What type of calipers are these?

[Schurkey]

I'm on my phone and didnt notice the Torx bolts.

Two-piece, bolted-together calipers. To me, that's a sign of aftermarket manufacture. Virtually all OEM calipers are one-piece. One-piece calipers are cheaper to make. There are exceptions--the early Corvette/Camaro 4-piston calipers were two-piece units, and so prone to having the pistons seize that they spawned an entire section of the aftermarket--shoving stainless sleeves into Corvette calipers was the beginning of popular brake upgrades leading to the performance brake aftermarket as it is now.

Zooming in, see those are stock truck pads

Yeah...but for which "stock" caliper piston diameter? The difference is in the spring clip on the back of the inboard pad. Bigger pistons need bigger spring clips to fit properly...although someone that shall not be named but whos initials are ME managed to stretch the spring clip from JN3 pads to fit JB5/6 caliper pistons.

 

[pgutier1]

This is the Tahoe they came off of which had a 4" lift kit. Nothing looked out of the ordinary, I will go back to PNP and take more pics.

Row52

1999 Chevrolet Tahoe at PICK-n-PULL San Jose North 1GNEK13R3XJ363114

row52.com

 

[454cid]

Two-piece, bolted-together calipers. To me, that's a sign of aftermarket manufacture. Virtually all OEM calipers are one-piece. One-piece calipers are cheaper to make. There are exceptions--the early Corvette/Camaro 4-piston calipers were two-piece units, and so prone to having the pistons seize that they spawned an entire section of the aftermarket--shoving stainless sleeves into Corvette calipers was the beginning of popular brake upgrades leading to the performance brake aftermarket as it is now.

Funny you mention that. The rear calipers on my newly aquired 1996 Volvo are two piece. They're a fixed caliper rather than floating, which made them noticeably weird to me. Assuming they're the same as the front, they've made by a company called ATE, which is a European OEM supplier.

Yeah...but for which "stock" caliper piston diameter? The difference is in the spring clip on the back of the inboard pad. Bigger pistons need bigger spring clips to fit properly...although someone that shall not be named but whos initials are ME managed to stretch the spring clip from JN3 pads to fit JB5/6 caliper pistons.

Yeah, I generalized just for that reason. They're not the DRW 459's, but visually I can't tell if they're a 370 or 369 pad.

 

[MrPink]

I am even at a loss for this. Did you take the rotors too? I am betting that it is a kit that was released by SSBC in the early 2000's. I'd shoot them an email and go from there. We use Brembo for all our performance kits through work, so I don't have any contacts at SSBC.

 

[Erik the Awful]

If the price was right, I'd be willing to try 'em and see what happens.

From the guy who says don't mix and match GMT400 and 800 parts? I wouldn't touch them without a lot of research into piston sizes and proportioning valves. Cool find, though.

 

[Schurkey]

From the guy who says don't mix and match GMT400 and 800 parts? I wouldn't touch them without a lot of research into piston sizes and proportioning valves. Cool find, though.

From the guy who says "don't use a two-chamber master cylinder having a huge bore diameter, with low-drag calipers intended for a 3-chamber/Quick Take-up master cylinder."

Proportioning valves don't affect the front brakes. Proportioning valves are in the REAR hydraulic system. Metering (Holdoff) valves are in the front brake circuit, but the minimal "calibration" they have is based on the spring stiffness and therefore initial shoe movement of the rear brakes.

Piston size is a concern; as is matching-up a master cylinder.

 

[pgutier1]

You might want to verify the casting numbers on the steering knuckles. I suppose those could be a conversion/upgrade from a newer vehicle using different knuckles, but again I don't recognize those calipers.

Schurkey...ask and you shall receive. They seem to be the stock knuckles although when I tried to bolt up OEM calipers for some reason the bolts would not screw in like they should. I took the OEM bolts and will check with my thread checker with the bolts off these aftermarket calipers came with and see if there is a thread difference.

OEM calipers and rotors fit just like they should...

 

[pgutier1]

After inspecting the calipers again, I found markings on the back...

 

[HotWheelsBurban]

Every once in a while, the spindle/knuckle will have a bad place in the threads where the caliper mounting bolts go into them. Had to get a tap and clean them out when I last changed the front pads on my Burb, cause the passenger side bolts wouldn't go all the way in. First time I have seen this, after many GM and Mopar disc brake servicings, but proves it can happen. IIRC it's an 11mm thread, take the bolt to match thread pitch.
Not saying that this is the issue here, more likely aftermarket calipers, but just putting it out there....

 

[Schurkey]

These are the markings on the steering knuckles that are on my '88 now. They came from a '92 (?) extended-cab with JB5 brakes.

Clearly marked "GM" and "Central Foundry Division" (CFD) along with the clock symbol for when in the shift they were poured, and--I think--the Julian date code.

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