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Join Date: Jun 2008
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924/944 parts question

Are the brakes on a 924 the same as the 944 or are they different. I know this is probably a dumb question but I need to know for a project and found a 924 parts car
Thank you for your time
zak
Old 12-28-2008, 11:13 PM
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Location: Peoria, IL
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short answer - no they are not the same

unless the 924 is a 924S or maybe a 924 turbo (big maybe)
or if the 924 has had the brakes converted to the 944 brakes.
it is easy to tell by counting the lug nuts. four lugs on the 924 and five lugs on the 944.

good luck
Old 12-29-2008, 05:53 AM
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Well, it all depends. First of all, what 924 are you asking about: the early 2.0L platform (76-85) or the later 924S 2.5L platform (86-88)?

First, the easy answer: the brakes on the 86-88 2.5L 924S are essentially identical to those on 1985.5 and earlier 944s.

As for the 2.0L platform, it's a bit more complicated. Prior to 1979, ALL 924's came with the so-called 4-lug suspension, which was front discs with rear drums. These parts are NOT interchangeable with ANY of the 944 stuff unless you perform a "5-lug conversion" (more on that below). Beginning with the introduction of the 924 Turbo (a.k.a. 931) in 1979, Porsche made a 4-wheel disc 5-lug brake setup available as an option that could be ordered on both the 931 and the NA version of the car. Not many of the 79-80 NA's came with it, but there are a few of them out there. In 1981, with the "Series II" 931, all 931's came standard with this setup, and it was also included in the M471 suspension package and could be ordered on the NA's as well. So you will occasionally find 81-onward NA's with a 5-lug setup.

In terms of the calipers and rotors, these early setups were essentially the foundation that was carried over to the 944 in 1983, although there are minor differences between the rear caliper carrier on the steel trailing arm, and also purportedly in the piston sizes in the calipers. The master cylinders all have identical piston bores, and are all stepped, although the port arrangement and backup light switch arrangements varied. But, for all intents and purposes, the early 924 5-lug setup is pretty much completely interchangeable with the 944 stuff up through 1985.5.

Now, if you REALLY want to get into the details and explore your options for upgrades, let me suggest that you take a look at two threads I am maintaining over on 924board.org:
Performance Upgrades: Tires, Wheels, Suspension & Brakes
Illustrated Guide to 5-lug Conversions
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Old 12-30-2008, 08:07 AM
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