stamped on the race and runners, and the seals are the same.