Toyota 4Runner Front Calipers

[Shaun @ Tru6]

I'm rebuilding the entire front suspension on a junk 1995 4Runner. The previous owner wore the pads down to the metal backing and the inboard rotor surface is down to 1/16th of an inch, outboard 3/16.

4-piston calipers.

With the calipers on the bench and pad plates still in, using a large groovelock pliers, I can compress the piston's on the outboard side (fluid is expelled), inboard side seems to be frozen.

Is that the case?

[Hugh R]

Do you have a compressor? If so use it to try and pop out the other piston. Or hook the caliper back up to the brake line and push the brake pedal to try and pop it out, you'll have to block off the brake line on the other side if its open. You can put the other caliper back on with the old rotor to block fluid.

[Shaun @ Tru6]

Thanks Hugh, I'll give it a try, but may just go with rebuilts. these things are as beefy as 993TT calipers, but found out later today they're about $50 each rebuilt, shiny and new. Can't get over how cheap parts are for this thing.

[johndglynn]

Bin them and buy the rebuilts Shaun. The inner pistons in both front calipers in one of my Runners got seized (previous owner = dimwit)and I tried EVERYTHING to undo the pistons when I found out the problem. Got them moving all bar one - seized totally solid. Bought clean used and rebuilt - brilliant job, now have mega brakes again.

[Shaun @ Tru6]

$33 each there's more rust than metal on this truck with 183K on the clock, but it's going to have a great front suspension by the end of the week.

[Jeff Alton]

Humor yourself and measure the bolt spacing on the mounting ears.... then let the imagination tick for a while...

Cheers

[Shaun @ Tru6]

Technical question on caliper clamping force