1G 1g Rear Caliper Question

[greddy_1700]

Hey, Just wanted to double check with you guys since I am away from my car for the next three months. On the 1g, are all the rear calipers the same? Like will any rear caliper from 90-94 be the same?

Also since I havnt looked at my car in a while, is there a rear bracket? Or does the caliper just bolt straight on to the hub?

I am getting stuff powdercoated while I'm away from home so I want to make sure I get everything I need coated.

Thanks in advance,

Garret.

 

[dikdiamond]

Yes the rears are the same,single piston calipers throughout the 90-94 models. There really isn't a bracket,either. You only need to remove the lockpin,and flip up the caliper to change out the pads. The caliper bolts are attached to the trailing arm.

 

[steve]

Hey, Just wanted to double check with you guys since I am away from my car for the next three months. On the 1g, are all the rear calipers the same? Like will any rear caliper from 90-94 be the same?

No the rear calipers are different between FWD and AWD. The 90 AWD cars use a smaller rear caliper than the later years, and the 90 FWD cars something else still different. This is not counting any turbo vs N/T differences.

As long as you stay with 91-94 AWD then they are all the same.

Yes, there is a bracket that bolts to the trailing arm and the caliper floats on the guide and lock pins that bolt to the bracket.

Let me find a good picture.

These two should work.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

 

[theebluecrx]

Yes awd cars have larger rear calipers.

 

[DontStartModdin]

AWD=Bigger

 

[dikdiamond]

No the rear calipers are different between FWD and AWD and the 90 AWD cars use a smaller rear caliper and the 90 FWD cars something else different. This is not counting any N/T differences.

As long as you stay with 91-94 AWD then they are all the same.

Yes, there is a bracket that bolts to the training arm and the caliper floats on the guide and lock pins that bolt to the bracket.

Let me find a good picture.

These two should work.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

Crap that's what I get for posting while eating lunch Yes AWD does have bigger brakes sorry for that misinformation

 

[greddy_1700]

Ok Great. Im just about to buy new Front calipers and brackets for the front, so I figured I might as well get the rears done too.

So I need the same as the front then, two calipers, and two brackets, Correct?

 

[steve]

Im just about to buy new Front calipers and brackets for the front, so I figured I might as well get the rears done too.

So I need the same as the front then, two calipers, and two brackets, Correct?

Are you upgrading to the dual piston calipers up front?
Are your existing brackets front and rear damaged other than rust?

People need the matching brackets when upgrading since they are different between single and dual piston calipers. Unless your upgrading or the existing brackets and pins are damaged you wouldn't need them but it would be easier to change it all.

Those in my pictures are the originals after blasting the castings and painting.

 

[greddy_1700]

Are you upgrading to the dual piston calipers up front?
Are your existing brackets front and rear damaged other than rust?

People need the matching brackets when upgrading since they are different between single and dual piston calipers. Unless your upgrading or the existing brackets and pins are damaged you wouldn't need them but it would be easier to change it all.

Those in my pictures are the originals after blasting the castings and painting.

You got it. I'm still rockin the 91 single piston calipers on my car. And since I want to get it all powdercoated at once, thats why I am buying new rear calipers.

So in short, my powdercoating list would go as follows:

Front Calipers (Dual Piston 93-94 AWD)
Front Caliper Brackets.
Rear Calipers (And 91-94 AWD)
Rear Caliper Brackets.

Sound good now?

 

[fastcar01]

I have to mess with our 92 AWD, for whatever reason it is sticking again. This is the third time I have had this issue. I am changing the hoses this time also, as they are a little twisted. The dealer last time asked me which casting# I had. They said there was three different ones. Is this not right? It came as a loaded caliper.

 

[crensinivon]

So the could you upgrade from the 90 rear calipers to the 91-94 rear calipers? Of course I know I would need all associated hardware.

 

[1point8Ltpower]

ok, so.. im kinda in the same boat. I have a '90 awd, built in April '90, so it has different rear brakes. I have the VIPGarage 92+ rotors and pads sitting here because i have the twin pistons in front. How hard will it be to mount the 91+ 1g calipers on back?

 

[PIMking]

Well I tried to change the pads and rotors on my 91 this weekend and the calipers are shot they stick and dont work worth a crap. So I was going to take them off of my 90 and swap them since the ones on the 90 are in perfect working order.

 

[vettesmoker]

A little off the main topic here but the most common problem I have found with sticking rear calipers with my 90 is the proportioning valve. I have smoked 2 sets of rotors past machining, 4 sets of pads and 2 calipers trying to figure this out. Just a thought

 

[toofast82]

[quote="vettesmoker, post: 151761992" A little off the main topic here but the most common problem I have found with sticking rear calipers with my 90 is the proportioning valve. I have smoked 2 sets of rotors past machining, 4 sets of pads and 2 calipers trying to figure this out. Just a thought[/QUOTE]

When i had my 90 GST, i had to replace the rear pads 3 times for once in the front. One of the calipers locked up once, too.

 

[steve]

So the could you upgrade from the 90 rear calipers to the 91-94 rear calipers? Of course I know I would need all associated hardware.

How hard will it be to mount the 91+ 1g calipers on back?

I don't have a 90 so it's hard to answer but I suspect it's just a matter of bolting the brackets to the spindle and attaching the parking brake cable and brake line.

 

[90gst_sean]

We need more info on this...

It's a pain for us lonely few DSM owners driving pre- 5/90 AWD's.

I too, am having issues with my left rear caliper sticking and can't find a local parts store that can get me the 'correct' caliper replacement.

Will the 91+ rear caliper bolt up to the pre 5/90 AWD?

If not, can someone explain... please.

 

[GooeyGus]

I'm wondering the same thing.

I think I have a seized up rear caliper. Luckily it's not seized in the "on" position, but I can see that the outside of the rotor has not had the pad grabbing it.

Obviously it will be easier to find a 91 and up caliper if I need one.

Anyone have any info/first hand experience with putting a 91+ rear caliper on a 90?

 

[90moneypit]

I'm a 3rd guy in Washington with a 90 wondering the same thing. It's my pass rear that's giving me the most problems but they're both dusting pretty hard. I just bought twin pots for up front and I'm going to go brake crazy and replace the 20+ year old lines all around. It wouldn't be MUCH more trouble to swap rear calipers provided they actually mount up and don't use a different e-brake cable (main concern for me).

Does anyone know if they'll bolt up? It seems likely as all the suspension is 90-94 but you never know with a 90 after all.

edit: Searching the factory catalog revealed that the rotor, dust shield and caliper support bracket is the same from 90-94. It also looks like the 90 has it's own rear brake line but then it looks like the flex line is 90-94 as well so I still don't know if it's a straight swap like the front brakes but it MAY be. The good news is that the e-brake cables are the same for all 1g's so it's leaning towards straight swap.

Doesn't anyone know for SURE though?

 

[90gst_sean]

I'm a 3rd guy in Washington with a 90 wondering the same thing. It's my pass rear that's giving me the most problems but they're both dusting pretty hard. I just bought twin pots for up front and I'm going to go brake crazy and replace the 20+ year old lines all around. It wouldn't be MUCH more trouble to swap rear calipers provided they actually mount up and don't use a different e-brake cable (main concern for me).

Does anyone know if they'll bolt up? It seems likely as all the suspension is 90-94 but you never know with a 90 after all.

edit: Searching the factory catalog revealed that the rotor, dust shield and caliper support bracket is the same from 90-94. It also looks like the 90 has it's own rear brake line but then it looks like the flex line is 90-94 as well so I still don't know if it's a straight swap like the front brakes but it MAY be. The good news is that the e-brake cables are the same for all 1g's so it's leaning towards straight swap.

Doesn't anyone know for SURE though?

I was #1 of that 3 guy list in your post here and I can tell you, 100%, that yes, if you go to AutoZone and get their listed rear caliper for the 1990 GSX, what the guy gives you will mount up just fine. I did it three weeks ago and I've had not one issue! And my car still runs, three weeks and counting, and that's damn good for me.

In fact, I will call AutoZone right now and get that part number from the exact caliper I'm running and this will be for all the other 90 GSX's out there that will undoubtedly run into this thread -- with this question --- and so I'll put down the extra effort ---- for the good of 90 DSM's everywhere!!!

And here it is:

AutoZone Part# C8117 (drive-side rear caliper, 1990 GSX) easy to get, and fits for sure!

AutoZone has one part number for ALL 90 GSX's (C8117). It's not until 91 that they change part #'s to C8025. This is different from Schucks/O'Reillys that lists two part numbers for the 1990 GSX, the pre-5/90 (19-1502) and post-5/90 (19-1509). This is where all the confusion comes from.

Now to end all questions: O'Reilly has the Driver-Side rear caliper listed as part # 19-1509 for 5/90 thru 94 but a special number for the early 1990 GSX, however, AutoZone list only one part number (C8117) for all of 1990. With this information, reason tell us that all or any of these part numbers will mount up to any and all of our 1g GSX's. End of story.

I wish I was a better writer so I could make that all crystal clear for everyone; I've tried my best. Good luck!

 

[Calan]

With some patience and about $15-$20, you could just rebuild them.

How to rebuild rear brake calipers

 

[steve]

Does anyone know if they'll bolt up? It seems likely as all the suspension is 90-94 but you never know with a 90 after all.

edit: Searching the factory catalog revealed that the rotor, dust shield and caliper support bracket is the same from 90-94. It also looks like the 90 has it's own rear brake line but then it looks like the flex line is 90-94 as well so I still don't know if it's a straight swap like the front brakes but it MAY be. The good news is that the e-brake cables are the same for all 1g's so it's leaning towards straight swap.

Doesn't anyone know for SURE though?

Evidently not. It does look like that other than the difference between ABS and non-ABS the trailing arms are the same so that implies that the mounting points are also the same.

I really expect that the later rear calipers will just bolt up and work but until one of you tries it, it won't be known for certain.

 

[90gst_sean]

With some patience and about $15-$20, you could just rebuild them.

How to rebuild rear brake calipers

From what I've read, you do not want to attemp a rebuild on these rear calipers as there is some small part that will likely need replacing that is very hard to get your hands on.

I have given the part number in my post above, so there is no more confussion.

 

[Calan]

From what I've read, you do not want to attemp a rebuild on these rear calipers as there is some small part that will likely need replacing that is very hard to get your hands on.

I have given the part number in my post above, so there is no more confussion.

Which small part are you referring to?

Did you read the article above? The only non-reusable part that may be hard to get would be the odd-sized o-ring, but even that comes in a rebuild kit from Mitsu. And I found one at a hardware store that was too close to tell a difference.

If anything else is damaged or worn beyond it's usefulness, then you would need a new caliper anyway.

 

[90moneypit]

From what I've read, you do not want to attemp a rebuild on these rear calipers as there is some small part that will likely need replacing that is very hard to get your hands on.

I have given the part number in my post above, so there is no more confussion.

I think the question was if a 91-94 rear caliper would fit on a 90 without any modification. Autozone is bad, really bad, but occasionally they do manage to put the right year part in the box (I've had rebuilt 96 mirage CV axle end up in a NEW 92 Eclipse CV box before) so I'm not surprised that they can replace with like kind parts. I'm trying to find out if 91-94 GSX rear calipers, which are larger w/o going aftermarket, are similar enough in brake line placement (which seems likely) to work.

I just can't believe no one has tried it in the past couple decades...