I'm changing the rear pads on my 05 Lariat and I can;t seem to get the piston compressed! It's REALLY tough. I've already chipped part of it so I'm scared to go any further. I'm using a large C Clamp and I got it maybe 1/4" down, but now it won't budge!

I've done the fronts and those were a piece of cake....is there something different about the backs?

I've searched and saw a discussion about having to rotate the pistons as you compress them, but it was decided that was a procedure for a different model.

It's getting dark and i HAVE to get this done tonight.

PLEASE HELP!

 

Crack the bleeder valve open and try again.

 

Is that at the caliper?

 

Yes, at the caliper. Put the old brake pad back in and use that as a clamping surface, that'll prevent any further damage to the piston.

 

Thanks for the tips.

I normally do use the old pad, and normally that works!

I broke open the bleeder valve and got a steady drip of fluid, but that piston still won't budge. I got a good 1/4 cup of fluid out and no difference.

Anything else i can try?

 

Are both rear calipers not compressing or just the one?If it's only one I'd say it's a bad caliper.If it's both I'd say WTF??

 

I haven't even touched the other one yet, so I'm not sure....

 

I was going to add.... make sure the cap is off of the master cylinder, but opening the bleeder accomplishes the same thing with the downside of having to bleed the brakes plus clean up the mess.

 

You won't have to bleed the brakes as long as you don't remove the clamp before closing the bleeder. Preventing the mess is easy, I attach a piece of tubing to the bleeder and run it into a jar. That stuck piston could mean a bad caliper, did you or someone else press the brake pedal while the caliper was removed? That would have pushed the piston out of the housing making it tough to press in.

 

Im not sure if "FORD" uses this type of brakes on their automobiles. BUT My Wife has an 06 Pontiac G6 and I had to replace the pads on the rear. After about 30min of trying to get the cylinder to compress, I called a friend who was a "tech" with GM... he said that model actually screw's back in. Went out and started twisting the piston with some good channel-locks... VIOLA it worked... Crazy as hell, and I was cursing my butt off. Thought I was some kind of dumb sh*t. My 04 F150 DOES NOT HAVE that, but im unsure if maybe Ford adopted that or not for the 05 +'s You dont have the E-brake set by chance do you? Dunno if that would make a difference!

 

I had an old nissan that did the same thing

 

Put the old brake pad back in and use that as a clamping surface, and use some large channel locks.. Unless you know someone who has one of these:

 

Why don't you put the cap back on the master cyl and try the brake, then let off. You might have turned the truck off before the piston recessed into it's home or the cylinder might have jammed when it recessed or compressed (needs to go in very straight). Removing the master cyl cap should prevent this and be sure to place the rotor between the pads as I'm not sure how far the piston will want to go.