Hello,
I have a bit of a problem...I just recently purchased a 89 4Runner and i have no brakes. I just bought new rotors, calipers, and pads for the IFS front. We finished the brakes in my auto class and bleed the brakes. As i was going to bring my truck home, the break pedal pushes to the floor with no pressure. Now i have topped of the break fluid but have not checked the rear drums yet. what could it be? possibly a master cylinder problem?

Thanks

 

Welcome to the forums;

So you bled the brakes? Can you explain the process of how you did this please? Often it's a simple mistake.

If you did not empty the master, and did not touch the rears (only new pads, rotors and calipers), then there should be nothing wrong with the rears. This is assuming the brakes were good when you drove it in. My guess would be that the calipers simply haven't been fully bled out. With 4 pistons each, they're really big internally and hold a lot of fluid.

Bleeding fronts;
.....◘ Top up brake fluid, leave cap off
.....◘ Helper to press on brake pedal firmly
.....◘ Open RF bleeder screw, then close
.....◘ Helper releases brake pedal

You repeat 2,3 and 4 until you get steady fluid from the bleeder, then repeat all steps on the LF caliper. This should eliminate any air in the brakes, and restore your pedal.

 

Clamp off your lines, and pump the pedal. If it goes to the floor, it's probably your master cylinder.

Rebleed it going passenger rear, driver rear, passenger front, driver front.

And I dunno if you flushed it, but if you just pushed the pistons back in, you could have pushed some debris into the line causing it to get clogged.