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Originally Posted by ricola
I'll add my experience...
I started off doing the rear brakes first as there was a delay on sorting my front bearing adapters. Using the bug m/c, that was the best combination by far so I should have just drilled the front discs to Porsche pattern.
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I agree!
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The bug m/c has not got enough displacement for the single pot front calipers no matter how much bleeding you do.
Rich
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Thats not my experience...
I still use the stock m/c on my 1303 with 944 Turbo Cup brakes front and rear. The Cup brakes are even larger than the stock turbo ones, but I have a very hard pedal; can easily lock front brakes, but bias sucks! The back should give more brake action, so I'am not sure what the best way is. Mounting a m/c with even more travel up front certainly is not (for my car that is). Maybe a 23/23 m/c which can be squeezed in the front lines or s/th like that.
Because of the rear engine and 'reverse' weight distribution of the bug compared to a front engined/watercooled car, mounting the same m/c seems pointless to me. Fitting a m/c with 21/19 cups rear/front would make more sense to me...
I also have the 944 N/A brakes on my squareback now and, as with the bug, the pedal got harder after the swap! Logical, cause the drum brake always needs more travel to get to the drum, after which the spring retracts it.
I suspect, m/c diameters front/rear are just used to also get the required balance from the factory. The displaced volume when breaking may just be so little (with good seating, well broken-in pads), that 19 or 21 mm may not make a noticeble difference in that aspect.
Really, really make sure your pads are broken in properly before you judge any 'sponginess' you may think you encounter. Usually our bugs are not driven that much nowadays, so judging too soon the pedal feel is an easy mistake, I suppose.
Good luck all,
Walter