Brake performance is declining..., pedal is losing its stiffness |
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Brake performance is declining..., pedal is losing its stiffness |
Aaron Cox |
Apr 4 2005, 11:06 AM
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#1
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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 |
ok... so my pedal was uber firm 3 months ago.....and just the other day i dont feel all that confident in my braking ability...i mean it stops... but the pedal is no where near as firm as it used to be....
resevoir is full.... no leaks....anywhere 6 month old SS lines..... PO's 19mm MC rebuilt M calipers and non leaking and one rebuilt rear caliper.... is my MC dying a slow and scary death? i like my pedals rock firm.... oh...btw i KNOW in the future i will be using 986 brakes..... can i use a 19mm MC with those? or will i have to buy a new one at that time (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) |
SLITS |
Apr 4 2005, 11:08 AM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Get some of Scott's Viagra....he says take two and it'll be stiff again....... (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif)
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tat2dphreak |
Apr 4 2005, 11:19 AM
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#3
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
bleed 'em!
and bleed the prop. valve. how old if the fluid? what kind of fluid? |
Aaron Cox |
Apr 4 2005, 11:21 AM
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#4
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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 |
castrol super dot 4 fluid..... 6 month old fluid.... (IMG:http://www.914world.com/bbs2/html/emoticons/mad.gif) |
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URY914 |
Apr 4 2005, 11:23 AM
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#5
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I built the lightest 914 in the history of mankind. Group: Members Posts: 122,935 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Let it BLEED!!
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Aaron Cox |
Apr 4 2005, 11:26 AM
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#6
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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 |
tis my plan..... i have no knowledge of how old the master cylinder is..... i used a mirror to see that it is a 19mm......... how would air have gotten in to the sytem? no leaks.... resevoir is always full.... oh well.... |
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nebreitling |
Apr 4 2005, 11:26 AM
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#7
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
bleed and find out.
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nickg |
Apr 4 2005, 11:56 AM
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#8
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Senior Member Group: Members Posts: 501 Joined: 30-August 04 From: franklin, nj Member No.: 2,652 |
did you try levitra? (IMG:http://www.914world.com/bbs2/html/emoticons/mueba.gif) and remember if your pedal stays hard for longer than 4 hours....consult a dr (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif)
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Type 4 |
Apr 4 2005, 12:06 PM
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#9
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Member Group: Members Posts: 412 Joined: 30-September 04 From: Costa Mesa Calif. Member No.: 2,866 |
How old are the Hoses?
You may have a hose that is failing, look for blisters on the hoses. |
Eric_Shea |
Apr 4 2005, 12:11 PM
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#10
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PMB Performance Group: Admin Posts: 19,288 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
I smell money... (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
I'm pretty sure you need all new brakes on that car Chimp (IMG:http://www.914world.com/bbs2/html/emoticons/w00t.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif) |
Eric_Shea |
Apr 4 2005, 12:12 PM
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#11
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PMB Performance Group: Admin Posts: 19,288 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Seriously... you're getting air in there somewhere. Everything tight?
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SLITS |
Apr 4 2005, 12:19 PM
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#12
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
with s/s lines, they won't blister...they'll leak |
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Aaron Cox |
Apr 4 2005, 12:19 PM
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#13
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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 |
steve....
hoses are six months old. brand new stainless lines at the time.... all fittings are tight.....but i will go double check them..... i smell a bleeding brakes BBQ! (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) what does a failing mastecylinder feel like? |
lapuwali |
Apr 4 2005, 12:24 PM
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#14
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
At a stop, mash the brake pedal HARD and hold it down. If it slowly sinks, then you very likely have an MC leak. Have you checked under the carpet at the pedal cluster? MCs frequently leak down the pedal pushrod, and get brake fluid all over the floor under the carpet.
Water or air getting into the system will cause mushiness. Non-silicone brake fluid likes water, so over time, it will absorb atmospheric water however it can, such as through the reservior vent hole. Usually this process takes a couple of years to show up, but it can happen faster if it's been exceptionally humid recently. |
Eric_Shea |
Apr 4 2005, 12:27 PM
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#15
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PMB Performance Group: Admin Posts: 19,288 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Check your pedal assembly... if your M/C is going South you'll probably see it there first. This is how it felt on the -6 last spring before I rebuilt everything. I had brakes but... they had to be pumped and if you pumped hard enough they went down fast. The tray was full of fluid.
Yank the carpet and pull the board. Stick your finger in the tray and see if it's damp. |
Eric_Shea |
Apr 4 2005, 12:29 PM
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#16
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PMB Performance Group: Admin Posts: 19,288 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
Does water compress more than brake fluid? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
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Grimstead |
Apr 4 2005, 12:58 PM
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#17
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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 |
Hey Aaron,
My brake leg is in good shap if you need some help (IMG:http://www.914world.com/bbs2/html/emoticons/rocking nana.gif) Bill |
Aaron Cox |
Apr 4 2005, 01:00 PM
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#18
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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 |
roger that..... im like 5 miles from you...sefas club/green river (sierra del oro) ill let you know... thanks bill |
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Eric_Shea |
Apr 4 2005, 01:31 PM
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#19
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PMB Performance Group: Admin Posts: 19,288 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
I thought about that today when I sent Bill calipers off to him. I was wondering how close you were to each other.
Bill seems like a very nice guy... don't be corrupting him Aa-ron (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif) |
Aaron Cox |
Apr 4 2005, 01:33 PM
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#20
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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 |
(IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) you know me eric..... yeah, i wish he could joined us at the ginormous BBQ on saturday...... |
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