arz
10-26-2007, 10:31 PM
Ever since I have offered these brakes people have asked will these fit under wheel "X"?
It was a very complicated question to answer over the phone. I needed to make sure they understood what "Caliper Overhang" was. Then I needed to make sure they understood what "Radial Clearance" was. Then I needed to make sure they knew how to measure to the center accurately. Each person has a different idea how centered a portrait is when hanging in their living room. I have witnessed this same subjectivity while trying to estimate the "CENTER" of something being measured, especially when it was round.
Until now I never had a good way to tell them if they would 100% fit.
I have created a few templates that clear the 4 piston 13 in front and 6 piston 13 in front kits, and now the 14.25 in 6 piston kit. I will follow up with the rear kits shortly.
You download the full resolution photo. Then scale the print until it is one to one scale, easiest way to do this is to measure the 10 inch distance. That makes it easy to factor in how much bigger to make it. Once you get it correct you trim it out and fit it inside your wheel.
1. Download this 6 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/Brake_template_6_piston_13_inch.jpg) for the 6 piston calipers on 13 inch rotors so you can print it full scale/resolution.
OR
Download this 4 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_13_inch/4_Piston_13in_Brake_template.jpg) for the 4 piston 13 inch brakes
OR
Download this 14.25 inch 6 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6pot_14_in/Web_photos/14.25_Brake_template_resize.jpg)
I did my best to get it to get the size to be as close to 100% as possible. You might have the best luck resizing it on your photo software or changing your print boundaries to be as big as possible. There are plenty of horizontal and vertical dimensions, make sure the scale is accurate in both dimensions, if all else fails you can always redraw the entire sketch, since all of the dimensions are there.
2. Check the scale against a known tape measure, dial/digital calipers, engineers scale. Keep messing with the scale on the printer until its as accurate as possible.
Like this below.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2458_resize.JPG
Print 2 of them once you get it right, just in case you mess it up while triming.
Here is what the 4 piston image looks like
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_13_inch/4_Piston_13in_Brake_template_resize.jpg
glue the correct scale drawing to some card board. Preferably thin like the backing of a note pad or double the thickness of cereal box cardboard.
Measure the inside of your wheel to make sure if your center hole is bigger than 60mm. If it is make sure you match and center it. Mine was 67mm take a look
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2448_resize.JPG
I split the difference about the centerline, see below.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2449_resize.JPG
I took this piece of cardboard and left a bent edge to give the cardboard some rigidity after it was trimmed.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2445_resize.JPG
I traced the shape and cut it out, I left a few millimeters around the edge just to make sure. If it cleared the cut out by a few millimeters it would clear the brakes too. I also cut out the inverse shape to install on the car to make sure it cleared the caliper in real life, see the video below.
Watch the video here (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2444.AVI)
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2450_resize.JPG
Next I fit it in the wheel to see how close it was.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2451_resize.JPG
Yeah!!! Plenty of room, as a general rule I recommend at least 3mm clearance, but I do have some local customers that have less than 2mm and have never had an issue.
As another side note, I have disassembled at least a dozen front hubs, all had perfect looking grease and didn't need any service. If you don't need new bearings, don't mess with them, they last quite a while. I have had more than one customer call me after their fresh brake install, that rubbed, and it was always due to the newly installed wheel bearings not being properly tightened.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2452_resize.JPG
It was a very complicated question to answer over the phone. I needed to make sure they understood what "Caliper Overhang" was. Then I needed to make sure they understood what "Radial Clearance" was. Then I needed to make sure they knew how to measure to the center accurately. Each person has a different idea how centered a portrait is when hanging in their living room. I have witnessed this same subjectivity while trying to estimate the "CENTER" of something being measured, especially when it was round.
Until now I never had a good way to tell them if they would 100% fit.
I have created a few templates that clear the 4 piston 13 in front and 6 piston 13 in front kits, and now the 14.25 in 6 piston kit. I will follow up with the rear kits shortly.
You download the full resolution photo. Then scale the print until it is one to one scale, easiest way to do this is to measure the 10 inch distance. That makes it easy to factor in how much bigger to make it. Once you get it correct you trim it out and fit it inside your wheel.
1. Download this 6 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/Brake_template_6_piston_13_inch.jpg) for the 6 piston calipers on 13 inch rotors so you can print it full scale/resolution.
OR
Download this 4 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_13_inch/4_Piston_13in_Brake_template.jpg) for the 4 piston 13 inch brakes
OR
Download this 14.25 inch 6 piston template (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6pot_14_in/Web_photos/14.25_Brake_template_resize.jpg)
I did my best to get it to get the size to be as close to 100% as possible. You might have the best luck resizing it on your photo software or changing your print boundaries to be as big as possible. There are plenty of horizontal and vertical dimensions, make sure the scale is accurate in both dimensions, if all else fails you can always redraw the entire sketch, since all of the dimensions are there.
2. Check the scale against a known tape measure, dial/digital calipers, engineers scale. Keep messing with the scale on the printer until its as accurate as possible.
Like this below.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2458_resize.JPG
Print 2 of them once you get it right, just in case you mess it up while triming.
Here is what the 4 piston image looks like
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_13_inch/4_Piston_13in_Brake_template_resize.jpg
glue the correct scale drawing to some card board. Preferably thin like the backing of a note pad or double the thickness of cereal box cardboard.
Measure the inside of your wheel to make sure if your center hole is bigger than 60mm. If it is make sure you match and center it. Mine was 67mm take a look
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2448_resize.JPG
I split the difference about the centerline, see below.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2449_resize.JPG
I took this piece of cardboard and left a bent edge to give the cardboard some rigidity after it was trimmed.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2445_resize.JPG
I traced the shape and cut it out, I left a few millimeters around the edge just to make sure. If it cleared the cut out by a few millimeters it would clear the brakes too. I also cut out the inverse shape to install on the car to make sure it cleared the caliper in real life, see the video below.
Watch the video here (http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2444.AVI)
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2450_resize.JPG
Next I fit it in the wheel to see how close it was.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2451_resize.JPG
Yeah!!! Plenty of room, as a general rule I recommend at least 3mm clearance, but I do have some local customers that have less than 2mm and have never had an issue.
As another side note, I have disassembled at least a dozen front hubs, all had perfect looking grease and didn't need any service. If you don't need new bearings, don't mess with them, they last quite a while. I have had more than one customer call me after their fresh brake install, that rubbed, and it was always due to the newly installed wheel bearings not being properly tightened.
http://www.arizonaperformance.com/parts_photos/Brakes_Front_MK3_6_piston/CIMG2452_resize.JPG