Heavy braking scares me, It doesn't lock up |
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Heavy braking scares me, It doesn't lock up |
911GT2 |
Jul 3 2020, 02:32 AM
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#1
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Member Group: Members Posts: 195 Joined: 2-March 11 From: The Netherlands Member No.: 12,773 Region Association: Europe |
I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels.
Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? |
ChrisFoley |
Jul 3 2020, 06:02 AM
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#2
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I am Tangerine Racing Group: Members Posts: 7,894 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
1) pads with higher COF
2) master cylinder brace (to prevent firewall flex) 3) adjust rear brake regulator 4) adjust pedal free play and rear venting clearance |
wndsrfr |
Jul 3 2020, 06:06 AM
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#3
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Senior Member Group: Members Posts: 1,427 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? Install new OEM rubber flex lines.... |
Mark Henry |
Jul 3 2020, 06:25 AM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
First I'd try moving the seat up one notch and remember it has no power assist so you do have to push fairly hard.
-If you have no clue if the brake line hoses have ever been replaced now's the time, the inside of old hose swells shut. When bleeding if you have an extraordinarily small amount of fluid being bled is a sure sign that the hose has swelled shut. Weak brakes like you describe and dragging brakes are also signs of bad hoses. -another cause is the rear calipers venting set incorrectly. -Bad calipers,pads rotors, etc. Our cars don't see a lot of road time. but that's not an excuse not to bleed the brakes every couple of years. At most every 3-4 years. |
porschetub |
Jul 3 2020, 06:47 PM
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#5
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Advanced Member Group: Members Posts: 4,695 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? Do a "vacuum suck out'' and get the old stuff out,better than doing a "pedal pump" out as you avoid moving shit around the system,the master cylinder generally suffers most and the cups can get torn up. You should get a result if every other thing is good,otherwise you may find the m/cylinder is leaking by causing a soft pedal,it kinda feels like air in the system but its not. If no luck you need to look @ a R&R of the master cylinder,good luck. |
ClayPerrine |
Jul 3 2020, 09:41 PM
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#6
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Life's been good to me so far..... Group: Admin Posts: 15,369 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
I suggest you change the flex lines, check the venting clearance, and check the proportioning valve on the firewall. If it is not working correctly, it can cause spongy brakes. So get it rebuilt to be sure.
Contact the Sultan of stopping, @Eric_Shea about the rebuild of the prop valve. |
911GT2 |
Jul 5 2020, 06:08 AM
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#7
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Member Group: Members Posts: 195 Joined: 2-March 11 From: The Netherlands Member No.: 12,773 Region Association: Europe |
Thanks guys! (IMG:style_emoticons/default/beerchug.gif)
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Baumgardner |
Jul 5 2020, 06:39 AM
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#8
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Newbie Group: Members Posts: 34 Joined: 2-May 20 From: Cincinnati, Ohio Member No.: 24,213 Region Association: Upper MidWest |
I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? Been wondering about changing front brake calipers to an upgrade to BMW 320i... Article: https://www.pelicanparts.com/techarticles/9...MW_calipers.htm |
porschetub |
Jul 5 2020, 06:03 PM
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#9
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Advanced Member Group: Members Posts: 4,695 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
[quote name='Baumgardner' date='Jul 6 2020, 12:39 AM' post='2831108']
[quote name='911GT2' post='2830480' date='Jul 3 2020, 04:32 AM'] I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? [/quote] Been wondering about changing front brake calipers to an upgrade to BMW 320i... Many say it isn't an upgrade,general consensus is people don't bother doing this conversion The stock brakes in good condition are very good. |
ConeDodger |
Jul 5 2020, 06:33 PM
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#10
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Apex killer! Group: Members Posts: 23,543 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
Over the years, a lot of rear brake regulators got removed and replaced with a brass tee by geniuses who think they know everything...
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Baumgardner |
Jul 6 2020, 08:07 AM
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#11
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Newbie Group: Members Posts: 34 Joined: 2-May 20 From: Cincinnati, Ohio Member No.: 24,213 Region Association: Upper MidWest |
[quote name='porschetub' date='Jul 5 2020, 08:03 PM' post='2831256']
[quote name='Baumgardner' date='Jul 6 2020, 12:39 AM' post='2831108'] [quote name='911GT2' post='2830480' date='Jul 3 2020, 04:32 AM'] I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? [/quote] Been wondering about changing front brake calipers to an upgrade to BMW 320i... Many say it isn't an upgrade,general consensus is people don't bother doing this conversion The stock brakes in good condition are very good. [/quote] I haven't heard otherwise, so you could very well be correct about that upgrade. I think a lot of the "braking" concerns are the natural reaction to the hyper sensitive power brakes on more modern cars. If you haven't driven a 914 in a long time, your first reaction on braking in a 914 might be "my god, my brakes don't work" as your life flashes before your eyes. (IMG:style_emoticons/default/driving-girl.gif) |
michael7810 |
Jul 6 2020, 08:40 AM
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#12
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Senior Member Group: Members Posts: 1,078 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region |
[quote name='Baumgardner' date='Jul 6 2020, 07:07 AM' post='2831387']
[quote name='porschetub' date='Jul 5 2020, 08:03 PM' post='2831256'] [quote name='Baumgardner' date='Jul 6 2020, 12:39 AM' post='2831108'] [quote name='911GT2' post='2830480' date='Jul 3 2020, 04:32 AM'] I've read over and over here that the stock brakes are sufficient and that the stock brakes should able to lock up the four wheels. Although my car slows down, I can not get it to lock up. Even so, even considering the age of the car I think brakes are quite poor. I've got 205 tires so it's not about lack of grip, but on the pedal the end feels quite soft. I've checked the lines, they are all good so only thing I can think of is moisture in the lines. So after a flush, what's next, a more aggressive pad? Which one would be recommended? [/quote] Been wondering about changing front brake calipers to an upgrade to BMW 320i... Many say it isn't an upgrade,general consensus is people don't bother doing this conversion The stock brakes in good condition are very good. [/quote] I haven't heard otherwise, so you could very well be correct about that upgrade. I think a lot of the "braking" concerns are the natural reaction to the hyper sensitive power brakes on more modern cars. If you haven't driven a 914 in a long time, your first reaction on braking in a 914 might be "my god, my brakes don't work" as your life flashes before your eyes. (IMG:style_emoticons/default/driving-girl.gif) [/quote] Push harder Michael, she’ll stop (IMG:style_emoticons/default/driving.gif) |
Root_Werks |
Jul 6 2020, 09:31 AM
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#13
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Village Idiot Group: Members Posts: 8,288 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest |
As others have said, start with the cheap stuff:
New stock rubber lines (Not SS lines unless you know how to preload them) Adjust rear pad clearance Flush the brake fluid if you can After those two things, see how the brakes feel. |
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