Technical RR brake caliper piston stuck

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Technical RR brake caliper piston stuck

Dilirium

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I am repalcing the rear discs and pads atm of my 150JTDM Bravo but the rear right caliper is stuck. I am using the special tool but I can get no movement at all. Removed handbrake cable and brakfluid cap of the reservoir.
Am I overlooking something or are changes high the caliper is gone?
Never done this on the new bravo before so i am not sure how much force is needed normally to push the piston back in.


Suggestions appreciated
 
the piston might be a little crooked and binding in the hole ( if the discs and pads were really used this is even more probable)

don't push to much better insist on the rotation.. either in or out.. it doesn't really matter until you get it going... you could also push a very small force on the pedal to get the piston moving out ( be careful not to throw the piston out)
 
When you say rear right, it depends what end of the car your looking at.

If your standing at the back of the car.....

The off side is a right handed thread and a rewind tool is needed.

The near side is left handed thread. Its a complete PITA to rewind in with the rewind tool as you need to twist it left and push at the same time.

Ive only got a right handed thread rewind tool, what i found worked was twisting left and pushing on the piston and then took up the slack by twisting the part that goes up and down the thread and then locking it in place to stop the piston twisting back out.

Its hard to explain but if you got a rewind tool you will figure it out
 
I can agree they're a pain in the bum at the back. When I did mine I only had the clockwise tool for Pistons which worked for the drivers side rear absolutely fine.

However the passenger side rotated the other way. I had to use brute force. A lot of foul language and a few scraped knuckles as sacrifice to get them In

Quick tip, they wind the way the wheel would turn if you're going forward. :)
 
Thanks all but it worked out eventually. Dull thing is that the special tools were Sh*t in my case. I had to take the calipers off and put them in a vice. After a few taps with a hammer I could turn the pistons back by hand very easily while before I have bent the lever of the special tool. Also tapped them with a hammer while connected to the brake lines but no movement at all.
Looks like the pistons were to far out and a bit "tipped over" in the piston housing or backpressure from brakefluid was too high. The latter would be strange because reservoir cap was off.


But glad it worked out eventually.
 
I can agree they're a pain in the bum at the back. When I did mine I only had the clockwise tool for Pistons which worked for the drivers side rear absolutely fine.

However the passenger side rotated the other way. I had to use brute force. A lot of foul language and a few scraped knuckles as sacrifice to get them In

Quick tip, they wind the way the wheel would turn if you're going forward. :)

Always turn clockwise to retract the piston...on both left and right wheels.
Anticlockwise will engage the piston to come forward.
I used a long nose pliers to turn the piston back, while the caliper was positioned firmly against the car body wheel arch so that the force of my arm got the greatest impact ...to retract the piston.
The pistons do understand some choice words?
 
I can agree they're a pain in the bum at the back. When I did mine I only had the clockwise tool for Pistons which worked for the drivers side rear absolutely fine.

However the passenger side rotated the other way. I had to use brute force. A lot of foul language and a few scraped knuckles as sacrifice to get them In

Quick tip, they wind the way the wheel would turn if you're going forward. :)

A set of tools on ebay as less than £20 and does make the job straight forward. Ferodo calipers as supplied to Fiat can be has from a local Ferodo commercial brake centre at a very decent price so if necessary you might try that route. I got a local address from Ferodo.com and they didnt seem too bothered about making much of a profit from the odd retail sale. More interested in helping me!
 
Always turn clockwise to retract the piston...on both left and right wheels.
Anticlockwise will engage the piston to come forward.
I used a long nose pliers to turn the piston back, while the caliper was positioned firmly against the car body wheel arch so that the force of my arm got the greatest impact ...to retract the piston.
The pistons do understand some choice words?

That isn't true, the Bravo rear calipers go both in, in the direction of the car going forward, most Fiats are like this. The only time in would be different is if the caliper has been replaced with the wrong sided one.
 
That isn't true, the Bravo rear calipers go both in, in the direction of the car going forward, most Fiats are like this. The only time in would be different is if the caliper has been replaced with the wrong sided one.
The truth is that i did try the suggestion of turning the piston anticlock wise (as per the wheel motion) and suffered the consequences of the piston withdrawing rather than retracting on my Fiat Panda - this is on both rear wheels.
If the calipers were "incorrectly" fitted at the factory, then my post is intended to warn readers to be cautious!
 
What is the problem if the piston withdrawing? This happens too me often when I do this, then I know I took the wrong rewinding tool, I just take the other and the piston retracting instead.
 
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