This is the third time I have posted a similar question with no answer. Search search searched. Corvette brakes, ls1 brakes, lt1, yadda yadda. Thats all fine and dandy if you have 16 inch rims or something larger. bling bling.

I have 15 inch rims for the drag strip, and cant find anything better than stock discs for the rear. What options are there for 15's???

15 15 15 15 15 15 geez

Your best bet is the stock PBRs for 89-92. But, I'm not sure whether the stock PBR discs will fit inside a 15" wheel. I know they have trouble even with some of the stock 16" wheels.

Think about what you're asking, for about 2 seconds. The PBR rotors are just shy of 12" diameter. The wheel bead is 15" in diameter. The wheel has thickness; let's say, ½" thick, just to pluck something from the air. OK, that leaves you 14" diameter inside the wheel. The inside of the wheel isn't a cylinder, it's a cone, that gets smaller toward the spokes. Let's say, another ½" if "cone-ness". OK, now you're down to 13" of space inside that wheel. You are now left with ½" to fit a WHOLE CALIPER, with enough clearance so that the inside doesn't rub the rotor and the outside doesn't scrape the inside of the wheel. Don't think it's going to happen but I could be wrong.

It's all numbers... easy ones, just barely even arithmetic, let alone math. Just add em up and see why things will or won't fit.

So no camaros came with 15s and disc brakes? I think s10s did, I wonder if they would fit?

I thought there would be some world wide info on this.....most drag racers use 15" wheels, and they can't be using drum brakes.....

Wait I take that back, I have seen some, but they are recommended for drag only. I want to drive this on the street often, and I dont think the discs are meant for continuous heat.

All the S10 brakes were same as mid size cars. Something like 10" and some change.

Well that might be my ticket then. They should mount the same...........I have an s10 I can look at, but not a camaro with discs. Anything is better than these drums....

If I end up going with an 8.5 rear, theres tons of stuff for discs out there.......

You could do SSBC Force 10 plus one calipers which bolt to your stock spindles and are a dual piston. Thay also make slotted rotors to replace the stockers. Completely flush the fluid and put in DOT4, add Earls Hyperfirm braided line kit. The S-series isnt any better in the front. But you might be able to upgrade the rear with the rear disc setup from one. They use a 7.5/7.625 rear. The e-brake is probably going to be the hard to adapt part

On the S10 rear look at the S/T-Series Blazer/Jimmy/Bravada.Most of the 2nd Gen('95-'03)had rear disc brakes as an option.Only catch is to find 8.5" ring gear 10 bolt on one it will usually be a 4WD.These axles are roughly 2" wider hub to hub than the 2WD(I'll have to measure mine to be certain of the difference).Then the ZR2 rears,which are most often 8.5",are wider still(by another 1.5").They all use a 10.5" rotors same as the Camaro's general rotor size.You're right in the thinking most of the racing 2 piece rotors are not really streetable.It goes along the same thinking of picking the right pad(heat range)for the street with limited track duty.The '82-'87 F-Body used 10.5" rotors front/rear as far as I know(either with 14" or 15" wheels).But the Delco Moraine rear iron calipers can be a pain at times.

i'd go LS1 12 inch brakes. 4th gen guys run 15 inch drag wheels for their cars all the time, but some brands/models of wheels require alot of caliper grinding, while some only minor grinding. then some like bogart custom fit wheels dont require any grinding.

it all depends on the wheel tho. What drag wheels are you using?

Weld draglites probably. 15x10. Are they different caliper manufacturers from year to year making them bigger? Wonder how you'd find out which ones are the smallest.
I didnt think they would fit at all, if all I have to do is grind, I'm a pro at grind and fit, lol.

I thought only zr2s came with the 8.5". Why would the width of the axle affect the brakes? Speaking of which, I forgot that they are wider, hmmmm wonder if it would be wide enough to fit under my car......

Remember though, AFAIK, that the third and fourth gens are the only cars with a sliding torque arm setup, which would need mounts welded to any non-3rd and 4th gen F-Body rear.

Yep I've been trying to figure that out....do I go with an 8.5 and use a 4-link and tear up my floor and do a bunch of fabbing, or just dish out the money for a 12-bolt or s60....

I just put the cage in, floor is bare, I have lots of bar stock....but that doesnt sound fun at all......

I have the stock rear discs on my car, which came with 15" factory "kitt" wheels. Heck, they could have had the 14" kitt wheels, and probably came with the discs. I was going to try to just move these discs over to an 8.5" rear eventually, (think they'd go on?)
Either way, let me know which brakes you go with. You're doing front and rear?

I mention the axle width just as a reminder and I didn't even think of the torque arm mount,thank you The ScaryOne.There are non-ZR2,or HighRider for GMC,that came with the 8.5 ring gear 10 bolt but it is uncommon.And as Sonix pointed out,and I did previously,the early 3rd Gens('82-'84 even '85) could have 4 wheel disc brakes and have 14" wheels.These were the same J65 optional rears on the Z28 and part of the WS6 package on the T/A.

other than the PBR or LT1 style discs, and the LS1 style discs, i'm not sure what else is available. caliper grinding is easy, just takes some time to get it all fitting just right.

i'd look at wilwood to see what they have for rear discs.

The best brakes that fit 15" rims I've seen that could be easily gotten are the 4 piston brakes from certain RX-7s from 86-92. I just don't know how you'd go about fabbing a bracket for it, or what rotor you could use them with, but they're very, very nice brakes!

I've also heard good things (and bad things) about the toyota pickup 4pots but not sure about fitment.

But anyway, don't worry about rear brakes too much... even if you're endurance racing you probably wouldn't have to upgrade past whatever disc brakes came on your axle unless you had the motor in a doghouse sitting beside you in the cabin and a really, really big wing on the back and a different brake bias.