My single story house was built in 1955 on a slab. My stub outs are iron pipe. What kind of plumbing pipe is running through my slab, iron or copper? I always thought it was copper, but why the iron stub outs?The reason I ask is that I‘m going to change my angle stop valves and want to know if I need to apply much counter torque when I remove them from the 1/2 MIP stub.Thanks!!
About 70% of braking effort is done by front wheel. Dual disks are handy for front for long life and useful braking with light pressure on brake lever- remember most cars have power brake disc systems. You noted 'usually'- the single front rotor is common on the smaller under 500cc or so models yet, is all that is needed. Single rotor fork twist when brake applied? - minimal, old 750 Hondas with the single brake stopped straight. Disc pad wear and stopping when wet are facters that heavy motorcycles consider when going to dual disc setup- my Goldwing has dual rotor system, little 400 uses single, both can stop fairly quick and slide/lock front wheel if slowing in rain.
the iron could be sleeves to protect the copper. anytime you run pipe thru concrete or a wall or under something it should be sleeved
Best guess is that you have galvanized iron pipe under the slab. This was typical in the era your home was built. If it was only a sleeve, there would be another pipe inside of it.
by house built in 1957 has copper from where it comes threw the floor to the meter yours maybe copper with mip flanges to your Iron pipe
The purpose of two rotors is to dissipate heat better. You'll also notice that motorcycle rotors are typically vented, and increasingly wave (the outer edge of the rotor is a wave vs. just a round disk) all of these changes increase the surface area of the rotor. More surface area more heat released into the air on braking. Besides the number of rotors and pads, you also have to consider the size of the rotors. Frankly, most Motorcycle brakes are overkill for the type of riding (most stock bikes have adequate braking systems to be used on the track) - maybe its cheap enough to make the brakes on a bike much better than a car, and the safety benefit outweighs the cost anyway? Heat is generated from friction when the pads rub against the rotor when the brakes are applied. The more the bike weighs, the more heat will be generated when stopping. Smaller, lighter bikes may not generate as much heat when braking, so they only use one set of rotors in front. I don't know about Evo or Honda brakes. There are lots of reasons why the designers may feel one brake system is needed on a vehicle vs another. Besides the number and size of the pads, the size of disc, and the material are also considerations. If the brakes don't dissipate enough heat, you'll eventually wind up with warped rotors, and reduced brake life.
