R4S initial bite when cold may not be as good as stock but when warmed up they will be superior. I also want to say I had speed bleeders for years and didn't have a problem but when I did my last brake service I had one fail and leave a huge pile of brake oil. A second one dripped a little bit as well. And these issues occured when they were threaded in tight. I don't know WTF happened, maybe debris got between the caliper and the seat of the speed bleeders. I went back to my standard brake screws and recruited my favorite helper.






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It's definitely noticeable over 13Ts.








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