930 Brake Gurus Help

MT930 · 04:49 PM

I am changing pads on my 87 930 so far so good.

I have the turbo manual so I am pretty clear on procedure. Few questions.

Disc's are 31.20 / 31.10 MM within tolerance
Got them just in time about .5MM to go before they got into the sensors

#1 can I reuse the spring plates AKA squeal shims the old ones look pretty good. both wer in ther I cleaned one up for comparison

#2 Are they glued on ? the outboard on both fronts were loose the Inboard ones were still attached but not well they are all flat and true with the exception of very slight impressions of the caliper pistons witch looks normal.

#3 What do you recommend to use for the lube for the spring plates AKA squeal shims to piston. Optimoly Or plastilube is called for in the manual,
can I use anything else?

#4 Whats the wire in the internal disc for, weight for balance?

any other tips you have would be great.

cl8ton · 05-31-2009, 06:05 PM

Questions 1, 2 & 3…
Just buy new pads (I use Mintex) < $35 a corner from our sponsor!
They come with everything you need to do a corner pad replacement.

#4, it is used for balancing the rotor from the factory.

MT930 · 05-31-2009, 08:03 PM

Thanks cl8ton

I am putting on new Pagids. I was wondering about the thin plates between the pads and the pistons.

Pelican is calling them "Anti-Squeal Pad Inserts"

Do Pelican inserts have dimbles for the Pagids. I am guessing they have some type of light adhesive so they mate up. Looks like it burns off quickly

My new pagids did not come with new inserts. The old ones look pretty good
they have worked great. I am inclined to reuse these, with fresh lube.

Pic:

MT930 · 05-31-2009, 08:04 PM

JFairman · 06-01-2009, 07:26 AM

I would install them without the anti squeak plates and see if they sqeak.
If they don't or just squeak a little you're way better off without them in there because they make the brake pedal mushy.

If you don't believe that, try putiing a few of them behind each brake pad... it multiplies the squishy brake pedal effect.

fredmeister · fredmeister's Garage

I never use anti squeal pads and don't have trouble.
You had a lot more life on those pads in my opinion. Save them as spares.
I run down till 2mm or 1/8 inch left on pad material befroe changing.

MT930 · 06-01-2009, 10:38 AM

Thanks

The face of the old pads were deeply cracked after the last DE, heat had taken it's toll, they were very close to getting in to the sensors.

I may try them without the squeal pads the brakes have been good. Maybe better with out ? Squishy brake pedal effect, makes sense.

A930Rocket · 06-01-2009, 06:03 PM

If you are using the car for the track, then I would not go past 1/2 way, but keep them as spares. The closer they get to the backing plate, the more heat is transferred to the caliper and thus possible air in the system.

What Pagid pad are you using? I'm using Yellows and really like them. No shims used.

A930Rocket · 06-01-2009, 06:05 PM

If you do use the shims, can't you turn them inside out so the dimples don't face the pad? From the pics, it doesn't look like they will hit the caliper pistons.

fredmeister · fredmeister's Garage

Quote:

Originally Posted by A930Rocket

If you are using the car for the track, then I would not go past 1/2 way, but keep them as spares. The closer they get to the backing plate, the more heat is transferred to the caliper and thus possible air in the system.

What Pagid pad are you using? I'm using Yellows and really like them. No shims used.

Good point and correct. I just am too cheap to throw away pads with that much meat on them still. Racing pads especially Pagids are too $$$.
If you use the car for track days you should consider getting more air to the rotors via removing the backing plates and adding scoops which should aid in eliminating fade/boiling fluid and increase pad and rotor life.

MT930 · 06-04-2009, 11:49 AM

Quote:

Originally Posted by fredmeister

I never use anti squeal pads and don't have trouble.
You had a lot more life on those pads in my opinion. Save them as spares.
I run down till 2mm or 1/8 inch left on pad material befroe changing.

Old pads were Pagid Black they looked like they came off the space shuttle the heat was extreme. I could have used them on the street for a while longer they were fried.

I did have a brake boiling incident last year at the track. If the pads are in the first 50% of life no problems with heat. I have thought about taking the backing sheet metal off for more cooling I will need disc's after a couple more pad changes I'll try it then. Disc's have slight cracks not bad yet.

I am trying Pagid Orange for the track I have heard good things, any comments on what to expect from the orange pads.

A930Rocket · 06-04-2009, 02:54 PM

Yellows are best, then black, then orange in my opinion. Oranges will create a lot of dust and clog the holes to the rotors in no time.

Definately remove the backing plates to get more air in there. Can you add brake ducting? Sounds like a lot of heat is being generated and you could really use it.

Also, don't ride the brakes or brake for extended periods of time (braking too early and keeping your foot in it).

gumba · 06-04-2009, 03:18 PM

We have 930 brakes on our n.a. race car. I switched to orange on the fronts and blacks on the back for a better balance. This was suggested by Steve @ Rennsport. Also switched to the Castrol SRF brake fluid from ATE blue.

MT930 · 06-04-2009, 06:34 PM

Quote:

Originally Posted by A930Rocket

Also, don't ride the brakes or brake for extended periods of time (braking too early and keeping your foot in it).

I figured that out early, particularly after 50% pad life !!!

I understand the orange pads are disc friendly but make the dust. I had a few people tell me they are great balance on the 930 in the front with blacks in back. We will see.
Thanks

billjam · billjam's Garage

In a recent thread related to getting more rear braking, Craig 930 RS recommended yellow fronts rather than orange ...

930s use the Pagid size 1203 F&R -
Some folks use a higher friction rear (Black) with Yellow up front to get the rears to work more; typically I see this with 996 GT3 customers.
Reference: www.Rennstore.com

Thread link reply #20

MT930 · 06-07-2009, 06:46 PM

Road test today. No backing plates firmer petal. No noise that I can hear driving the car. I did not really get on them to early. They are an improvement for sure. The track will be the true test I have to wait until sept.

No hard braking for the first 30 miles or so. Then a couple moderate stops, Wow!

I think I am going to like these orange pads. I will try the yellows next time.