j20 brake booster conversion

[TexasJ10]

I know this topic has been up numerous times but I can't find it. Will a J20 power brake booster bolt in between the fire wall and the master cylinder? I would like to replace the booster on my j10 with one from a J20 to get a little more stopping power, but I am hoping that I do not have to swap the master cylinder and bleed the brakes as well.

[TexasJ10]

As a follow on question, did the J20 after 1979 come standard with the duel diaphram booster?

[orangecherokee]

from what i've heard it's a clean swap. i've even heard of people bringing in their single diaphragm boosters and passing them off as DD boosters for the core charge.

[imported_Big Red]

For about $40 you can convert over to a hydroboost setup and you WILL NOT be dissappointed!!!

[turtlejoe]

Originally posted by orangecherokee:
from what i've heard it's a clean swap. i've even heard of people bringing in their single diaphragm boosters and passing them off as DD boosters for the core charge.Yep. Bought the new one and took the old one back 2 days later - no problem.

The swap should be direct, just remember to keep the spacer that's between the firewall and the original booster - you'll have to reuse it. Changing the MC is not required. Can't help with the '79 and later question .

You can remove the booster without detaching the spacer from the firewall. From under the truck you should be able to loosen 2 of the 4 attach points from booster to spacer, and the other 2 you can get from on top. Beats twisting yourself up under the dash. I haven't actually done it that way (I did it the hard way of course) but others have.

Good luck!