924Board.org

[Guest]

From: Bob
Email:
Date: 05 Mar 2000
Time: 23:41:29

I'm getting ready to part out two sets of 931 brakes and two sets of 944 brakes and been seeing what will fit what.

I've been looking into this on a parts level. Here are some interesting things.

79 931 used a 928 master cylinder

81 and 82 modesl use a revised unit from the 80

The internals on a 80 931 master cyl are 928 parts

the 944 and 931 do not share master cyl or booster

the 80-82 931 uses the same booster

I've been told that you can't swap the two different 944 master cyl, one ate the other is girling

The rear calipers are the same for all 924/931 and 944.

80-82 931 have the same front calipers as do the 83 944, the 84 944 begins a new part number, anyone know why?

924/931 share the same A-arm until somewhere in the 82 year model than they switch to a 944 A-arm and the 924S A-arm

79-82 924 and 80 931 share the same spindle(probably the brake thing may come into play)

79-80 931 m-471 thru 81- 82 931 and 944 until 85.5 share the same spindle

85.5 - 86 spindle on left different (probably due to speedo cable )

So I believe this means that any 79-82 924 can fit a 931 turbo brake or 83 944 brake to the front

The rear conversion looks like you need to just change the brake backing plates, the stub and bearings fit 924 to 944 up to 85.5. This area is a little confusing so take caution. The parts book shows a plate for the 944 but not for the 931, but it does show a cover for the bearngs on the 931 but not for the 944.

More to come as I have time, I am going to try and make a physical comparison after I finish the parts list.

[Guest]

From: Vince
Email: PonzV@aol.com
Date: 06 Mar 2000
Time: 10:35:42

This is the kind of info I was refering to a while back. Thank you.

See you all at Hershey?

Vince

[Guest]

From: Vaughan
Email: vscott39@hotmail.com
Date: 06 Mar 2000
Time: 10:56:42

I swapped the brake system from an 84 944 onto first my '77.5, then my '79 924.

The rear brakes swapped in as described, by switching the backing plates, stub axles (probably not necessary), hubs, etc., plus the hard line from the caliper to the hose.
The fronts I swapped in the strut assembly and upright. The balljoints of the early 924's (including my '77.5) are of a smaller shaft diameter, and will not fit the larger bore on the M471/944 upright. This can be fixed by either using the M471/944 a-arm, or just swapping in the newer balljoint onto the old a-arm - they are compatible.

The MC is the biggest PITA, as the lines have to be re-routed due to different layout of the MC hydraulic circuits. Basically, they're mirror-imaged front to rear and side to side. I'll have to take a picture or two of what I did.
The reason for the change is to clear the CIS fuel distributor - with the 944 booster (yes, it does fit) the old layout would hit the metering unit. Amusingly enough, this was carried over into the 944 (from which I got my MC).