The Cessna 120-140 Association Forum

I couldnt find any info online so Im asking the experts. Is it acceptable to machine the rotors on my 140? They arent warped just have some mild grooving from use. Thanks for any help.

Do you have Clevelands? I had an issue years ago where my rotors had worn too thin and the brake piston would push out just too much from the brake housing, causing a few locked up brakes in the process. Clevelands have a table on minimum thickness' I can post if that's what you have.

Machining the rotors so that they are smooth might be just a temporary fix and you might take off more metal causing the discs to be too thin. I have changed discs and pads several times and the discs always seen to develop grooves. It is most likely caused by dirt, sand, etc. that gets between the pads and the disc. I would check the thickness, I believe that 1/4" is the minimum for Clevelands on the 140, but I could be wrong on that.

Yes I have Cleveland Brakes. A thickness chart would be helpful. I may just buy new discs since they are less than $100 each. Thanks for the info.

The 40-97A wheel assembly has the 164-02601 brake disc, which has a minimum thickness of .205". I can't seem to attach the Cleveland files on the website(too big? PDF files?). PM me and send along your e-mail address and I'll forward this stuff to you.