 Brake performance is declining..., pedal is losing its stiffness |
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| Eric_Shea |
 Apr 4 2005, 04:08 PM
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#41
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PMB Performance  Group: Admin Posts: 19,279 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains   |
twas my point in asking... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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| Joe Ricard |
Apr 4 2005, 08:40 PM
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#42
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
So I have a theory on brakes that progresively get worse.
THEY JUST DO THAT Since brake fluid is Hygroscopic (it absorbs water) heavy use of the brakes can make enough heat to turn the water into steam which when cools leaves air bubbles. 6 months is a long time for brake fluid. In my opinion. Hell I even bleed the Exporer brakes every 6 months. change fluid nearly every year. The 914 gets a bleed before every Autocross so thats once a month. Sometimes I get little bubbles sometimes not. But it is on the "nut & bolt check list" Stock early calipers with 17mm M/C. Seems to be better than 19mm. I like it. |
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| Eric_Shea |
Apr 4 2005, 09:24 PM
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#43
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PMB Performance Group: Admin Posts: 19,279 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Yeah, but didn't we determine in a previous thread that you were crazy? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) OK, OK...maybe with all that rain you Californicators have been having lately, some has made it's moist little way into Aaron's brake system and... I hope Joe's right... If so, it'll be slightly less expensive than a MC rebuild. I thought that six months was a short period of time but. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) |
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| mrihop |
Apr 4 2005, 10:08 PM
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#44
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Member Group: Members Posts: 265 Joined: 6-November 04 From: Pahrump, NV Member No.: 3,068 Region Association: None |
The moisture in the fluid hypothesis is interesting because I have also noticed the pedal being a bit mushier and it travels a little lower. I haven't checked if my MC is bad yet. I'll try to get a helper to bleed my brakes tomorrow if I have time. I've been adding DOT 4 to my system as I've bled the brakes in the past.
To check the MC, you don't need to be driving, you just hold down the pedal hard in the driveway, and if the pedal starts to fall, the MC is no good. Bleeding the brakes can be hazardous to the MC if you're not careful. If you press down much lower than you normally push for stopping hard, you'll run the piston in the MC past all the crap that has built up and ruin the unit. If you want to run bigger than 19mm in the future, you'll need a lot more foot pressure as you'll begin to loose the hydraulic advantage, but you'll also gain a lot more pedal feedback because every little bump in a caliper will be read by your leg. |
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| Grimstead |
Apr 6 2005, 02:09 PM
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#45
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Cheaky Monkey Group: Members Posts: 835 Joined: 20-March 05 From: Corona, Ca Member No.: 3,789 Region Association: Southern California |
(IMG:http://www.914world.com/bbs2/html/emoticons/icon_bump.gif)
Hey Aaron, So what's the 411 on this? I got my 19mm yesterday and will hopefully be putting it in this weekend, perfect time to work on yours.... Bill (IMG:http://www.914world.com/bbs2/html/emoticons/rocking nana.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/mueba.gif) |
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| Aaron Cox |
Apr 6 2005, 02:11 PM
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#46
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
well... i figure i will just bleed all 4 corners this weekend.....
all depends on college workload this week... keep me posted on what your upto tho.... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) MC's are a pita to install from what i hear.... (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) |
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