My brother just bought a runner. I drove it, and it has some crazy braking problems. It has newer rotors and pads. When we go to brake it requires alot more stopping room than my other 2 runners. Also, he flushed out a ton of dirty brake fluid, replaced it with new stuff, and 3 weeks later it is dirty again. I was thinking this could be the work of a bad master cylinder, anyone else wanna chime in?

 

Newer rotos and pads...but how long has the 4Runner been sitting.

Check the pads/rotors yourself. Make sure all the air is out the system by bleeding it properly.

Some more elaborate symptoms of "a lot more stopping power" being required would be helpful.

 

X2 on wab post

If it looks dirty after 3 wks and you guys really flushed out good. What grade fluid are you using, I had dot 3 and had similar dirtiness and poor braking, toyota recommends DOT 4, don't even consider DOT 5 its totally different and not compatible. Also check your resevoir cap as brake fluid has an infinity for h2o.

 

If the vehicle is "hard to stop" and the pads and rotors do look fine and the pedal pressure is fine, then, almost certainly, the booster is weak and on it's way to it's final resting place




Fred

 

Well on my other 2 runners I can push down the brake pedal and it will work work a lot more effectively. This one it seems like we have to push it down all the way, and even then it doesn't come to an immediate stop.

 

Some remachined rotors and drums will fix that.New pads and shoes(properly adjusted)and she'll stop on a dime and give you 9.5 cents change!Don't use cheap s@$#!
Bigblock

 

Push it down all the way to the floor ??????



Fred

 

It doesn't hit the floor, it feels a little spongy even after bleeding all the lines

 

bled the rears and lpsv too?
and rear shoes adjusted?

 

I would say adjust your rear shoes first like abcedarian is saying. It makes a big difference to how the whole system feels.