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Posted: 5/17/2002 5:52:55 PM EST
Ford (of course) rear disc brake piston seems to be stuck. My friend cannot collapse the piston in order to replace pads. The other rear worked fine. What strange problem could this be and what is the next step.
Thanks for any help, HARV
Link Posted: 5/17/2002 5:54:07 PM EST
Link Posted: 5/17/2002 5:54:59 PM EST
What are you trying to collapse the cylinder with?  Do you have a C-Clamp? Did you take the top off your brake fluid resivoir to releive the pressure?
Link Posted: 5/17/2002 5:59:23 PM EST
Hello, Just Brakes.
Link Posted: 5/17/2002 5:59:58 PM EST
What are you trying to collapse the cylinder with?  Do you have a C-Clamp? Did you take the top off your brake fluid resivoir to releive the pressure?
View Quote

Cap is off, extra fluid sucked out, even the bleed valve is open. He is using an 8" c-clamp.

Thanks for the quick response, guys.
Link Posted: 5/17/2002 6:01:48 PM EST
How does your parking brake work? Being as you said that you are working on the rear brakes, most turn out a cam or piston for the parking brake. this may require a special tool or a little thought to get the piston to retract. Most pistons faces have some kind of slot or socket for the tool to fit in to return the piston to its original clearance. Most libraries have service books you can copy from if needed.
Link Posted: 5/17/2002 6:03:24 PM EST
Well hell, did you try some CLP??  People here put it on everything, even salad, so it might work.
Link Posted: 5/17/2002 6:13:26 PM EST
How far ya want to get into it? You can remove the caliper from the line and use compressed air blown through the fitting to pop the piston(s) out, being sure to cover the caliper with a rag cause they will be movin'. Unless they/it is frozen in the bore. Then ya trade yers in for a rebuilt one. Good luck!
Link Posted: 5/17/2002 6:15:43 PM EST
Got the answer! There are slots on the piston, and the 24hr. Auto Zone will loan the tool. I told the neighbor to read the book first, Next Time.

Thanks for the responses, specially scrub
Link Posted: 5/18/2002 4:59:00 PM EST
If I may offer this,changing your brake fluid every 2 years or so will prevent this in the future. The fluid pulls in moisture into itself. This in turn causes rust to form in the calipers . American manufactures don't tell you to change the fluid but the German ones do! If your fluid is black in color ,it has become contaminated by small rubber particles from normal wear.These particles clump in the lower parts of your system and this then attracts a moisture build up in this location that leads to the rusting and caliper piston sticking problem.
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