Dave 86 930 Fl

I've been experiencing a brake lockup on the front passenger side of my car, so I'm in the middle of rebuilding the front calipers. I purchased a rebuild kit from Pelican that includes the rubber seals and dust rings, but I need to replace one of the pistons and I've been unable to find a source online. I'm going to call the local Porsche dealership on Monday. I'd appreciate it if anyone can direct me to a source for new pistons.

Regards, Dave

Gary R.

Dave - are your pistons corroded beyond a good cleanup? I'll be rebuilding mine soon, would be interested in hearing how it went (and where to get parts).. Pelican has them for a Turbo but only up to 1977 - http://www.pelicanparts.com/catalog/...g11.htm#item10

Dave 86 930 Fl

Gary,

No corrosion on the pistons from the front driver caliper, but I suspect that one or more was hanging up and causing the lockup on the front passenger wheel. The car pulled to the right and the front right wheel was hotter than the left after heavy braking, which leads me to believe that the front right was working harder to makeup for the weak front left brake.

I used the technical article from Pelican to guide me. The hardest part (for me) was removing the dust seals. I used a small screw driver to pry them off and I damaged a piston in the process. Also, be very careful (safety glasses) when using compressed air to remove the pistons as they shoot out like a bullet ... damaged another piston. I found the following site that sells pistons:

http://www.zeckhausen.com/Brembo/Con...es.htm#Rebuild

Let me know if I can help you when you take on the rebuild.

Regards, Dave

Gary R.

Thanks Dave. When I did my TR6 pistons I put something between them when I hit the compressed air to them. So you saw nothing obvious when you dismantled them. Have you tested them out yet?

That site is for Brembo calipers, is that what I have? Also needs to know what size (mm)..

Dave 86 930 Fl

Gary,

No nothing obvious, but the car is 21 years old and was not driven much before I purchased it 7 years ago. I'm not sure what caliper you have, but I'd guess it's a Brembo. The inside of my caliper has a Brembo logo on it and the pistons in my caliper are 36 mm. I need to source the pistons before I reassemble the caliper ... I'll post as soon as I get the parts.

Regards, Dave

Gary R.

Dave - I also asked about this on th 911 Forum and got this answer from Steve W. at Rennsport regarding the Zeckhausen Brembo pistons..

"Those pistons do NOT work in 930 calipers as they do not have the anti-taper wear reliefs. Those work for the various S-4 type calipers (964-944-928-993-993TT).

Porsche is the onlky source for 930 caliper pistons; BTDT,....too many times. "

Dave 86 930 Fl

I ordered some new pistons this morning at the local dealership, $40 each. I should have them in 3 days and I'll get things back together.

Regards, Dave

Gary R.

$40 each? That's not too bad (for a dealer item). Let me know if they show up on time..

1980-930

Dave, you ever spend any time around Vero Beach - say around Thanksgiving?

A930Rocket

I rebuilt some S4 calipers a couple of years go. Those rebuild kits with the pistons weren't cheap. And you bought them per caliper piston.

If there is a raised side on the pistons, make sure you have them oriented right in relation to the caliper/rotor.

Dave 86 930 Fl

A930Rocket,

180 degrees of the piston's contact surface is raised as per the (lousy) picture below. Before removing the stock pistons, I noted that the "low side" of the pistons was oriented towards the top of the caliper and the rotor enters the caliper from the top side. Also, I've been told that the pistons must be oriented at a 20 degree angle from a horizontal line through the caliper.

Does this make sense, hopefully I've described the process appropriately.

Regards, Dave

Dave 86 930 Fl

I'm not very far from Vero, so we get down there fairly often. I like the front valence in your avatar, do you have any larger pictures you can share?

Regards, Dave

1980-930

Dave - (small world) well you can imagine my surprise when I was driving (rental car) from West Palm airport to visit my inlaws (as we do every Thanksgiving) when coming the oposite way towards me WAS MY CAR! You were going towards the freeway and I was going towards Vero. Beautiful car my friend! Love the color! Mine is actually an 82 - Pacific Blue Metallic is what I was told the color was called. Here is the pic you wanted to see.

A930Rocket

Here's what I have from the manual. Looks and sounds like you have it right.

Dave 86 930 Fl

Gary,

I ordered on Monday and they showed up on Tuesday ... That's what I call service. All 4 nicely bagged from Brembo with Porsche logos also printed on the packaging.

Regards, Dave