Rear brake piston

[REVHE4D]

Guys Iam trying to change my disks and pads, but have one caliper off and can not wond back the piston, what am I missing?


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[Umai Naa!!]

What sort of tool are you using?

Sometimes you have to give the piston a bit of a push, before you can wind them in.

Also spray a small amount of lube on the piston dust boot where it runs on the piston, and ensure the hydraulic brake line is not kinked.

[Rebuild]

I used this on mine



IIRC, was reasonably tight to turn, took some effort and time
I actually ended up taking the caliper off the van and put it in a vice, as it was too hard to apply inward pressure and turn it with it still on the van

[Umai Naa!!]

You really need one that pushes the piston in as it turns.

[REVHE4D]

I worked out it had something to do with the handbrake spring, took the spring off the caliper and then the piston went back.
Then I had trouble with the front , took the wheel off and found out the two bolts are 9mm hex, I searched everywhere today for 9mm, had to buy a whole set from Bunnings just to get one. Supercheap Autobarn ect could not help.

Brakes are now done, took me all day and learned a little, I Bled the brakes while the engine was running, should I have done it while off? I just drove it around the block.
I ended up putting in TRW cotec ceramic pads, lets see if they last and produce less dust.

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[Sunny43.5]

I made a similar tool from an old socket has the two lugs after some grinding . What I then did was place the socket over the piston and then used a "G "clamp to put pressure on the socket while simultaneaously using a pair of vise grips on the socket to wind the piston back in , now not sure but I think form memory it winds back in in a different direction to what you expect like a reverse thread .

[Umai Naa!!]

I used one of these: Right Handed Brake Break Caliper Piston Rewind Tool Dual Pin Q5J4 | eBay

I've since modified the lugs slightly, so that it works with calipers that have smaller diameter pistons, such as Golfs, etc.

[LogicprObe]

The first time I did the rears, I didn't have the proper tool and ended up using a pair of pointy nosed pliers.
You shouldn't have to bleed the system though unless you're changing the brake fluid.

[jets]

I used one of these: Right Handed Brake Break Caliper Piston Rewind Tool Dual Pin Q5J4 | eBay

I purchased a complete kit [31 parts in a case] from an Aust. seller for from memory $26 that had 2 wind in tools, one RH & the other LH.
It's just not worth making & modifying tools when they are so cheap. On my Golf I found the LHS piston had stuck causing premature wear on the pad. While the piston is extended, I clean the outside dust seal with an old tooth brush & water & dry with compressed air. I carefully fold it back & try & turn the piston while applying a small amount of brake assy. lube before winding it back in.

[Umai Naa!!]

I'd buy a full kit, but the likelihood of using everything in it, is pretty slim. Plus it's more to drag around everywhere.

With the premature rear brake wear on the MK5s, there was an issue on the early ones where the suspension movement would pull tension on the handbrake cables, causing a small amount of drag.