[Graham]

Easiest way to do this?



Graham

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[Dave]

Graham - You're a busy man! I had to use an old pad and a C-Clamp to GENTLY and SLOWLY press the pistons back into the bores on the M030 front calipers I just rebuilt. Make sure they go in dead straight, be REALLY patient, and it should work.



I lubed seals, pistons, bores with clean brake fluid. I must have taken 5+ minutes per side of the caliper (pair of pistons worked in together).



The write up on this says one may be able to press them in by hand, but I cannot imagine how.





http://vista.pca.org/sch/tech_articles/cal...per_rebuild.htm

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[BruceWard]

When I rebuilt my factory calipers I cleaned the pistons and bores until I was able to press them in by hand. When I started I could not remove many of them with a compressor and had difficulty even removing them with a tool I made to grab onto the ring the dust cover fits in and a hammer.



Are you trying to press them in while connected to the car to fit pads or are you rebuilding them. If they are attached to the brake line then they should be difficult to press in. A C clamp and a couple blocks of wood is a great tool for pressing them in.

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[Brian]

i just have standard brembo brakes.

let me tell you that i tore four piston seals pushing the pistons in with a c-clamp.

i got some silicone o-ring seal and lubed up the rubber seal. then the pistons slid in easy as can be.

highly recommend a little o-ring lube. don't go through all the hassle like i did only to tear those darn seals and leak brake fluid all over the place!!!



just my experience. hope it helps.

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[BruceWard]

Brian jogged my memory. I had a reassembly system of;



1. Place the seals in a tub of brake fluid so they can soak some up.



2. Place the pistons for the caliper to be assembled in a tub of brake fluid.



3. Install the seals inside of the caliper.



4. Make a ring of the caliper grease that came in the Porsche rebuild kits around the end of the pistons that will go in first. I have seen similar grease packets at automotive stores.



5. Push the pistons in by hand.



Then move on to the next caliper.

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[Graham]

The caliper is still on the car.



I accidently pressed the brake lever with no discs and one came out and a pad dropped out



It is only on one side.



They are newish calipers (year old)



I don't really want to strip the caliper if I can help it



I would prefer to just push them back in on the car if poss?



Graham

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[BruceWard]

No need to do anything to the caliper.



You may be able to push the piston back in by hand if you open the bleed valve. Brake fluid will come out as you push the piston in. Brake fluid eats paint so you do not want to get it on anything. If you have a motive power bleeder it will have a short tube you can place over the bleed valve and into a bottle. If not get some tube at a hardware store to use.



If it will not go in with your hand then a c clamp and blocks of wood to protect the piston and caliper body will do the trick. Although if the piston is out too far then you need to realign it in the bore. You may even be able to push it back in with a c clamp without opening the bleed valve.



If the piston is out too far then you need to realign it in the bore. Although I think fluid would be coming out if the piston was that far out.

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[Graham]

Thanks Bruce



fluid is not coming out and I don't think the piston is not too far out.



Are there two bleed valves on each side of a big red caliper (four per caliper- one at the top, one at the bottom for each pad)?



Or is it just the top one that I open?



Graham

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[BruceWard]

You can see the bleed valve in this picture







It is the thing right above the 10" mark on the ruler with a black cap on top. If it is the same as the stock 968 bleed valve you will need a 11mm line wrench or atleast a 6 point wrench to open it. Opening one bleed valve on the caliper should be sufficient to relieve pressure and allow the piston to be pushed back in.

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[Graham]

Thanks Bruce



Thought so, its pretty obvious really but I just like to double check when I am working on the car just to make sure there aren't any other weird complex procedures to follow.



I'll let you know how I get on



Graham

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[Dave]

Graham - Just to be clear... Did a piston come ALL the way out (into your hand) or just extended pretty far?



The reason I ask is that for pistons that are still in (seal is intact), it should be easier/simpler to press them back in. I usually just carefully pry such pistons back in with an old brake pad.



Just wondering.

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[Graham]

Dave



It has extended too far



It has not come out



Graham

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[Graham]

Job done thanks Guys



Graham

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