89IROCZ28

iTrader: (14)

Does anyone know if the 15" '89 IROC two-line rims will fit on a '95 rear w/ disc brakes? I believe the calipers are single piston.

Thanks.

JamesC

iTrader: (5)

Yes, single-piston PBR's.

JamesC

89IROCZ28

iTrader: (14)

Do you know if the 15" version of the 89 IROC wheel (two line) will fit over that disc brake configuration? Thanks.

Pat Hall

iTrader: (31)

I'm running the exact same rim on my 89 RS with a 91 PBR disc brake rear, and they clear just fine. It's a close fit, but they do clear. As far as I know the 95 PBR calipers are identical to the 91's, so it should work. The only way it would be different on yours is if the 95 rotors are a larger diameter, but I'm pretty sure they're the same diameter (11.65") as the 89-92 rotors. I run 16x8 rims in the summer, but I use the 15x7, double-line Iroc rims in the winter for my snow tires. Btw, I also have 1LE brakes up front, and there's actually more clearance on the front setup than the rear surprisingly.

89IROCZ28

iTrader: (14)

Pat - Thanks for the information. But, now I have conflicting information. The person selling the rearend got back to me over the weekend and says they won't. So, that leaves me wondering if the setup is different in some way that I'm not aware of. I guess the only way to find out for sure is to take a wheel and try it.

I never would have thought the 1LE setup would fit under the 15" rims. That's good to know, too.

Thanks again.

JamesC

iTrader: (5)

Pat's correct about the PBR's. They're virtually the same from 89-97, though the Lt1's have a rubber vibration piece. I doubt that this latter, however, would be an issue where OE IROC wheel fitment is concerned.

JamesC

89IROCZ28

iTrader: (14)

James & Pat - Thanks again for the information. It will worth the hour's drive to find out for sure.

Is there anything else I need to know about swapping the stock 2.73 peg leg rear end w/ this one? I realize the proportioning valve should be changed for a disc/disc unit and the speedometer drive gears will need to be corrected. But, other than that is it basically a bolt-for-bolt swap? Also, is this rear the same width as the stock '89 or is it 1-2" wider and does this pose any problem that has to be worked out?

Saber

iTrader: (2)

If the whole rear is from a 95 the tires will sit flush with the rear quarter, You might need to roll the fender to prevent rubbing

Pat Hall

iTrader: (31)

Yeah, technically you're supposed to swap out the prop. valve, but I'm still running the drum one on mine, and the brakes seem to work just fine. I've got a brand new 1LE prop. valve sitting in the GM box out in the garage, but I hate disturbing the brake system and having to bleed all the lines again, so I keep putting off changing it out. From what I've read on here, the rear PBR's require about the same fluid volume as the drum wheel cylinders, so that's probably why the drum prop. valve works out ok. I will tell you one thing though, your choice in brake pads can make a night and day difference. When I first put the 1LE's up front and the PBR disc rear out back, it virtually felt no different from my original 10.5 front disc/rear drum setup. I put Bosch ceramic pads on all four corners, and it felt like my stopping power doubled. So I highly recommend ditching the stock AC Delco pads and going with a good, aftermarket (Hawks, EBC, Bosch, etc.) set. I just put a set of Raybestos ceramics on the front discs of my 69 Camaro, and they're working really well too.

89IROCZ28

iTrader: (14)

Saber - Thanks, that's what I wanted to know. I thought I read they were wider.

Pat - Good to know as well. If I end up buying & installing the 95 rearend, I'll hold off changing the prop valve unless the braking balance is off. Although, I didn't think it was an issue of volume, but more of pressure due to the difference in the piston areas between a caliper and wheel cylinder.

Have you found a 'best value' when it comes to brake pads? Seems like some brands are just out to gouge you for their name.

Saber

iTrader: (2)

I have pics of my car with stock 15in RS tims 235's and a 95Z rear end if you want them. It is wider it just doesnt stick out like everyone says

JamesC

iTrader: (5)

Two inches per side.

JamesC

Toyota h8r

back when i had my 95 trans am i had to use a set of 15" firebird mesh style rims on the rear end to get me to work for a week til new tires came in lol...

car looked like a lowrider with the tires hanging out in the back....



but yah no rubbiing

Saber

iTrader: (2)

95z rear end with stock 1991 RS 15 inch rims with 235 size tires on there.

Pat Hall

iTrader: (31)

I totally agree with you on the "price gouging" deal. The Bosch pads I was recommending were a whopping $120 at CSK Auto when they still sold them. I don't think they even have them available anymore. But I scored them for dirt cheap off ebay, and the same seller still has more of them available. Here's a link for the rear ones that fit all the PBR disc rears from 89-97. Part# for the pad is RBC413. Only $34.99 plus shipping! For that price, I stocked up and bought two sets for mine. http://cgi.ebay.com/ebaymotors/BOSCH...Q5fAccessories Here's another link for an affordable set of front pads for non-1LE thirdgens. http://cgi.ebay.com/ebaymotors/Chevy...Q5fAccessories

89IROCZ28

iTrader: (14)

Now that's the kind of bargain I like to see! Thanks!

I don't mind paying a little more for a better product. But, c'mon ... isn't $120 for brake pads a bit outrageous?

Great post Pat!