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How do piston seals affect actuation times? Is it stretching of the seals under pressure increasing

Posted by: RocketBoy on 2005-06-02 21:55:04
Account #: 37205

In Reply to: I think it's more the piston seals then anything else that you'll notice with on/off times... posted by ryans4 on 2005-06-02 14:57:55

the caliper displacement volume?

New thread.. Brakes what has Pat tried, and what is his summary, Ryan and others may chime in - Milpitas2.7T 2005-06-02 11:46:50 (485 views)

all are better then the stock anchors, but like everything, how much do you want to spend... - ryans4 2005-06-02 12:58:32 (3778 views)

Got another question for you if you don't mind... - RocketBoy 2005-06-02 21:59:48 (317 views)

actually, i'm backwards, the leading edge of the pad is hotter then the trailing edge... - ryans4 2005-06-03 08:12:53 (319 views)

I think stock brakes grab HARD with very little pedal pressure, how do the various kits compare to - mjtaylor 2005-06-02 15:26:43 (364 views)

well, you have to assume the same pad. At that point, pedal feel is going to be based on pistons... - ryans4 2005-06-02 15:41:23 (439 views)

Depends on which pad you have in there... - RKA 2005-06-02 15:39:49 (386 views)

Do you think that caliper displacement has any significant affect on brake actuation time, or the - RocketBoy 2005-06-02 14:46:10 (352 views)

I think it's more the piston seals then anything else that you'll notice with on/off times... - ryans4 2005-06-02 14:57:55 (346 views)

How do piston seals affect actuation times? Is it stretching of the seals under pressure increasing - RocketBoy 2005-06-02 21:55:04 (254 views)

the seals retract the piston when off the brakes... - ryans4 2005-06-03 07:59:16 (333 views)

Of course there will be. *edit in regards to time vs. pressure* - Pat-SoCal 2005-06-02 14:56:52 (297 views)

That's a good point. I have always wondered about the ability of stock master cylinders to be able - RocketBoy 2005-06-02 22:05:08 (259 views)

I have a question... - RKA 2005-06-02 13:59:32 (375 views)

Jumping to eight pistons often means less pad area. - ryoung 2005-06-02 22:09:58 (526 views)

does 8 pistons always mean 2 pads per side like that? - Andrew C. 2005-06-02 22:39:00 (308 views)

Not certain, but I believe yes. - ryoung 2005-06-02 23:10:04 (290 views)

Hmmm... - ryans4 2005-06-02 14:24:41 (783 views)

Re: F1 brake calipers - ryoung 2005-06-03 00:26:39 (406 views)

good to know. Interesting that the caliper is that long for only 6 or 4 pistons? - ryans4 2005-06-03 07:52:49 (248 views)

They get an amazing amount of stopping power under a 13" wheel. - ryoung 2005-06-03 08:46:48 (234 views)

My simple-minded thoughts for our application: - Pat-SoCal 2005-06-02 14:38:12 (387 views)

oh sure, if you put the whole "B5 S4 street/track car" restriction on it... - ryans4 2005-06-02 14:42:41 (362 views)

Put it in terms of a race car: - Pat-SoCal 2005-06-02 14:49:01 (340 views)

LOL Totally agree - Eric Fletcher 2005-06-02 18:26:15 (298 views)

more pistons doesn't have to mean longer pedal travel? - ryans4 2005-06-03 07:49:41 (384 views)

What I was saying was... - Pat-SoCal 2005-06-03 08:28:19 (324 views)

ok, i do follow you, and you are totally right, but... - ryans4 2005-06-03 08:42:28 (300 views)

Yeah, exactly - Pat-SoCal 2005-06-03 08:58:28 (373 views)

from your posts, i'm guessing your brakes come on quick... - ryans4 2005-06-03 09:01:44 (386 views)

How cute? You guys should hug now... go ahead closing my eyes. - Tomasz@StartupRacing 2005-06-03 10:57:36 (370 views)

i'm not sure I follow you, but I'm sure I agree... - ryans4 2005-06-02 14:52:09 (282 views)

I just started my ESL class :P - Pat-SoCal 2005-06-02 14:58:29 (241 views)

Hero post, please add to FAQ or Searchable archive or something, seriously. - Milpitas2.7T 2005-06-02 13:22:42 (258 views)

Nice writeup. - NO.BRAZIL 2005-06-02 13:21:21 (235 views)

Nice write-up, Ryan. I like how it's pretty objective. - O.W. Kenobi 2005-06-02 13:20:24 (325 views)

2nd Very nice, Ryan! - Pat-SoCal 2005-06-02 13:43:12 (300 views)

3rd, excellent write-up! - ryoung 2005-06-02 22:11:46 (246 views)

with all that being said, I run 6 piston Alcon's... - ryans4 2005-06-02 13:23:34 (271 views)

I run 4-piston Alcons and I would agree that Alcon is the best brake setup for the S4. - NO.BRAZIL 2005-06-02 14:04:28 (330 views)

Thanks for the thread... I was writing you an e-mail when I saw it :P Here we go: - Pat-SoCal 2005-06-02 12:36:36 (684 views)

And to shock Most people here I agree on the "STOPTECH ROCKS" comment - Eric Fletcher 2005-06-02 18:35:34 (416 views)

thanks bro!!! appreciate the info, man more suspension/brake porn :) - Milpitas2.7T 2005-06-02 13:23:29 (354 views)

SKIP the Tilton Master Cylinder... - ryans4 2005-06-02 13:10:40 (321 views)

Yes, I know. Not my car though. - Pat-SoCal 2005-06-02 13:44:39 (319 views)

a year? on a tilton MC? that was downright optimistic. - ryans4 2005-06-02 13:52:53 (241 views)

reasoning you stuck with the 332s? - internecine 2005-06-02 12:51:16 (333 views)

I don't believe there is a necessity for a larger rotor. - Pat-SoCal 2005-06-02 12:57:14 (323 views)

so brake fade wouldent be decreased significantly with a larger rotor? - internecine 2005-06-02 13:03:45 (277 views)

I doubt I'll run into that problem on my car. - Pat-SoCal 2005-06-02 13:41:10 (320 views)

that's really a pad thing... - ryans4 2005-06-02 13:12:24 (427 views)

so why have 370mm rotors? - internecine 2005-06-02 13:18:06 (258 views)

leverage and efficiency increase... - ryans4 2005-06-02 13:20:46 (230 views)

I happy with StopTech fronts and Stasis rears... - Tomasz@StartupRacing 2005-06-02 11:56:48 (452 views)

Same setup as I have. Although I need new rotors and would rather stay away from that Coleman crap - Eric Fletcher 2005-06-02 18:20:46 (305 views)

So what rotor are you going to get? - Tomasz@StartupRacing 2005-06-02 18:49:34 (311 views)

I'm looking at options - Eric Fletcher 2005-06-02 19:14:30 (309 views)

Well... brakes and oil cooler. - Tomasz@StartupRacing 2005-06-03 10:55:18 (269 views)

Naahhh Many yers ago I built a big brake kit for the 5000TQ and 200's (Type 44 cars) - Eric Fletcher 2005-06-03 10:58:39 (380 views)

" I would not recommend it for street use. " the 332 kit, why is that? - Milpitas2.7T 2005-06-02 12:17:40 (268 views)

I believe he means street use *only* as that would be a waste. - DocSlow (Mini P!g) 2005-06-02 12:18:42 (274 views)

Yes! - Tomasz@StartupRacing 2005-06-02 13:29:32 (237 views)

I used the axxis pads on the track (very small track) recently. - DocSlow (Mini P!g) 2005-06-02 11:58:50 (228 views)

How are your brakes now? I ruined a set of rotors - pad material transfer. - Tomasz@StartupRacing 2005-06-02 12:12:01 (344 views)

I had major vibrations under light braking for a while. It's been ~2 weeks now and they seem okay. - DocSlow (Mini P!g) 2005-06-02 12:13:33 (256 views)

Start saving for new rotors... you will see. - Tomasz@StartupRacing 2005-06-02 13:30:35 (375 views)

Pat has Stoptechs on his car. Good enough for him, good enough for me. :) - DocSlow (Mini P!g) 2005-06-02 11:49:02 (272 views)

Ya but think he went thru a few iterations. 355's front and custom rear, now? or other - Milpitas2.7T 2005-06-02 11:55:17 (371 views)

good topic, i've been considering new brakes lately. I'd love to hear what our AW 'pros' recommend - mjtaylor 2005-06-02 11:49:00 (366 views)

ECS stage III has been great for me so far. 17 track days on them so far... - O.W. Kenobi 2005-06-02 11:54:29 (420 views)

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