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Just upgraded my 1997 sl600 brakes to 6/4 pod calipers rotors from a R230 SL63, did all modifications to fit. Bled the brakes and I have a peddle but it's not completely hard, it stops but it it gets soft. The rear calipers are not engaging all the way to make the complete pressure ( I put on stands and ran to see if it's working) I'm under the impression that my brake lines are not big enough or brake booster issue. I'm very mechanical and been working on cars my whole life, but this is new to me. Maybe I have to bleed brakes more or I do have an issue with old and new coming together, I'm sure someone has put these calipers on a R129, thanks