Caliper Angle

[7783911]

I am in the process of refreshing my calipers and for my life cant grasp the diagram in Bentley's for the correct orientation of the calipers. Is there a simple explanation of the orientation ..watching video I hear 6 and 1 o clock but that makes no sense to me

[ryans65]

I had to cut a template to get the angle right on mine, check out this thread:

https://forums.pelicanparts.com/porsche-911-technical-forum/284759-enlighten-me-brake-piston-angle.html

[Dpmulvan]

Not sure what you’re asking, I think you’re talking about the angle of the piston? If so just arrange piston so the ledge or center of the piston is slanted 20 degrees so the longer side of piston is at the trailing edge of rotor.

[Dpmulvan]

Either way it’s not that big of a deal as long as your in the ballpark.

[7783911]

I did use the template but to be honest wasnt convinced I was doing correctly :-)

DP..longer side to back of roror is a good hint if i did correct,,,thanks

[krd]

20 degrees. simply draw an imaginary line down the center of the pad cavity and place the bottom notch on this center line. Your pistons are already cut for the 20 degree angle so, if your bottom notch is in the center of the pad cavity, your top notch is set perfectly at 20 degrees.

[Bill Verburg]

[7783911]

DP, looking at the manual it looks like longer edge is leading edge of rotor? Now I am really confused

[917_Langheck]

Per Bill:



It looks like you have it correct:




(edit, you guys are too fast for me and my phone....)

[7783911]

Its not perfectly 20 degrees..does a couple of degrees matter?

[Zuffenwerker]

Always place the pistons to where the rotor rotates into the “cutout” of the piston. If you want to be exact the ate tools are available but it’s not critical, just have the normal driving direction of the rotor rotate into the cutout

[917_Langheck]

If you want to be accurate you can scale the drawing above on a printer to 1:1 and use it as a template. The 20° angle is correct in the drawing and the tool will fit the workspace.

[SCadaddle]

As the tutorial on the PMB website tells you, just place the lower of the two notches in the center of the inboard opening of the caliper and you're good to go.

[Walt Fricke]

Bill
Those drawings are great, but I am puzzled by the gray shaped piece's shape, and specifically by the location of the two holes depicted. On a caliper the retaining pins are on the outside, clear of the outer edge of the rotor, as shown in the orange caliper picture.

Also, have you figured out why Porsche/ATE chose 20 degrees? Does it have to do with the different mechanical advantage found at the outside of the rotor versus the inside?

[SCadaddle]

Don't you reckon the "2 holes depicted" in the illustrations are where the bolts mount the calipers to the hub assembly?

[SCadaddle]

Originally Posted by 7783911

917

I have a cardboard cut out (actual tool is delayed in mail from UK)

its the diagram that confused me re the angle but its done now based on all the input...had to confirm i wasn't backward...hope this picture makes sense..both calipers identical re notches at back of caliper

I don't think your boot retainer spring clips are in the correct position, will they not fit further up the piston bore? edit: well, the photo has now disappeared.

[7783911]

917

I have a cardboard cut out (actual tool is delayed in mail from UK)

its the diagram that confused me re the angle but its done now based on all the input...had to confirm i wasn't backward...hope this picture makes sense..both calipers identical re notches at back of caliper

[7783911]

The circlips are in the groove on the caliper body, from the bottom thats hard to see...unless I didnt get it right

[SCadaddle]

Ah ok that's right the inboard section of the caliper has a notch cut out of it in that area. I stand corrected.

[7783911]

Phew...I can not pull it apart again :-), only 3 more to go