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Car guys, brake ??
Grand youngin' was given a '93 Bronco (POC) but the brakes are in question. The pedal goes to the floor before they engage, and you can hear air leaking from the pedal area. I'm thinking brake booster/master cyl. Tried bleeding the brakes but no go.
Sounds like you're on the right track to me.
Life member of the American Legion, the VFW, the NRA and the Masonic Lodge, retired LEO
That would work, he wears 13's!!
Vac line, most likely on the Bronc.
He probably needs a complete brake overhaul. Replace the booster and master cylinder (rebuilt ones come together) and inspect all the brake lines for leaks, and the wheel cylinders and calipers for free movement, leaks, etc. Don't forget to check out the flex lines front and rear.
People who bet their lives on cheap brake work would probably draw to an inside straight! The very best brake repair is just barely good enough!
I can't comment regarding the metallurgy of cheaper rotors, but I can confirm they are usually MUCH thinner than OE replacements, one brand I can't recall being only about. 012" over the 'minimum' spec for a vehicle being worked on.
I call it "getting exactly what you paid for". Frankly, I use the cheaper rotors on my stuff, but then I also don't consider machining the rotors when they warp...I just put new ones on. Things are simpler that way. YMMV.
Seriously though, if a rotor has warped once, making it thinner is only going to make it more susceptible to warping in the future. Less metal = less ability to handle heat. Even a 'slightly' warped rotor is too far gone in my opinion. Again, YMMV.