Quote:
Originally Posted by JSH
I was agreeing with you. JCC is wrong when he says drums went away because of ABS.
Drums went away on the front axle to increase braking power and reduce fading. Drums went away on the rear axle in wealthy countries due to marketing.
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Really?
Drums can lock any tire just as well as any disc, ie they have no less advantage in braking power. Actually, drums can lock up better then discs, because they have efficiencies with 'self-energizing" tendencies with dual shoe single cylinder activation. The downside is that that takes time because of mechanical action, and that is the enemy of good ABS solutions. Large Trucks have been on the back side of the road away from drums, mainly because of the disc technology has lagged with the great heat dissipation demands large trucks create. Nascar (heavy, high speeds repeated braking in some cases) had the same issue converting to discs that eventually was resolved. Discs also solve one other crucial performance aspect, that front discs solve, being they do approx 70% of the braking, resistance to water effects under braking, which if present on the rear creates a lot fewer problems than the front, ie they resist lock up, when wet, but are only tasked with 30% of the braking. Brake fade under normal driving conditions is rather rare, very unique and driver avoidable in most cases. ABS is a great safety feature useful at anytime when driving, with every driver.
Your marketing claim for OEM's primary switch to the use of rear discs in everyday cars is without merit, but you are welcome to prove me wrong. I would not argue OEM marketing exploited the rear disc upgrades, and it appears many here drank that Kool aid.
I guess we could also explore the various parking brake solutions of rear drums vs discs, but that maybe just getting into the weeds.