I'm helping my son replace his front calipers on his '85 4Runner. We got them installed, but they do't seem to be working. When trying to bleed them, I can see them pulsing a little bit, but they wont close up and grap the rotors. The master cylinder was also replaced, which i bench bled. When I disconnect the brake lines to the calipers and have him push the pedal, I seems like a good stream of fluid comes out. When We're bleeding them, some air bubbles come from the hose hooked to the bleeder screw. The rear brakes and LPV bleed fine BTW.

Did I forget to do something?

Any suggestions?

 

Did you get OEM replacements or upgrade?

:wabbit2:

 

OEM replacement.

 

What method do you use to bleed them? I find the "5 pumps, hold, open bleeder, hold, close bleeder, release" method works very well.

 

I use that same method, usually 3 pumps though. I think the flares on my brake lines I made were the problem. I bought some premade 12 inch long lines and bent them to shape and they worked fine. The original left front caliper was frozen BTW. The entire brake system bleed great, but it still feels spongy. Could the booster be bad?

 

did you bleed the master cyl first?

 

Yeah, I bench bled it.

 

I replaced my entire break system except for the booster and mine felt spongy too. Come to find out with the lift I have the lspv valve in the back was the problem. It was not pushing any fluid to the rear wheel cylinders. After I made a bracket where the rod connects to the rear end I re-bleed the brakes and got a good pedal. Not sure if this would be your issue or not.