If they’re both setup properly the parking brake will lock up with either of the setups, not that you want to do that (quick way to end up in a ditch backwards or upside down). The problem with the stock full drum setup is that they regularly stop adjusting properly, so the shoes wear down slightly, then don’t adjust outwards like they’re supposed to, then the service brake wheel cylinder or the parking brake cable can’t pull the shoes out enough of a useful amount to get much grab out of them. This is why I can not fathom why so many people recommend keeping the drums. The discs are better in every way simply due to the drum in hat doing the parking brake job (and never really goes out of adjust) and then has a constantly extending caliper for the braking portion, which yes due to the combo valve, is not much brake at all (as it should be).What about the parking brake? Is it easier to lock up the rear tires using the parking brake with rear disk?
My guess on why so many recommend keeping the drums when a drum vs disc swap comes up, is probably due to those saying to do so already having disc and not really knowing how frustrating the drums can become. That or they don’t realize how bad their own drums are. You immediately lose pedal feel and gain a bunch of pedal travel when the drums stop adjusting and the shoes wear to the point where they have to actually move to hit the drum.
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