Hi all! Just bought my first toyota (86 22r 4x4). It has 232000 miles with about 5000 on the motor. I have noticed that the breaks are pretty spongy. If i press down fast and hard it will fell like it has lots of pressure but the kind of pop and then get spongy again. No fluid is leaking anywhere. The master cyl was slightly above the min line and the fluid is pretty nasty. Should I replace the master and bleed out all of this fluid?

 

Welcome to Yotatech!!!

There's TONS of info on here about brakes!!! Please try and search around, you'd be surprised what you can find.

It sounds like you need to bleed it really well. Then go from there.

 

So you get good pressure for a moment then a little 'pop' type feeling and the pedal goes to the floor? Not good.
Flushing may help but I'd suggest removing and cleaning up the calipers and servos in the process. If the fluid is as bad as you're saying, there's likely a lot of rust built up and you don't want to suck that in and ruin otherwise good seals.

 

It doesnt go to the floor just down a bit after the pop and isnt as firm. Maybe just a good bleed is all I need.

 

That you are feeling a 'pop' itself is enough to warrant a good going over.
Otherwise, I hope you're not in SoCal in the truck behind me.

 

Like he said, take the calipers off, compress the pistons, change the fluid in the system, test drive in area with more open space then traffic and see what happens.

I would not jump into changing the MC unless you know it is bad.

 

Its funny you mention that. I was visiting temecula and san diego last week. But i was driving a corolla heh. I noticed today that the brake fluid had dropped almost 1/4 an inch. Still no visible leaks. I am going to start the hunt tomorrow for the cause.

 

if you arent losing fluid, then it is probably leaking into something else. take care of it ASAP. probably rust destroying seals and the brake fluid is escaping under pressure.

 

It was leaking into the booster. Replaced the mc and its much better but i think the booster needs replaced still. Would fluid leaking into the booster for an un known amount of time damage the booster? I got in contact with the old owner today and he said that it leaked down the pedal onto his foot once so this just verify this is where the leak was.