Need advise quick on Brake Booster upgrade

[ZZ4x4]

My master cylinder failed big time this weekend and there is brake fluid running out of the booster /forums/images/graemlins/eek.gif. Thought it would be a good time to upgrade to the 3/4 ton booster and cylinder. I read the other post last week saying the 1-ton booster/ cylinder requires too much foot pressure and to get the 3/4 ton unit. This sounds strange to me. Then I looked up the part numbers. For a '79 for example, the 3/4 ton and 1 ton have the same part numbers if you have the JB7 brake system. The other option on the 3/4 ton is the JB6 (7800 lb GVW) system. I'm thinking that the JB7 (8200lb GVW) system can be identified by the 13" 14B rear rotors as opposed to the 11" rotors??? I do have the bigger rotors so should I get the JB7 master and booster or go with the JB6 stuff. Please let me know what you did, if you've done the conversion.

Thanks,
Jeff

 

[Muddytazz]

Yes, I went with the JB7 stuff when I upgraded mine and they work great /forums/images/graemlins/thumb.gif

 

[ZZ4x4]

Excellent. Thanks. Did you notice lots less brake effort required? I didn't really have a problem with the brake effort before, but less effort would be a plus.

 

[Muddytazz]

There was a very slight change, almost unnoticable really in the effort department, but a lot better in the stopping department /forums/images/graemlins/thumb.gif