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Posted by: ahdoman Feb 16 2008, 07:35 PM

Hey all,
Getting ready to put my A type calipers back together. Got a couple of questions.
1) Is this the correct orientation of the dust seal (see seal on right)?
2) Is the retaining ring in the right place and does it matter where the two ends are (blue arrow) and should there be a small (1/8") gap?
3) What is the suggested orientation of the notch in the piston (green circle)?

Posted by: Eric_Shea Feb 16 2008, 07:42 PM

1. Yes
2. Doesn't Matter and yes.
3. Not there... Hard to explain. Look for pics in the rebuild kit. The notch should face into the oncoming rotor as it slices through the groove. Actual measurement should be 20 degrees off the opposing wall (where your blue arrow emanates from or, the other side). They are directional for left and right... got to get it right or you'll get plenty-o-squeal.

Let me go take a picture for you.

Posted by: Eric_Shea Feb 16 2008, 08:01 PM

OK... here's the piston orientation breakdown:

This picture shows the drivers side inner caliper 1/2. The rotor will be traveling in the direction of the arrow. Position it as such but, make sure it's the drivers side caliper 1/2. The bleeder will be at the top:



Here's the passengers side:



Understand this principle and apply it to the outer 1/2's. Then make sure you mate the proper pairs together.

I see another potential problem. Nice red paint (poser) In all seriousness, The area where the pads sit; it looks as though you guys did a great job cleaning these up and blasting them. Is that area protected? If that is simply bare metal then it will rust overnight. This is where your pads will sit. They will eventually rust in place, stick and squeal. That area needs to "really" be protected if it's not. I say really because it can get hot in there. Paint will flake etc...

Posted by: ahdoman Feb 16 2008, 08:38 PM

Thanks for the info Eric. In regards to the area where the pad will sit; How did they finish these from the factory? These were rusty and the pads were stuck in that gap. It's no big deal to media blast the paint back off (so far only the rear sides have been painted). If I get these zinc plated do I also do the pistons?

Posted by: Eric_Shea Feb 17 2008, 01:36 AM

It was cadnium plated at the factory. Cad is now almost verboden here in the States... especially Kalifornia. Zinc is the proper replacement and it will look almost identical when finished. Keep in mind, the factory finish on those may be 30 years old.

Don't plate the pistons. Polish their sides on a wheel and then use a heat paint (as the calipers will get hot etc.) such as POR15 Exhaust Manifold Grey or some of the muffler paints available.

Posted by: AgPete139 Feb 19 2008, 12:37 PM

You are saying to paint the piston walls? Or the backside to to pistons?

Posted by: Eric_Shea Feb 19 2008, 03:02 PM

Sorry... that was very unclear.

Polish the sides and paint the tops. You can see the top of the piston in the picture is painted.

"No" paint whatsoever inside the bore where the fluid will come in contact with it.