Diagnosing a warped disc

[rufusgti]

Hi
Porsche 944 S2 1990
I believe I must have a warped disc, I can feel and hear the brakes binding on an on/off rhythm while slowing to a stop. Feels awful.
What is the quickest way to find out which disc is warped. They all look fine, and I've tried feeling the surfaces and calipers to see if one is getting hotter after a drive but didn't give any clues.
I could take it to a garage but am trying to do as much as possible myself at the moment.

I'm wondering if there's a quick method I've not heard of.
Thanks

[rufusgti]

HustleRussell said:

Most likely that the root cause is a sticking caliper. Given that the pistons are supposed to float in the calipers, why would a warped disc cause the on/off sensation?

I wondered the same.
So what would I do with that, rebuild or replace. How easy is a rebuild job on a Caliper or are they just not worth trying to fix at home.

[rufusgti]

paintman said:

Providing the handbrake works by applying the pads to the disc & not the set of small brake shoes to the drum part (bell) of the rear discs on many vehicles including the 944......
http://www.pistonheads.com/gassing/topic.asp?t=791...
http://www.pelicanparts.com/techarticles/Porsche_9...

Edited by paintman on Wednesday 18th January 18:29

Fantastic find, thank you. Actually the handbrake isn't set right so this is another job I can do while checking the brakes. Although this can't be connected to my warp/seized brakes it's certainly a job that will benefit having that knowledge to work with.