Help identifying a Caliper

5:04 · 02-23-2011, 07:28 PM

Hi guys,

My 911 came with a 928/930 brake set up. If you guys wouldn't mind helping me identify what year this calpier/rotor combo came off of I'd appreciate it. I need to replace the front pads and would like to rebuild the calipers so it'd be very helpful to know what years they were on.

Thanks!
Amir

MPDano · MPDano's Garage

That looks like an 928 S4 Caliper. Just take the part number off it and punch it in Pelicans Part search. It should come up with a year range.

Griffinroydonal · Griffinroydonal's Garage

That looks to be standard 928s4 parts and came on 1986.5 and up. These are 4 piston and have all the power you will need. I cant imagine how fast they would stop a lighter car.

Not a good picture but you get the idea.

5:04 · 02-23-2011, 11:19 PM

Thanks guys!

The car definitely stops pretty well now, but with no Power assist and 2300lbs I have a lot of trouble getting a good bite out of the Pagid Oranges in there since it's tough to get heat. I'm going to switch a carbotech front rear set up, rebuild my calipers, and enjoy my excellent stopping!

Pete R · Pete R's Garage

The early S4 and later S4 calipers have different size pistons by a couple mm. There are no outward visual clues to tell the difference. Unless there is a part # on the caliper, you my just have to pull the pistons and measure them to insure correct new seals. BTW. to install those on a 928 we would have to flip them over and change the plumbing (mounted on the trailing side of our rotors)

MPDano · MPDano's Garage

Quote:

Originally Posted by 5:04

Thanks guys!

The car definitely stops pretty well now, but with no Power assist and 2300lbs I have a lot of trouble getting a good bite out of the Pagid Oranges in there since it's tough to get heat. I'm going to switch a carbotech front rear set up, rebuild my calipers, and enjoy my excellent stopping!

Let me know how those Carbontechs work as i have been trying to get feedback on them with those calipers.

Pete R · Pete R's Garage

The issue may not be the pad. I have early S4 calipers on my 928 with stock pads. They too seem to lack intitial bite. They will stop great but the caliper feels like its slow to react. On the other hand I have Big Reds on my 951 with Pagid orange. They have crazy initial bite even cold. Almost too much, it takes a lot of practice and a real precise foot to manage it

5:04 · 02-24-2011, 08:50 AM

Quote:

Originally Posted by Pete R

The early S4 and later S4 calipers have different size pistons by a couple mm. There are no outward visual clues to tell the difference. Unless there is a part # on the caliper, you my just have to pull the pistons and measure them to insure correct new seals. BTW. to install those on a 928 we would have to flip them over and change the plumbing (mounted on the trailing side of our rotors)

Well that took the easyness of the rebuild kit away haha, but I have the wheels off so often I'll just look for a part number.

Quote:

Originally Posted by MPDano

Let me know how those Carbontechs work as i have been trying to get feedback on them with those calipers.

I've always had excellent experience with them on all of my cars, I suggested them to a friend with an e46 M3 and he loves them. I was torn between the Carbotech and the PF but the cost difference is around $100 so I plan on sticking with what I know. I'll be sure to give a full review after a track day with them.

Quote:

Originally Posted by Pete R

The issue may not be the pad. I have early S4 calipers on my 928 with stock pads. They too seem to lack intitial bite. They will stop great but the caliper feels like its slow to react. On the other hand I have Big Reds on my 951 with Pagid orange. They have crazy initial bite even cold. Almost too much, it takes a lot of practice and a real precise foot to manage it

This was what I was fearing, I like that intial bite since I think it makes me (feel haha) faster. While it's not so bad to not have that initial bite, I think it makes me a little weary since I'm used to cars that instantly bite and stop. I'd prefer the feel that you say the big reds give. I'll try a rebuild and new pads up front for a few months. If that fixes it then great, and if not I'll change it.

Once again everyone has been a great help! Thank you guys.