I've changed the front brake pads a number of times with no difficulties: I compress the piston with a C-clamp and pop in the new pads.

Today I wanted to replace the rear pads, but I found that I could not get that stupid piston to budge.

I suspect that it has something to do with the emergency brake mechanism, but I'm not sure.

So, I put it to our best mechanics here: how do I get that silly piston to move so that I can pop in the new pads?

Thanks!

 

Not a "best mechanic" but usually I can make them move using a crowbar as a screwdriver. Since one side of the crowbar is typically bevelled, you have to be careful to prevent slipage.

There's also specific tools you can buy that will do the job easier. One I've seen listed is simply a cube with various protrusions that will fit various rear piston slots. Use a ratchet or breaker bar with it.

I recently had a rear caliper replaced and the mechanic used an obviously superior retractor that had a plate which screwed back to the opposite side of the caliper opening. You then used two wrenches to hold the plate in place while attempting to rotate the piston. Mine didn't move, hence the replacement...

 

Rear caliper pistons are threaded. You have to turn them clockwise to retract them into the caliper.

 

you will bend the c-clamp

 

I was wondering about that, because of the cruciate slots in the piston face.

What would you suggest as a tool for turning it?

 

i've read that some will use a simple allen wrench to retract the caliper. Can't confirm in that's true or not.

also read that you can get a <$10 tool at the auto parts store to do it.

(i'm replacing rear brake pads over july 4 weekend)

 

I use a large flat head screw driver.

 

I've done it with both the correct tool and also just a pair of needle nose pliers. When seperated the pliers fit into the grooves well and make it easy to turn.

I'd say they were about the same amount of effort using either the tool or needlenose pliers.

 

A 3/8ths drive ratchet with no socket attached will fit in the center of the cross-shaped opening. The square head of the ratchet will be diagonally in the opening.

 

this is the tool you need



http://www.sears.com/shc/s/p_10153_12605_0...Specialty+Tools