early 944 brakes, stock MC....dosent feel right

[LOAF]

Super VW

Great question, would like to hear what people will say.. I am in a similiar boat.. Not too long ago at a swap picked up a new VW M/S for my 1303 but I had the same suspisions..

Some folks have used 911 and 944 but not sure how.. not yet there.. but I believe there may have been some bias issues..

Be patient and some folks who are a little ahead of us will respond..

ALex

[zen]

i am running 951 brakes with a 944 M/C, so i can't speak with authority, but i think there are more than a few guys running 944NA brakes with a stock M/C. and you are sure they are fully bled right?

[boygenius]

I am with Zen, double check that ALL the air is out of the system.

You have a super correct with the 944 spindle/hub/caliper swap via a kersher ball joint.

Did you have good brakes before you did the swap.

Are you using new (newer) rubber/stainless brake lines. One of mine had a tiny pin hole in it and it drove me crazy because I could never get a firm pedal but when I would look under the car I couldn't find a drip untill I finally replaced the lines and when I bent one of the lined I could see a little crack with brake fluid seeping out of it.

Check that you still have the required clearence between the brake pushrod and the master cylinder. If thre is no clearence the fluid won't return properly and you will never get the air out.

Make sure ALL of your fittings are tight. Double check them. If they are a little loose the fluid realy won't leak out but when you release the pedal air will be sucked into the line.

Hope that helped...

[super vw]

Now that you mention it, there MIGHT be some air in the system still. i went and applied the brakes this morning and could here a slight squish of air near the MC. so i think your right... i need become a killer and let this sucker bleed

i have not noticed any leaks of fluid, but when i was using a hand held bleeder deal that sucks the fluid/air out it would let some fluid out but more air than fluid. then all of a sudden it would just drop in pressure and suck only air. But when we went to try bleeding it the manual way (one person pumps, one opens valve...) their was only fluid coming out maybe tricking us that we had it fully bleed...

So i will give it another try today and see what happens.

Thanks, ill tell ya how it goes.

Jonathan

[boygenius]

Sometimes the vaccum bleeders will suck air from around the fitting on the caliper. The rubber cap from the vaccum pump hose that goes over the bleeder should fit tightly, if not it will suck a little air from around the fitting. I would still double check the tightness of your fittings. Good luck.

[Jeza]

I'm also in a similar boat.

944 single piston calipers all around and a stock bug 19.06mm master cylinder.

I also have a fair amount of pedal travel and quite a bit of squish. It does get firmer with some pumping but I'm pretty sure I've got the air out of there. I'm not getting any air when the calipers are bled, unless it's hiding elsewhere.

I've been suggested to check out shimming down the front pistons instead of using the 944 mc. The reason behind this is that the 944 is a front engined car and the brake balance will be set up as such.

I reckon if the front calipers are approx 44mm diameter the front to rear ratio will be about right, and similar to the CB kits, just bigger and vented.

Do the 4 pot calipers have less volume / fluid area? The 4 pistons make them more efficient. This may effect the pedal feel.

Hopefully this sparks some thoughts

Cheers
Jeremy

[Jeza]

Okay a quick ask around brake shops at lunch yielded no results- so perhaps my comment about shimming / sleeving the front calipers was barking up the wrong tree.....

Any comments

Cheers
Jeremy