scleo711

I have a 1989 944S2 that I am changing the brake pads. I need help in indentifying the brake setup that is in the car. The calipers are painted black and say" PORSCHE" on the front, and "brembo" on the back. It is a 4 piston caliper.The only numbers on the calipers are 20.4691.00 on one half of the caliper, and 20.4692.00 on the other half of the caliper. These markings are next to the brake pad shims.
The brakes that the parts store has fitted for the car are PBR D 951 R. These fit into the openings with about 1.5 mm clearance from the shims on the side. I do believe they are the right pads. The problem I am having is the round vibration dampeners that they gave me are the wrong diameter.The calipers piston specs are, 40mm OD ,~31mm ID; 36mm OD, ~28mm ID. Each caliper
has two pistons of each of these sizes on the front calipers. The dampeners they provided are 24mm and 20mm. Even the Porsche dealer brought out the wrong sizes according to all the vehicle info I presented to them.

Here is the vehicle info:

VIN: WPOAB2940KN452021
Rotors: 951.351.401.02
Shocks: Yellow adjustable Konis 951.343.03211
Option codes: 220,454,474,490,494,533,573,593,650,946

All of the parts sites I have visited don't even list the dampeners that large. The Porsche dealer did have a dampener that fit one of the pistons, but it was from a 928 brake. The matching 928 dampener did not fit the other piston.
I believe they are the factory brakes. The brakes are squealing badly, any recomendations? Does anyone know what brake setup is on this car, and what are the back caliper specs for the dampeners? I haven't opened them up yet.

Thanks if you can help!

V2Rocket

You can use plastilube or copper anti-seize on your brakepads and they will stop squealing.

944 Turbo S cars had the same brakes as the 928 S4, you might have a swapped caliper.

Tom R.

you have the 454 and 474 options. i am not 100% sure but believe the 474 is the double adjustable shocks,and the 454 may be the "S" as in turbo S for 88 or turbo for 89 brakes which instead of the regular 955 turbo (951) two piston brembos are the four piston brembos 'borrowed' from the 928.

i just looked at your option codes again. i am pretty sure the 220 is lsd. you have a S2 with all the turn fast/stop fast (i would say go fast, but the motor is the stock 208hp) goodies. nice find. where are you located?

do a search for the porsche option decoder. I put the 474 shocks in my S2 and I think they are the same as the ones in my buddy's 89 951. I know his brakes are bigger than mine. im not sure how the options worked on the S2, but if you have brake coolers you probably have the four piston brembos from the 928.

as an aside, how high does your speedometer go? 160 or 180? If you have all these turbo S options on your car i wonder if they threw in the speedometer too.

bjzorn

You mention the Yellow Koni's to me it sounds like you have the "Big" brake option or the 928 Calipers. You have one very rare S2. So the pads and dampners for the 928GTS will work. I am suprized your dealer didn't catch that from looking at the VIN.

Tom R.

i have the same konis in my S2. but mine didnt come from the factory, his did - note the 474 option code.

PorscheDoc

Post a picture of the caliper.

bearone

474 was only stiffness/rebound, not height adjustable.

87951

bjzorn

I know that, but the M474 option to me brings up some more questions. normally I would look at the car if it was there or send off an email to PCNA to see if the car had bigger calipers. My car has the M031 option(Which is Koni Yellow Dampers) Some dealers know this some don't. The good parts guys ask questions and get the right parts. I firgured since he said the standard S2 vibration dampers didn't work and given the option codes that he had the bigger brakes. I just re-read your post. Go to the Porsche dealer if you have one near by. The correct vibration Dampers will also fit the 964s and the 993's. So ask them to cross-refence the part number in PET7 and see all the models the dampers fit.

Good Luck

Tom R.

mine have a collar with a thread on it that i thought was for the height. when i punched the part number into pelican it came up with a picture of what i had and it said it was for the 474 option.

i may be wrong. here is the link. i cant check the PN of the part on the car to match it to the PN on pelican.
http://www.pelicanparts.com/cgi-bin/...FILTER_TOOL=ON

do you know the option code for the height adjustable ones, or is it that the 474 is not height adjustable, but the replacements are with the same PN?

bearone

collar/perch, i understand the confusion but from pelican the 474 can be dampened and the m030 is height adjustable.
clark's also says height adjutable with m030

951-343-031-06-OEM Front Sport Gas Koni Strut Assembly With Adjustable Dampening, M474, Left, 944/944 Turbo (02/85-88), Each
Brand: Genuine Porsche
$410.25
951-343-032-06-OEM Front Sport Gas Koni Strut Assembly With Adjustable Dampening, M474, Right, 944/944 Turbo (02/85-88), Each
Brand: Genuine Porsche
$410.25

944-343-051-00-OEM Front Sport Gas Koni Strut Assembly, Height Adjustable, Left, M030 With Sport Suspension, 944 (1983-86), 924S (1987-88), Each
Brand: Genuine Porsche [Photo] [view in parts diagrams]
$745.25
944-343-052-00-OEM Front Sport Gas Koni Strut Assembly, Height Adjustable, Right, M030 With Sport Suspension, 944 (1983-86), 924S (1987-88), Each
Brand: Genuine Porsche
$745.25
951-343-031-32-OEM Front Sport Gas Koni Strut Assembly, Height Adjustable, Left, M030 With Sport Suspension, 944/944S/944 Turbo (1987-89), 944S2 (1989-91), Each
Brand: Genuine Porsche
$730.00
951-343-032-32-OEM Front Sport Gas Koni Strut Assembly, Height Adjustable, Right, M030 With Sport Suspension, 944/944S/944 Turbo (1987-89), 944S2 (1989-91), Each
Brand: Genuine Porsche
$730.00

951-343-524-00-OEM Adjusting Nut, 1 Per Strut, 944/944S/944

i have the 474 option, have measured 26.4mm on the front, 19mm on the back, have the **** to adjust dampening and the po said no coilovers, which is height adjustable.

hope this doesn't muddy the water too much.

i grew up in denvah, graduated from east high in '64.

87951

Tom R.

all the fronts have the coils on them. i have the collar to adjust and thought the collar was the 474 option.

did the 951S come with the collar to adjust height or was that an option on the S as well?

here is a shot of my fronts which when i ran the number on pelican i thought said 474 option.

bearone

474 just had the dampening adjustment with the ****, which is what i have.

can you adjust the dampening rate with the ****?

i've never seen the whole strut, out of the car, so i'm not sure what the perch looks like and how much different the reg springs are from the ones that are height adjustable.

i imagine the "s" did have the collar and had m030.

Clark W

I also have a 1989 s2 with the 474 option. The only pucks I've found that work are:

928.351.096.17 for the 36 mm pistion
965.351.096.00 for the 40 mm piston

These are the same pucks for the 928 S4/GT. I had to bend the splines on the 965 part a bit to get it into the piston.

Good luck. -clark

scleo711

The car is a 1989 944S2 that i got five years ago from my uncle with 38,000 miles on it. Speedo goes to only 160mph. Car now has 80K with service work for new clutch, air cond compressor, p/s hoses, water pump, timing belt and tensioners. I'm in the Northwest.

Now the bad news, it's my wifes car. I'm really a BMW guy, 1972 2002, 1988 325IX, 1988 M5. In 1975 I had made an offer on a 1975 911E Targa, but the guy sold it on me. Got the BMW 2002 instead, looking at 600,000 miles these days, was a great daily driver, summer use now.
Anyway, I do most of my maintenance on the BMWs, take hers to a shop because of time and knowledge. But decided I could do a basic brake job to save some money. But finding the correct parts has been another story.

From all of your posts, I have deducted that I have the regular S2 suspension(non Club Sport M030), I have adjustable damping Koni yellow shocks, but the brake calipers are Porsche/Brembo 4 piston design, normally a 2 piston design in that car. Piston specs that I have measured are 40mm and 36mm OD, with 30mm and 28mm ID respectively.
Most listings for the brake pad vibration dampeners specify 24mm and 21mm dampeners for the 40mm and 36mm pistons. I've read your posts about where these brakes may have come from, I guess I'll keep looking using your ideas.

I didn't realize how much enthusiasm there is for these cars. You people are great. I go to Maui 3 weeks out of the year, I'll look for your car, Maui owner.
I'll send some brake pix. Can I just leave off the dampeners? I'm putting new rotors and bearings in also. Rotors that I purchased for the normal suspension
(non M030) fit correctly. I just can't seen to find the right vibration dampeners!
I can't wait till I look at the rear brakes!!!


Steve

CarbonRevo

Look to be the standard 944 S2 brakes. Not the Turbo S or 928 big blacks.

Can you post a picture of your brake pads?