hfm

I still don't think the precise speed matters. I believe this is the bed in process I started with the same as you're citing:

http://stoptech.com/technical-suppor...-system-bed-in

Overtime, I've gone with the KISS process, and sure, you don't have to go to 0 but, it shouldn't make much difference whether you do or you don't. I suppose in theory, there is no abrupt stop if you don't go down to 0 and that might make a bit of difference on how the pads wear on the brakes but, in practice, it hasn't made any difference for me. But, I'm not going to argue with the experts.

Dan (has Stoptech 13" on his 350z)

dadams1598

Good article Spooky, thanks for sharing. Interesting to read that brakes may need to be re-bedded if you are soft on your brakes after initial bedding.

AWW100

How do you define hard stopping from 70 to 0 hard enough but not trigger ABS?

Alan C.

Threshold braking. Its what we did before ABS.

bronson7

The part I don't understand is why do the brakes squeal in the first place? I've owned 2 other Pcars and neither one ever squealed and I never bed them. I've owned many cars and trucks over my 40 plus years of driving and never once had to bed the brakes and never had brakes that squealed. Can some one explain why sport cars in general can squeal and your every day low end car doesn't?

zedcat

Can't give a technical explanation but am sure that the pad material is a factor. Most track pads I've heard squeal. The pagids I've used are noisy. Also on 987s and 986s (not sure about other models) there are puck/shim things- called dampers that fit into the caliper pistons to reduce noise. When I went to track pads I left these out and that contributes to the noise. I don't know for sure if the GT3 uses similar (haven't had the pads out yet), but I don't think so. Looking at brake parts on Suncoast I don't see them. Of course the caliper design is different too. Bottom line I think Porsche prioritized brake performance over noise/comfort considerations.

stronbl

zedcat is on the right thought with the brake squeal. The squeal from most brake pads is caused by the vibration of the pad backing and the force from the piston. Street or highway brake pads use a less aggressive friction compound than track or race pads since their stopping requirements are not as demanding. These extremely aggressive track/race compounds tend to induce much more vibration than street or highway pads. The use of vibration damping (mechanical or chemical) helps but may not completely resolve the vibration ... i.e. squeal.

Bedding the brakes as discussed already helps too in that a proper bedding will tend to create a more uniform surface between the brake pad friction surface and the brake disk. This uniform surface helps to reduce the vibration and thus squeal. Unfortunately this is a temporary solution only. As the brakes are deployed over time, and especially in an aggressive or repetitive sequence (e.g. spirited or track driving) the surface between brake pad and brake disk changes from the smooth surface when freshly bedded to one with more variations (this applies to both surfaces -- pads and disks). The result is an increase in vibration and hence the potential for the brakes to squeal.

I have found using a combination of very good high temperature ceramic anti-squeal paste (ceramic won't cause a degradation in the rubber caliper boots and seals) and anti-vibration shims help. I always get squeal on the track, but I have significantly reduced the squeal around town. The occasional re-bedding helps too.

bronson7

Great explanation Stronbl. I figured there had to be reasons. Is the ceramic anti-squeal paste readily available at general automotive suppliers?

Just in time

I washed my car today and the squeal came back. Maybe brake dust might have something to do with it. I think these brakes will continue to squeal for a long time.

need a 993

What he said. It says so right in the manual.

Frankly, I think it sounds cool!

carcommander

I just ignore it. Or laugh.

fxz

I love my brakes when squealing

as you said happens when (too..) light pressure on brakes (and brakes are still cold...)

to avoid screeching just push higher or more convinced a bit on brakes

aamersa

My brand new steel brakes had a loud squeal at stop signs and lights. It went away immediately after my first track day.

bhf_clt

Glad this was posted today. The screech from my brakes the past few days has been insane. Have 1,400 miles on her. Will try to bed her within the next few days. I don't mind some screeching, but the noise lately has been a little over the top.

stronbl

I use this product ... pretty happy with it, especially temp range, on Porsche / Brembo brakes - pad backing and pistons only not as an anti-seize on bolts.

Permatex 24125 Ceramic Extreme Brake Parts Lubricant, 8 oz.