99 suburban k1500 6 lug drums

alvaroemg · Mar 11, 2024

Schurkey said:
I'd be far more worried about the drilled/slotted aspect of the rotors than the weight difference.

I looked-up your NAPA calipers, I don't see the piston diameter listed.

Hmm .. I still have not installed them. Any specific reason why I should know the diameter prior to installation?

What should I look for on them?

I was looking at the AC Delcos on Amazon for about $45/ea. As well as the Power Stop red calipers for about $120 for the pair but decided on the NAPAs..

thanks

1998_K1500_Sub · Mar 11, 2024

alvaroemg said:
Hmm .. I still have not installed them. Any specific reason why I should know the diameter prior to installation?

What should I look for on them?

The 3" piston calipers were "low-drag" calipers used on at least the JB5/JB6 brakes and were provisioned with a "quick-take-up" MC.

The larger piston calipers were not "low-drag" calipers, were used on at least the JB7/JB8 brakes, and were provisioned with a conventional (not "quick-take-up") MC.

Mis-matching the calipers ("low-drag" or not) with MCs ("quick-take-up" or not) can produce poor results, e.g., see www.gmt400.com/threads/gm-low-drag-calipers-a-discussion-on-jalopyjournal-com.60055

Three different calipers are illustrated here:

JB5 Rear to JB6 Drums 6 Lug - Help with Models to pick

I have the NBS MC. I have the NBS MC as well and I'm very pleased with the brakes. However, knowing what I know now, I would recommend the JB7+ MC instead, but I'm not about to replace my NBS MC and I don't suggest you replace yours either. The NBS MC has a notably larger bore (1.34" / 34mm)...

www.gmt400.com

Back on the topic of "low-drag" calipers, see the .pdf file from Bendix (Bendix of "Bendix brakes" fame) attached in this post:

Whats wrong with gmt400 brakes?

I just wanna ask what's wrong with these trucks brakes. What is it that people HATE about them? Why MUST hydroboost be the answer? I replaced the front rotor/hubs and pads with delco parts and rebuilt the rears with carquest parts. (the one near me is still locally owned) the rears consisted of...

www.gmt400.com

alvaroemg · Mar 11, 2024

My MC is Raybestos MC390259.

I will take pictures of the calipers tomorrow and measure the piston.

Geez, all these brake system components is more complicated than what I had ever imagined

Schurkey · Mar 11, 2024

Just be glad that your SUV doesn't have the 254mm leading/trailing shoe rear drums.

alvaroemg · Mar 11, 2024

What trucks have those?

df2x4 · Mar 11, 2024

Caman96 said:
EBC
BTW, this price is for 2.

EBC Brakes RK7013 EBC RK Series Premium OE-Style Rotors | Summit Racing

Free Shipping - EBC RK Series Premium OE-Style Rotors with qualifying orders of $109. Shop Brake Rotors at Summit Racing.

www.summitracing.com

I ran some expensive EBC GD series dimpled/slotted rotors on my Suburban for a while... They were fine out of the box and worked great initially but unfortunately were warped beyond repair in a few months. Not sure why that happened, but I won't be trying them again.

Also regarding drilled/slotted rotors, I'm with the other guys. Completely unnecessary. If anything it actually seems like my Suburban stops better after I went back to a blank face rotor. The more surface area of the rotor that you have in contact with the pad at any given time, the more stopping power is available. Drilled/slotted rotors actually reduce that surface area. FWIU, drilled/slotted is more for cooling purposes, which isn't really necessary unless you're doing panic stops back to back. I suspect that the dimpled/slotted nature of the EBCs may be why they warped so badly, but I'm not sure.

HotWheelsBurban · Mar 11, 2024

alvaroemg said:
What trucks have those?

1500 pickups. One of several reasons I wanted a 2500/3500, and was primarily looking at them when truck shopping. Also some of the Tahoes and Yukons have the small brakes. Seems like the 4x4 ones got the better brakes, from my wrecking yard observation.
OBS/400 series 1500 Burbs got the 11 5/32" brakes, similar to the Big 10/ Heavy Half pickups in the square body trucks.

Caman96 · Mar 11, 2024

df2x4 said:
I suspect that the dimpled/slotted nature of the EBCs may be why they warped so badly

That’s what I’m thinking. I’ve got over 20k on my smooth faced EBC’s and they’re still very smooth when stopping.

1998_K1500_Sub · Mar 11, 2024

alvaroemg said:
My MC is Raybestos MC390259.

That p/n matches with a “quick take up” MC. Let’s see a picture of what you received, then we’ll know for certain.

Assuming that’s the case, you’ll want to pair it with 3” calipers, which are the “low-drag” design.

Many here have swapped those components for the JB7 conventional MC and 80mm calipers (e.g., Centric FRC4413 et al). If your parts can be returned/ exchanged, that option is open to you. If I was you, I would do.

Coveman · Mar 11, 2024

Just for fun I’ll drop the NBS brake upgrade as food for thought. My 99 burb smoked those front rotors regularly (in fact, those rotors are smaller than a mazda 3 of the same year). I did the NBS brake / knuckle upgrade around 100k when the front end was ready for some love and the results were impressive. I dont think I’ve warped the NBS rotors since and have about 100k on them. Hydroboost aside, that might be the biggest bolt-on bang for your buck

99 suburban k1500 6 lug drums

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JB5 Rear to JB6 Drums 6 Lug - Help with Models to pick

Whats wrong with gmt400 brakes?

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