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F-ONE · 08-17-2021, 01:01 PM

It has both. Mechanical advance and a vacuum brake. My understanding is the vacuum brake is not really "vacuum advance" but it's a "buffer"...so to speak that works with the mechanical advance in this model.

08-17-2021, 01:01 PM	#3
F-ONE Member Join Date: Aug 2020 Location: Heart of Dixie ( Alabama) Posts: 63	Re: Help with old Mallory zb 275 It has both. Mechanical advance and a vacuum brake. My understanding is the vacuum brake is not really "vacuum advance" but it's a "buffer"...so to speak that works with the mechanical advance in this model.