JAG IRS brake shudder

[ollykiwi3]

"Did not feel it in the pedal just vehicle shudder with the rotor contamination problem. I did change to a different pad material when I switched rotors though, used carbotech pads. The stick slip occurs at a constant pressure so pedal does not pulse. You could actually see where pad material was unevenly deposited on the rotor in my case because there were dark and light spots. You can usually feel thick thin wear in the pedal so you are right that probably isn't it. "

Do you recall what kind of speed it was happening? heavy load, or light braking like mine?
thanks again for your insight. where did you get the carbotech pads? what country are you in. here in NZ we are very limited to choice.

Tom- jag lovers was my next move. I heard it can be a pain to adjust these things, correctly. I have mine set so it takes one click to just get a feel of drag on the calipers. I will have to look at the brass tensioners and see what they look like. I do recall one being a bit bent.i only ever adjust the cable length as the calipers are self adjusting, and it is all working fine.although that's one hell of a complex set up.

does anyone else have a measurement for the return springs? in the relaxed state.
thanks again.

[Cobra #3170]

Originally Posted by ollykiwi3

"Did not feel it in the pedal just vehicle shudder with the rotor contamination problem. I did change to a different pad material when I switched rotors though, used carbotech pads. The stick slip occurs at a constant pressure so pedal does not pulse. You could actually see where pad material was unevenly deposited on the rotor in my case because there were dark and light spots. You can usually feel thick thin wear in the pedal so you are right that probably isn't it. "

Do you recall what kind of speed it was happening? heavy load, or light braking like mine?
thanks again for your insight. where did you get the carbotech pads? what country are you in. here in NZ we are very limited to choice.

Tom- jag lovers was my next move. I heard it can be a pain to adjust these things, correctly. I have mine set so it takes one click to just get a feel of drag on the calipers. I will have to look at the brass tensioners and see what they look like. I do recall one being a bit bent.i only ever adjust the cable length as the calipers are self adjusting, and it is all working fine.although that's one hell of a complex set up.

does anyone else have a measurement for the return springs? in the relaxed state.
thanks again.

I am in the US and Carbotech is a US company I used their AX6 compound. I think any mildly aggressive compound would work and yes it was under light pedal pressure. You could also try sanding the rotors with an orbital sander and 80 grit paper to remove the old pad material and see if that makes a difference.
If it were me, I would sand the rotors as described above and put in new pads (what ever you can get) and then break them in following manufacturers recommendations. Multiple stops from a specified mph in a row then cooling then repeat for several cycles then drive with no brake application to cool to ambient temperature and then what ever else they recommend to complete the break in and get an even level of the new pad material transferred to the sanded rotors. If that doesn't work I have no other idea's

[ollykiwi3]

Thanks for the info.
Am going to a mates place to put car on hoist and run it up so I can see from underneath while running.

I just rebled the brakes and went for a drive.

I tried the handbrake only today and all was Quiet.i checked with main brakes at the same time and it chattered. So definitely not handbrake issue.yes I still need to look at that wear problem separately anyway.

Just another thing to throw in the mix,and it's something I was wondering about.
I found the stub axle splines with some wear and was wondering about spline backlash chatter.
I did find today that while driving steady at 20mph with light brake load on I could get the chatter fairly consistent BUT only going downhill or off load coasting. Not going up hil or while slight acceleration. And that seemed fairly repeatable.
Has anyone experienced spline wear like this creating problems?