Can't compress caliper cylinder on rear brakes 2003 deville

Does anybody have any experience with rear brakes on 2003 deville? I can't get the rear calliper to compress. I don't want to force it too much and break something. It does have the emergency brake cable going to it which is not currently engaged. It also has an additional spring on the side which I suspect is to keep tension adjustment on the emergency brakes as the pads ware. It may be that the tension has to be relieved from the emergency brake spring adjuster prior to compressing the caliper but I see no aparent way of doing this. Damn caddys! Any suggestions? Much appreciated as I am stranded on jack stands in the driveway!

Thanks,

Bud

The piston has to be turned inward while pressure is applied to it, there is a special tool that accomplishes both functions. You should also open the bleeder while doing this and have a tube connected to the bleeder and run into a container of fresh brake fluid. Not just Cadillacs have this design caliper, if you are unfamilar with this type of repair maybe let a pro do it. BTW, welcome to AF.

The piston has to be turned inward while pressure is applied to it, there is a special tool that accomplishes both functions. You should also open the bleeder while doing this and have a tube connected to the bleeder and run into a container of fresh brake fluid. Not just Cadillacs have this design caliper, if you are unfamilar with this type of repair maybe let a pro do it. BTW, welcome to AF.

Thanks a bunch, Pretty familiar with most repairs etc. I will try Pep Boys and see if they rent the tool.

Have a great day!

Bud

Thanks a bunch, Pretty familiar with most repairs etc. I will try Pep Boys and see if they rent the tool.

Have a great day!

Bud

The tool is cheap to buy, like $8 or so. It's a little cube that fits many types of screw in brake calipers, so it's great to buy one!

As CD says, ask for a "brake cube".

Brake cube in itself is really not the right tool , as the piston most time requires inward pressure to retract, while turning, that is why there is a "true" special tool set for this purpose.

MW,
Thanks for the heads up. Do you have a link or pointer or a name for the specific tool? I've always used a cube, but have never been particularly satisfied with its operation.

MW,
Thanks for the heads up. Do you have a link or pointer or a name for the specific tool? I've always used a cube, but have never been particularly satisfied with its operation.
Napa has it in there tool catalogue, the usual Snap On, Matco of course. It has several adapters for the different spacing on the notches in the piston for just about all cars using this design and the clamping tool that also turns the piston at the same time. Check batauto.com's tool store also. Just looked it up, Lisle 2500, 75.00 for kit, this is a pro quality tool.

MW,
Many thanks. I now have five vehicles under my care, my Eldo, the wife's Camry, daughter's Mitsu, my Chevy van, and future son-in-law's Corolla. An investment in some better quality brake tools is a good idea.