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Who with experience on the 5 stud upgrade for L and MY can tell me what brake master cylinder is most appropriate to use. The Grugerys manual I have for Gen 1 Libs specifies that the ABS equipped Libs have a bore of 26.99mm and Non ABS 25.4mm. So what should I go with.

There are plenty of aftermarket master cylinders on fleabay, but the only ones that list as 26.99mm (6073 seems to be a generic part number).

I only want to change the master cyl for now in preparation of brake upgrade, so would it be a bit much to use the larger 26.99mm to push L series brakes?

Use what matches the donor brakes.

A lib booster on an L or MY will do the following - from what Bratgeebah has told me from his experience (that ultimately wrote off his L wagon):

The lib booster will initially have no braking effect, but you will come to the point the brakes begin to work. At this point it is a very quick move from safe braking to complete lock up.

Personally I'd stick with what's factory then go with the conversion all in one hit

Cheers

Bennie

Thanks for your input Bennie. I had only considered changing the master cyl and not the vacuum booster as well for the Lib. Does the booster also need to be changed with the m/cyl?

J.

I think he's talking about brake master cylinder not booster.

I can't exactly speak for what is best, but when I upgraded to EJ brakes in my L series I put in the matching master cylinder (to match the brakes) and kept the original L series booster in place. The Liberty booster looked physically quite a lot bigger and I didn't think it would actually fit next to the strut tower.

My brakes worked perfectly.

AndrewT wrote:I think he's talking about brake master cylinder not booster.

Yeah sorry, I may have got that bit wrong, I don't know if he changed the booster over as well, but I certainly know he was running stock L series brakes on a lib master cylinder.

Cheers

Bennie