CTS V caliper HELP

[L13Jameson]

Finishing up CTS V 6 piston brembo install everything went smoothly until I got to the passenger side front caliper. I tried to torque the brake line banjo bolt down to 36 Lb-ft as I've read the torque value to be and it stripped the caliper. It torqued fine to 20 lb-ft but stripped when I went to just 30 lb-ft. Thought it was something I did and ordered a replacement caliper. Went to install new caliper today and was super slow and careful. Low and behold the banjo bolt stripped AGAIN. The other 3 calipers torqued to 36 lb-ft easily.

[LDM]

I'm not sure how different the 6 piston CTS-V brakes would be from the 4 piston GXP calipers, but the G8 service manual says the banjo bolt torque should be 35 N-m, which is 26 lb-ft. Maybe you just got lucky on the first three.

[Eidolon]

Len is on the money. Banjo bolts don't need to be that tight because while pressure in the brake calipers is high, pressure in the brake *lines* isn't. So don't worry about the figure seeming low.

Sent from my Galaxy Nexus using Tapatalk 2

[L13Jameson]

I was going off LSX G8's install http://forum.grrrr8.net/showthread.php?t=30684 I was going with his torque values given that he is a service manager at GM.

[Eidolon]

I've got 35 Nm or 25 lb-ft in the Factory Service Manual for the front banjo bolts on the GXP 4-piston calipers. I can scan the page, if you'd like. Same values I use for my 6-piston fronts and 4-piston rears, and I track my car at VIR. So... I'm willing to bet his torque values are unfortunately a little high.

[LDM]

As said, the values I posted came straight from the GM service manual.

http://i843.photobucket.com/albums/zz352/lenmartin23/G8/Diagrams/BrakeSpecs.jpg

[L13Jameson]

Sucks that after 8 pages of people commenting on his post both here anfpd on the other board that nobody gave concerns that his torque values might be to high.

[L13Jameson]

Thank you for the correct values. Now to figure out how to fix this.

[Eidolon]

Sucks that after 8 pages of people commenting on his post both here anfpd on the other board that nobody gave concerns that his torque values might be to high.

Thank you for the correct values. Now to figure out how to fix this.
Yeah, sorry about that, man. :( Good luck.


As said, the values I posted came straight from the GM service manual.
... Now that's funny. Hop over to page 5-74. It says 35/25 there for the GXP caliper. :) So apparently they couldn't decide if 35 N-M is 25 or 26 lb-ft.

EDIT: Pic below, for simplicity.

http://www.eidolways.com/images/G8/random/BanjoTorque.jpg

[STL_G8GT]

Good luck dude... that sucks!!!

[LDM]

Sucks that after 8 pages of people commenting on his post both here anfpd on the other board that nobody gave concerns that his torque values might be to high.

Thank you for the correct values. Now to figure out how to fix this.
I hadn't even looked at the torque values in his post.



... Now that's funny. Hop over to page 5-74. It says 35/25 there for the GXP caliper. :) So apparently they couldn't decide if 35 N-M is 25 or 26 lb-ft.

Yeah I had already noticed that. It says the same on 5-71 for the GT caliper. 35 N-m is actually 25.8 lb-ft.

[Crazy Paul]

I was going off LSX G8's install http://forum.grrrr8.net/showthread.php?t=30684 I was going with his torque values given that he is a service manager at GM.

I've got 35 Nm or 25 lb-ft in the Factory Service Manual for the front banjo bolts on the GXP 4-piston calipers. So... I'm willing to bet his torque values are unfortunately a little high.

Easy enough trap to fall into.
I just looked at 2009 CTS brake torque specs and it does show 36 lb-ft for the front brake banjo.
Seems like the base model CTS may have had iron calipers on the front & the only torque figure given for the banjo assumes it's going into an iron casting.
You'd definately need to find torque specs that were specific to having cast aluminium Brembo calipers.

[LSX G8]

Well before we point a finger, or flame war at the "service manger at GM" here is right from SI and as you can tell there is not a specific RPO qualifier after the description meaning it covers all bases.

Service Information

2012 Cadillac CTS | CTS VIN D Service Manual | Brakes | Disc Brakes | Specifications | Document ID: 2165889
Fastener Tightening Specifications


Application


Specification


Metric


English


Brake Caliper Bleeder Valve- Front (All)


14 N·m


124 lb in


Brake Caliper Bleeder Valve- Rear (All)


13 N·m


115 lb in


Brake Caliper Bolt- Front (J56)


175 N·m


129 lb ft


Brake Caliper Bolt- Rear (J56)


130 N·m


96 lb ft


Brake Caliper Bracket Bolt- Front (JE5, J55)


230 N·m


170 lb ft


Brake Caliper Bracket Bolt- Rear (JE5, J55)


135 N·m


100 lb ft


Brake Caliper Bridge Pin Bolt- (J56)


33 N·m


24 lb ft


Brake Caliper Pin Bolt- Front (JE5, J55)


63 N·m


46 lb ft


Brake Caliper Pin Bolt- Rear (JE5, J55)


60 N·m


44 lb ft


Brake Hose Fitting Bolt- Front and Rear


49 N·m


36 lb ft


Brake Rotor Screw- Front


14 N·m


124 lb in


Brake Rotor Screw- Rear


12 N·m


106 lb in

[2lazy4agoodname]

I had the same problem as the op yesterday. I was installing my 4 piston calipers and the passenger side banjo bolt snapped it half. My car is now sitting in front of my house with no brakes as i cannot find the part number for the bolt. Any help?

[matthewo]

I have worked with a ton of aluminum and usually now I just go by feel. Except for high torque applications. Never had a problem going by feel. Aka good n tight.

But then again I had a job building aluminum parts

[Blown396]

Well before we point a finger, or flame war at the "service manger at GM" here is right from SI and as you can tell there is not a specific RPO qualifier after the description meaning it covers all bases.

Service Information

2012 Cadillac CTS | CTS VIN D Service Manual | Brakes | Disc Brakes | Specifications | Document ID: 2165889
Fastener Tightening Specifications


Application


Specification


Metric


English


Brake Caliper Bleeder Valve- Front (All)


14 N·m


124 lb in


Brake Caliper Bleeder Valve- Rear (All)


13 N·m


115 lb in


Brake Caliper Bolt- Front (J56)


175 N·m


129 lb ft


Brake Caliper Bolt- Rear (J56)


130 N·m


96 lb ft


Brake Caliper Bracket Bolt- Front (JE5, J55)


230 N·m


170 lb ft


Brake Caliper Bracket Bolt- Rear (JE5, J55)


135 N·m


100 lb ft


Brake Caliper Bridge Pin Bolt- (J56)


33 N·m


24 lb ft


Brake Caliper Pin Bolt- Front (JE5, J55)


63 N·m


46 lb ft


Brake Caliper Pin Bolt- Rear (JE5, J55)


60 N·m


44 lb ft


Brake Hose Fitting Bolt- Front and Rear


49 N·m


36 lb ft


Brake Rotor Screw- Front


14 N·m


124 lb in


Brake Rotor Screw- Rear


12 N·m


106 lb in


Isnt VIN D for a V6 CTS? Cast Iron Brakes?

2009-2012 CTS-V is VIN P


CADILLAC
CTS-V - V8 376 6.2L F.I. SC (VIN P)
2009-2013

[LSX G8]

Look in the specs, you go off the RPO code.... "D" is the body code, aka 4th Digit on cars, and 5th on trucks