14 bolt rear brake questions

[bassackwards]

Building my 14 bolt to go under my Blazer and I have questions about wheel cylinders

Rockauto is showing different rear wheel cylinders for the K20 and K30.

Which should I use?

 

[bassackwards]

D60 in front if that matters

 

[sweetk30]

drum size = what to use .

11" drum or 13" drum ?

looks like drw would be the bigger bore as it would be 13x3.5" drum / shoe size .
some srw could also have the same drum size in srw drum width .
lots of 3/4 ton rears had the 11" drum size and would be the smaller i would think .

hope this helps .

 

[bassackwards]

Drum size is 13" 2.5" shoes.

I'm wondering if the rear cylinders are matched to the front calipers in any way

 

[sweetk30]

matched to the master cylinder bore size .

what master and booster system do you plan to use ?

i swap all my stuff to hydroboost much better pedal feel and gets you the big master for the big 1ton brakes . if you cant do this then make sure you try and get as close as possible in master size to the orignal for a better pedal .

this is my opinion of pedal feel and may not be 100% true fact . just what works for me .

 

[bassackwards]

I was going to use my original K5 master cyl but I have a hydroboost system off an 84 K30 on a frame I'm disposing of. I'll snag it off of there along with all the brake hardware.