i have a 88 4 runner v6, all stock. found out my MC is leaking and would like to see if there is an upgrade i can do to give me a better braking feel. my brake pedal feels weak.
or should i just replace it with a new one

 

I have a brake booster and master cylinder off of a 95 4Runner on my 86 4Runner and it made a nice difference in braking. If i remember right the master cylinder on later model trucks and 4Runners have a larger bore, (I think its a one inch bore) that will improve braking.

 

http://www.pirate4x4.com/forum/showthread.php?t=251887

good info here, and there's a great writeup from EricB on all the variations he's tried. I learned a ton from these threads before doing my brake swap on my 84. Of course it brakes great, but runs like crap now so I can't even enjoy them.

I put in the MC and BB from a 95 4runner.

 

sweet thanks, guess i should be looking for a MC and BB from a 95 Runner.

 

which one out of this list?

http://www.theautopartsshop.com/Sear...%2FCE130.44720

 

I pulled the MC and Booster as one piece from a 4runner at the junk yard. Most of the yard should have plenty of them thanks to cash for clunkers.

The MC is the 1" bore and the booster is a dual diaphragm.

 

so find a 95 4 Runner V6? we dont have much at our junk yards since everyone here builds them into off road vehicles

 

The first or second one should work just fine. That site has some good prices.

 

thanks its also the cheapest i have found. still need to see what the junk yard has

 

I had the same problem with my 85. With the bigger rear axles and brakes off an 87, the MC just couldnt keep up. I ended up using an adjustable proportioning valve from jegs to replace the load adjusting factory one and a 1" bore MC. Braking is great now.