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 Post subject: 356C brake caliper
PostPosted: Fri Jan 12, 2018 12:07 pm 
356 Fan

Joined: Tue Apr 12, 2011 5:24 pm
Posts: 1
I had taken my front and rear brake calipers apart to rebuild them for my 356C. I had an extremely hard time getting the pistons out but managed to blow them out eventually. I got the rebuilt kits but having a difficult time getting the pistons to go in. There's a "pin into sieve" in the back of the piston that seems to prevent the pistons to go into the caliper. Does anyone know how to reassemble them.
Thanks
Alan 8)


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 Post subject: Re: 356C brake caliper
PostPosted: Fri Jan 12, 2018 12:25 pm 
356 Fan

Joined: Fri Dec 03, 2010 7:42 am
Posts: 269
If you wish to retain the assembly that grabs the pin then put the pistons in with a big C-clamp.
If you don't want to retain the assembly that grabs the pin then put the pistons in with a lesser sized C-clamp or maybe you hands and fingers.
There have been discussions with much more detail about this in this talk list.
Make sure you get the rotational orientation of the pistons set per the service manual.


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 Post subject: Re: 356C brake caliper
PostPosted: Fri Jan 12, 2018 2:43 pm 
356 Fan
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Joined: Tue Mar 25, 2008 7:20 pm
Posts: 1232
Location: Metuchen, NJ
Do not leave out that assembly that grabs the pin! No one here has put more R&D into this system than the manufacturer back in the day. It's there for a reason! Some have left it out and reportedly haven't had a problem, but it is NOT recommended. Leave it in and let it do its job.

Put a small block of wood over the piston then use a c-clamp as mentioned. This will force it onto the pin at the back of the caliper. Make sure it goes in straight.

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Emil Wojcik
'64C Euro coupe


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 Post subject: Re: 356C brake caliper
PostPosted: Fri Jan 12, 2018 4:22 pm 
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Joined: Tue Oct 27, 2009 5:02 pm
Posts: 6260
Location: SE Michigan
And now to answer your next question.
"I've rebuilt my calipers and bled them twenty-five times and still don't have a good pedal!"
You will need to "exercise" the pistons. Once the brakes have been bled, pull one brake pad at a time, put in an old thin one and push the piston out; then back in; then out, etc; at least three times. You will notice an improvement with each piston. The square-cross-section O-ring needs to be seated properly, or it will keep pulling the piston back. The "pin-grabber" helps the piston to not get retracted too much upon brake release, but it can't work miracles. Yes, I use it in my race cars also.

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 Post subject: Re: 356C brake caliper
PostPosted: Fri Jan 12, 2018 10:01 pm 
356 Fan

Joined: Sun Apr 20, 2008 12:54 am
Posts: 2729
+1 Vic,

Dick


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 Post subject: Re: 356C brake caliper
PostPosted: Sat Jan 13, 2018 10:38 am 
356 Fan
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Joined: Tue Mar 25, 2008 6:05 pm
Posts: 218
Location: Grand Rapids, Michigan
I am rebuilding my calipers now, too. Lots more tips and photos in the following tech article, plus the two listed threads:

https://porsche356registry.org/article/153

http://forum.porsche356registry.org/viewtopic.php?f=1&t=33087

http://forum.porsche356registry.org/viewtopic.php?f=1&t=32880

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Bill Waite
Grand Rapids, MI

1965 356C Coupe


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