Help with Calipers

[mr4454]

Hello All,
I'm in the process of rebuilding my front end (1978 K10 4x4), I have no idea which brake system JB3, JB5 or what I have. To complicate things more there is no glove box let alone a sticker... I don't know the condition of the calipers as I never drove it. I would like to upgrade them if possible for better stopping. I plan on keeping the drums in the rear. Your advice (part number) and any suggestion you have will be very helpful. Hope the pics help

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[Arkansas_V8]

I am gonna say JB5.

http://67-72chevytrucks.com/vboard/showthread.php?t=209390

http://forum.73-87chevytrucks.com/smforum/index.php?topic=28592.0

Couple good reads on the subject.


Look up everything you need for a JB7 swap.

My old Suburban was also a 1/2 ton with JB5, my new(like as in not the old one.LOL) 3/4 ton Suburban has JB7. I noticed it as soon as I first pushed the pedal.

 

[mr4454]

that was good reading however, I'm now more confused. Do I need to change the master cylinder and the booster if I want to do JB7?

 

[scenic760]

I am gonna say JB5.

http://67-72chevytrucks.com/vboard/showthread.php?t=209390

http://forum.73-87chevytrucks.com/smforum/index.php?topic=28592.0

Couple good reads on the subject.


Look up everything you need for a JB7 swap.

My old Suburban was also a 1/2 ton with JB5, my new(like as in not the old one.LOL) 3/4 ton Suburban has JB7. I noticed it as soon as I first pushed the pedal.

that was good reading however, I'm now more confused. Do I need to change the master cylinder and the booster if I want to do JB7?

I see this is a 2 year old thread but I too have the same question!

I have rebuilt my brakes with the JB7 calipers up front (coming from the JB5) and left the stock drums the same. I am looking at my master cylinder right now and the rancid fluid in it and saying to myself why did I think I was going to reuse this?!