Rear caliper rebuild

dede911 · 01-28-2010, 12:06 PM

Hi,

I'm rebuilding the rear calipers of my 1982 SC with Stainless pistons.

For the front calipers, I have a drawing in the Bentley manual where I can see how to install the pistons to get the correct 20° angle.

I found no instructions for the rear calipers.
How should I install the pistons to get the correct 20° angle on the cut out?

Thanks.

André

Eagledriver · 01-28-2010, 03:59 PM

I just "eyeballed" them. You can get within 5 degrees or so with just your eyes.

-Andy

Flieger · Flieger's Garage

Do a search on the forum for 20 degree tool or something like that.

Basically, you get a sheet of carboard and a protractor then trace a 20 degree angle with a pencil and cut it out using scissors. And there you go...

JJ 911SC · JJ 911SC's Garage

André

Check the Photos and Sktech in entry # 3 of this thread... 1988 911 Brake Caliper Rebuild Confusion

Salut

J.J.

dede911 · 01-29-2010, 07:42 AM

Hi,

Thanks for the replies.

Because English is not my native language, my question was not very clear.

I know how to fabricate and use the 20° template for the front brakes, but what to do for the rear brakes?

Should I just follow the direction on rotation, and where the disc enters the caliper, position the piston in the 20° position?

Or is it different?

Thanks,

André

tonythetarga · 01-29-2010, 07:53 AM

Quote:

Originally Posted by dede911

Should I just follow the direction on rotation, and where the disc enters the caliper, position the piston in the 20° position?

Correct.

Gunter · Gunter's Garage

Andre,
Are the calipers ATE or GIRLING?

ATE promotes the 20 deg set-up but I think GIRLING does not?

It also depends on the position of the caliper vs. rotation of the disc.

The 20 deg setting is intended to counter-act the clamping-force wanting to distort the pads into uneven wear.

dede911 · 01-29-2010, 03:02 PM

Hi,

My calipers are ATE.

Think I got the information I was looking for.

Tomorrow morning (in a few hours here in europe)it is rebuilding time.

Thanks a lot.

Regards,

André

JJ 911SC · JJ 911SC's Garage

Dédé

Keep us posted.

I order all the parts but Im a bit "gun shy" (pas trop sure de mes competence) to start the job.

Salut

J.J.