Davec30

iTrader: (2)

I bought a second hand set of 4 pots with a plan to refurb them with new pistons and seals however there is one piston on each caliper that won't move and it is almost right down to the bottom.

I don't have access to compressed air so does anyone have any idea how I can get the seized pistons out or if there is anywhere in the Glasgow area I can take them to get the pistons removed?

I know I could send them to Godspeed but I don't really won't to spend another 200 and odd quid on them.

Thanks in advance

scooby1994

iTrader: (2)

I put mine in a vice, sprayed release agent on it and gripped it with a pipe wrench and just kept working it till it came out,you have to get a new piston anyway so it doesn't matter if you damage the piston

Turbotits

iTrader: (2)

The way to do them. Although pain in the a**e in this case, is to connect them to the braking system. Clamp the good piston and pump the pedal to force the seized piston out.

wiggy1

iTrader: (7)

Try west of Scotland engineering there down off the Clyde express way somewhere I know they do brake calipers as they did my mates brembo a for him

Davec30

iTrader: (2)

I did think of that but it will be a pain in the ***!

I've been spaying with wd40 and trying with a pipe wrench! Looks like I'll have to get someone with a vice!

360ste

iTrader: (1)

Agree with turbobits, but could be worth spraying into caliper with WD40 for a few days to try nd loosen things up a bit.

kevo10

Try a good penetrating oil instead ,like plus gas ,as it works better

Kwik

iTrader: (10)

You can use a grease gun, it means you will have to clean them repeatedly when done. you'll also have to improvise with clamps etc to stop the other 3 pistons. Using a pipe wrench will mark/scratch the surface of the piston.

Davec30

iTrader: (2)

Thanks for that. It's only one on each caliper which is a pain!!

Davec30

iTrader: (2)

I had a look at the grease gun method on YouTube but looks very messy!!

I'm going to order s/s pistons so not too bothered if I mark the one that's seized as long as I get it out.

Where's the best place to get plus gas?

Kwik

iTrader: (10)

In which case pipe wrench and twist as you pull.

5cooby1

iTrader: (18)

Would a petrol station air machine do it if you put a really high psi?

Kwik

iTrader: (10)

No, and I'd imagine the petrol station would also get the hump as they come under some force and make a "pop".

5cooby1

iTrader: (18)

Lol if it would of worked I would go later at night. Lol

Firez34

iTrader: (5)

As above clamp them and just pump the bad one/s out.

Gavscooby1

Get some freeze and release from Loctite around £5

Fudgey

iTrader: (1)

a few years ago i had the same issue and got my old man to tap the inside of the piston and then got a fecking big bolt and screwed that in, then bolt in vice and tap the calliper off.

i then just cleaned up the piston as it was ok, just seized in the seal and i was fitting new seals etc anyway.

saves destroying the pistons!

Davec30

iTrader: (2)

I've used wd40 and a silicon lubricant but still no movement. I'll try the freeze and release tomorrow if I can get it locally.

Thanks

Fudgey

iTrader: (1)

another option is leave them in a bucket of diesel, as that can penetrate.

have you stripped the callipers down at all?

if not, then it may be a good idea so you can get some lube in there

Davec30

iTrader: (2)

Yes, I've got the dust seals off all the pistons just not took the other pistons out yet.

Godspeed Brakes

iTrader: (259)

The easiest way to get the pistons out is hydraulically with the brake pedal , you have to clamp the free moving pistons so the pressure is going to the stuck one , the next best way is compressed air , but sometimes even 150psi is not enough.

I have made up a hydraulic pump on the work bench to remove stuck pistons , we never fail to get them out with this.

If you have no access to either of the above , it will be brute force and ignorance that gets them out , along with blood sweat tears and plenty of swearing lol.

Thats why most send them to us in exchange for nice new shiny ones

Cheers Ian

Davec30

iTrader: (2)

Thanks Ian,

I would have sent my original ones but as per my pm the other week, I have one caliper with the imbosed sign and the other is the newer style with the sticker sign( previous owner mod!!!)

I purchased a set from eBay for £100 (sticker style) and am going to order your refurb set....If I can get the stuck ones out!!

Davec30

iTrader: (2)

Just a quick update.

I finally got the pistons out by biting the bullet and connecting them upto the car. They are now finished

http://s1321.photobucket.com/user/si...tml?sort=3&o=0

5cooby1

iTrader: (18)

They look awesome mate was it easy rebuilding the pistons?

Fudgey

iTrader: (1)

Nice one mate.

5cooby1, they are pretty simple to do if your handy with the spanners.

Davec30

iTrader: (2)

Yes, as said they are pretty easy. It only took about 10 minutes to put the new seals and pistons in. The hard part was getting the seized ones out!!

Davec30

iTrader: (2)

Oh and thanks, I'm very happy with them!!

5cooby1

iTrader: (18)

Thanks above will look into this for mine I think

Davec30

iTrader: (2)

I just took one wheel off and done both at that side.