99 suburban k1500 6 lug drums

[alvaroemg]

Here is the MC!

 

[1998_K1500_Sub]

Here is the MC!

To me the MC pictured appears to have the large “quick take up” bore / piston, as witnessed by the flare the casting.

In that case the 3” / 76mm piston calipers are appropriate as they would be “low drag”.

 

[alvaroemg]

To me the MC pictured appears to have the large “quick take up” bore / piston, as witnessed by the flare the casting.

In that case the 3” / 76mm piston calipers are appropriate as they would be “low drag”.

Do you have some part #s for the 3” calipers? Or to what vehicles do they belong?

 

[1998_K1500_Sub]

Do you have some part #s for the 3” calipers? Or to what vehicles do they belong?

The 3” is the standard GMT400 replacement caliper, e.g., from RockAuto et al, for at least JB5/JB6 RPO brakes, e.g., ACDelco 18R746C.

You can confirm the diameter by measuring.

 

[alvaroemg]

I took some measurements of calipers I purchased from Napa.

Outer sides are 2.75” and inner length is 2.5”

 

[1998_K1500_Sub]

I took some measurements of calipers I purchased from Napa.

Outer sides are 2.75” and inner length is 2.5”

I’ve read those pistons may neck down at the visible end, so a “3 inch” piston might measure less, there.

Reportedly there were some GMT400 calipers with 63mm pistons, see
https://www.gmt400.com/threads/jb5-...g-help-with-models-to-pick.59172/post-1363086

@Schurkey, what do make of this measurement? Are those 3” pistons?

 

[alvaroemg]

Raybestos shoes are getting replaced with acdelco shoes. Way too much dust

 

[alvaroemg]

.

 

[1998_K1500_Sub]

Lots of meat left on those shoes, if it was my truck I would leave as-is.

This one pictured should be facing toward the front of the vehicle. If not…

 

[alvaroemg]

Both sides the shoe with the less coverage faces towards the front.

These shoes release alot of dust, would the ac delcos not be any better?