View Full Version : New caliper piston not moving
slpro1207
02-10-2018, 01:36 AM
I’m trying to install FFR brakes onto rotor. Left side went great but right won’t go over rotor. I have determined that the piston is pushed out slightly causing the pads to be to close together. However the piston will not move in at all. I used a little bit of air and it moved smoothly out but will not slide in. Also I removed the bleeder valve. This is the FFR standard brakes on the IRS. Any suggestions?
CDXXVII
02-10-2018, 01:57 AM
The rear brakes take a special tool to screw in the piston.
I use the cheap tool in this video. Make sure to just go to flush and line up the slots.
https://www.youtube.com/watch?v=4p6jjvULrP0
This explains it a bit better.
https://www.youtube.com/watch?v=hQfV0b75hgI
CraigS
02-10-2018, 07:32 AM
I assume they are the rears? Are they Wilwoods? If so read PhileasFoggs thread. He sent his calipers to Wilwood because he had actuated the park brake a few times.
slpro1207
02-10-2018, 09:37 AM
The rear brakes take a special tool to screw in the piston.]
Thank you. I have rebuilt calipers in the past. Long long time ago. No special tool required.
mike223
02-10-2018, 10:11 AM
Thank you. I have rebuilt calipers in the past. Long long time ago. No special tool required.
If you're working on a Ford rear caliper and the piston won't return with the bleeder screw removed...
You need a special tool.
https://www.youtube.com/watch?v=rlMU8K36Hjo
Big Blocker
02-10-2018, 10:32 PM
Having worked on thousands of FORD brake systems as a FORD mechanic, the rears need a special tool to "screw" the piston into the caliper bore BECAUSE of how the park brake functions.
I have this very affordable set that I bought on Amazon:
https://www.amazon.com/Caliper-Compression-Domestic-Vehicles-T1A-B1009/dp/B01LXWT282/ref=sr_1_2_sspa?ie=UTF8&qid=1518325828&sr=8-2-spons&keywords=disc+brake+caliper+tool&psc=1
It allows you to compress caliper pistons and "wind" the ones that require it.