Well thought changing the brakes was a easy thing to do till i needed to change the rear ones

How wrong was I

4 hours later so cant get the rear piston to push back

Found out need a special tool that pushes it back in then got the tool of a mate and still no joy

So maybe a new rear caliper

ANy idea anyone on the cost????

Do you realise that both pistons DONT wind in the same way ?

Nearside anti clockwise and offside clockwise i went over this in a thread somewhere

Im getting my mate to do a foreigner for my rear brakes- too much hassle

front ones are pish easy though

PNL said:

Do you realise that both pistons DONT wind in the same way ?

Nearside anti clockwise and offside clockwise i went over this in a thread somewhere

Click to expand...

Yeah i know I now have a tool but still no joy

Been working on the passenger side for ages Now given up for the day

Just need it back on the road tomoz even if it needs a new caliper as its in fiat on fri for a new rad

StiloJoe said:

Yeah i know I now have a tool but still no joy

Been working on the passenger side for ages Now given up for the day

Just need it back on the road tomoz even if it needs a new caliper as its in fiat on fri for a new rad

Click to expand...

I can understand your frustration Joe have you got a large G clamp and a pair of plumbers pipe grips if so take the caliper off its mounting and support it on the disc[cover the disc with something so you dont damage it] then with the G clamp tighten down on the piston a little and the with the grips turn the piston you do need to put some pressure on the piston for it to go in and then repeat the process again screw down with the G clamp and give the piston another turn anticlockwise and slowly but surely you will find it will retract, When its down make sure the piston is in the correct position for the pads to slot in, this is how I did mine just make sure if you do it this way you dont damage the rubber piston seal with the grips these pistons need a fair bit of pushing and don't just screw in easily try it you have nothing to lose.

The only problem I found with the passenger rear side caliper winding back with the way I did it is the G clamp winds clockwise and the piston anti clockwise so its a little fiddly I have been trying to get hold of a G clamp that winds anti clockwise like on the continent but havn't been able to source one if anyone know where I can get one please let me know its not that often we need to change our pads but winding the clamp and the piston the same way does help and saves considerable cost in buying the kit which includes both thrust bolts £90

I haven't done this job yet but it's obviously going to be easier with a proper fitting tool so if you have a break in betwen gasps Joe or if anyone has an old rear caliper lying around can you accurately measure the
outside diameter of the piston
diameter of the two holes in piston face
distance between centres of the two holes

Or measure the same on the tool if you have one
Then maybe I can make a detail drawiing and post it up so people can make their own tool. You only need it once in a purple moon but when you need it, you can't hang about

Deckchair5 said:

I haven't done this job yet but it's obviously going to be easier with a proper fitting tool so if you have a break in betwen gasps Joe or if anyone has an old rear caliper lying around can you accurately measure the
outside diameter of the piston
diameter of the two holes in piston face
distance between centres of the two holes

Or measure the same on the tool if you have one
Then maybe I can make a detail drawiing and post it up so people can make their own tool. You only need it once in a purple moon but when you need it, you can't hang about

Click to expand...

Decks if its a tool to fit the face of the piston you want then you will find that the spanner that comes with the small angle grinders the one thats used for tightening down the plate onto the disc that fits do you understand which spanner I mean mate ?

Yes i do. Think I have one knocking around. I intend to have something a bit chunkier than the Black and Decker graze your knuckles spanner though. The measurements would help me as I can get something made up first at our local steel merchants here before I need to try it for real, otherwise I'd have to take the pads out just to measure it

So I could do with outside dia of piston
Dia of holes
distance between holes
Depth of holes

View attachment STILO4.BMP

I have thought of a simple way of making a pair of piston retractors only if I could get hold of that G clamp with the opposite thread simply tack weld one of these thrust plates onto the bottom of the clamp and bingo push in and screw down in one [simple isnt it ]

Deckchair5 said:

I haven't done this job yet but it's obviously going to be easier with a proper fitting tool so if you have a break in betwen gasps Joe or if anyone has an old rear caliper lying around can you accurately measure the
outside diameter of the piston
diameter of the two holes in piston face
distance between centres of the two holes

Or measure the same on the tool if you have one
Then maybe I can make a detail drawiing and post it up so people can make their own tool. You only need it once in a purple moon but when you need it, you can't hang about

Click to expand...

Managed to do it (thank fudge)

Only seen the replys now Had a tool that is a cube shaped (wish taken a pic now) and it had diff fittings on each side with a square hole in the centre to put a bar into (bit like a socket) and it did it with not too big of a problem then

Im so glad i didnt need to buy a new caliper as they are £155 notes from fiat and they have to order them in

I will take pics when i come to change the pads properly as ive only put the old ones back in as i need the car running for 1st thing fri to get my rad.

But defo when i get to change them i will make a guide up cos trust me its hardier than i first thought (thinking they was the same as the fronts) How wrong was i

If anyone needs any help im willing to give advice on the matter

Glad you have sorted it and you have given me some infomation I wanted Re- the cube I knew they were available from companies like sealey for around £7 but never bought one thinking Nah it wont fit well now I know it does fit it makes my caliper tool making plan even easier @ Decks theres no need for the plate now you can buy a cube and screw away all day

PNL said:

Glad you have sorted it and you have given me some infomation I wanted Re- the cube I knew they were available from companies like sealey for around £7 but never bought one thinking Nah it wont fit well now I know it does fit it makes my caliper tool making plan even easier @ Decks theres no need for the plate now you can buy a cube and screw away all day

Click to expand...

Yeah after cutting my right hand open in various places and swearing at it and not sleepin last night all sorted

Will have to invest in a tool as all 4 vehicles on our drive are rear discs (Great )

EDIT:

This is the tool in question i used



From site:

http://www.etoolcart.com/index.asp?PageAction=VIEWPROD&ProdID=429

Hope that sheds some light on the situation

And here is a english site too

http://www.bennetts.com/tools/vehicleservice?contentId=26882

http://www.tooled-up.com/Product.as...nch-Square-Drive-Brake-Caliper-Wind-Back-Cube

Well done Stilo joe
I'm thinking that there's more turning force required than pushing in which is why people have trouble. After all, the piston moved out easily enough in very small movements at a time so it should go back in in the same fashion

The only tools I've seen are these





A "How to" guide would be much appreciated by all when you get back from the outpatients

As for "now you can buy a cube and screw away all day" I have my own special tool for that

It really isn't necessary to make / purchase special tools to do this job.

I use a G clamp and the tool for my angle grinder that removes the disc nut. The prongs fit into the recesses on the piston just perfect. Makes it sooo easy to retract them.

Stilo_ste said:

It really isn't necessary to make / purchase special tools to do this job.

I use a G clamp and the tool for my angle grinder that removes the disc nut. The prongs fit into the recesses on the piston just perfect. Makes it sooo easy to retract them.

Click to expand...

I wish i was you over the last few days cos im boooloxed lol

I found it really easy with the cube though as i didnt get on with the other tool But hey thatwas just me lol

Good stuff. Did you release the bleed nipple to allow the fluid out and make pushing in easier?

Deckchair5 said:

Good stuff. Did you release the bleed nipple to allow the fluid out and make pushing in easier?

Click to expand...

No mate as didnt fancy bleeding the bleeder after lol

Ah! You like a challenge. Go forward that man and take a medal out of the bucket

It's probably better not to release the nipple anyway, as the ejected fluid will need replacing with new, so the level doesn't drop too far as the pads wear down.