Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
Reply to this topicStart new topic
> STILL NO BRAKES!
JHop
post Feb 14 2017, 06:59 PM
Post #1


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Feb 14 2017, 07:21 PM
Post #2


Senior Member
***

Group: Members
Posts: 1,726
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None



Have you bleed off the calipers in the correct order i.e.furtherest to nearest from the m/c /,what brand of m/c did you buy?,is your brake pedal adjusted for correct stroke?.
Have you replaced the brake fluid,old shity stuff can wear out new parts in no time...ask me how I know.
Whole bunch of questions I know but I'am not in your garage to see whats going on.
Good luck.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JHop
post Feb 14 2017, 07:27 PM
Post #3


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



QUOTE(porschetub @ Feb 14 2017, 05:21 PM) *

Have you bleed off the calipers in the correct order i.e.furtherest to nearest from the m/c /,what brand of m/c did you buy?,is your brake pedal adjusted for correct stroke?.
Have you replaced the brake fluid,old shity stuff can wear out new parts in no time...ask me how I know.
Whole bunch of questions I know but I'am not in your garage to see whats going on.
Good luck.


Hey there! Yeah, I did the correct order...not sure about the brake pedal...all new fluid. have an ATE MC...

Would it make sense to check the venting on the rears again? I'm so frustrated, I'm about to cave in and get it towed to my indy....I just want to fix it myself...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
wndsrfr
post Feb 14 2017, 08:46 PM
Post #4


Senior Member
***

Group: Members
Posts: 778
Joined: 30-April 09
From: Rescue, Virginia
Member No.: 10,318
Region Association: MidAtlantic Region



QUOTE(JHop @ Feb 14 2017, 04:59 PM) *

Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)

Did you "bench bleed" the MC before installing....if not, do it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Feb 14 2017, 08:50 PM
Post #5


914-6 GT in waiting
*****

Group: Members
Posts: 8,286
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region



QUOTE(wndsrfr @ Feb 14 2017, 09:46 PM) *

QUOTE(JHop @ Feb 14 2017, 04:59 PM) *

Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)

Did you "bench bleed" the MC before installing....if not, do it.

Or crack the lines at the MC.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
stugray
post Feb 14 2017, 11:44 PM
Post #6


Advanced Member
****

Group: Members
Posts: 3,762
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None



Do you have the calipers installed where the bleeders are at the top of the calipers?

And if you have any calipers with two bleeders, you are using the top ones?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JHop
post Feb 14 2017, 11:46 PM
Post #7


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



QUOTE(mepstein @ Feb 14 2017, 06:50 PM) *

QUOTE(wndsrfr @ Feb 14 2017, 09:46 PM) *

QUOTE(JHop @ Feb 14 2017, 04:59 PM) *

Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)

Did you "bench bleed" the MC before installing....if not, do it.

Or crack the lines at the MC.

Are you thinking I have air in the MC? Another thing...my brake lights are now on the minute I fire the car up...any clue? never seen that before.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JHop
post Feb 14 2017, 11:49 PM
Post #8


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



QUOTE(stugray @ Feb 14 2017, 09:44 PM) *

Do you have the calipers installed where the bleeders are at the top of the calipers?

And if you have any calipers with two bleeders, you are using the top ones?


Yes, the rears have the two bleeders, and I've only used the top ones...still no pedal at all.

Man, I just want to be able to drive this car...it's killing me. If there is anyone in the Portland, OR area that can help me I'll be forever grateful!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
dlee6204
post Feb 15 2017, 06:45 AM
Post #9


Howdy
***

Group: Members
Posts: 1,868
Joined: 30-April 06
From: Burnsville, NC
Member No.: 5,956
Region Association: South East States



QUOTE(JHop @ Feb 15 2017, 12:46 AM) *

QUOTE(mepstein @ Feb 14 2017, 06:50 PM) *

QUOTE(wndsrfr @ Feb 14 2017, 09:46 PM) *

QUOTE(JHop @ Feb 14 2017, 04:59 PM) *

Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)

Did you "bench bleed" the MC before installing....if not, do it.

Or crack the lines at the MC.

Are you thinking I have air in the MC? Another thing...my brake lights are now on the minute I fire the car up...any clue? never seen that before.


We are absolutely thinking you have air in the system. So did you crack the lines at the master cylinder and bleed it? The brake light being on is likely a simple fix of the actuating rod engaging the brake switch at the pedal cluster.

Typically on a new system, the very first thing I do is crack one of the lines at the MC and pump the pedal until fluid comes out. I close one line and crack the other and repeat. After bleeding both lines at the MC, I then crack one line after the proportion of valve and pump til fluid comes out. I then proceed to all four wheels and bleed. I drive the car and then bleed again. Seems to work pretty well.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JHop
post Feb 15 2017, 08:45 AM
Post #10


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



QUOTE(dlee6204 @ Feb 15 2017, 04:45 AM) *

QUOTE(JHop @ Feb 15 2017, 12:46 AM) *

QUOTE(mepstein @ Feb 14 2017, 06:50 PM) *

QUOTE(wndsrfr @ Feb 14 2017, 09:46 PM) *

QUOTE(JHop @ Feb 14 2017, 04:59 PM) *

Gents,

I have done the searches, watched some video, looked up stuff, rebuilt my calipers, replaced the MC, soft brake lines, and some hard lines, new pads and hardware, adjusted the venting clearance on the rear pads, speed bleeders...probably going on about $600 all in on this brake system so far...bled , then bled, then bled some more using a pressure bleeder...still a soft pedal and red blinky brake dash light when the pedal goes to the floor. I tried to do the pedal bleed, but it didn't seem like the fluid was moving. When I switched to the pressure bleeder, the fluid started coming out...no air bubbles.

What am I missing? Adjust the venting again? If I did that wrong, does it screw up the whole system? Car runs, is looking good...needs to STOP. (IMG:style_emoticons/default/headbang.gif)

Did you "bench bleed" the MC before installing....if not, do it.

Or crack the lines at the MC.

Are you thinking I have air in the MC? Another thing...my brake lights are now on the minute I fire the car up...any clue? never seen that before.


We are absolutely thinking you have air in the system. So did you crack the lines at the master cylinder and bleed it? The brake light being on is likely a simple fix of the actuating rod engaging the brake switch at the pedal cluster.

Typically on a new system, the very first thing I do is crack one of the lines at the MC and pump the pedal until fluid comes out. I close one line and crack the other and repeat. After bleeding both lines at the MC, I then crack one line after the proportion of valve and pump til fluid comes out. I then proceed to all four wheels and bleed. I drive the car and then bleed again. Seems to work pretty well.

Thanks for the help guys! I'll try the above and take a look at the actuating rod as well. I'll let you know what happens. I've done a bunch of MC exchanges before, but this one has just been a real challenge!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomeric914
post Feb 15 2017, 09:37 AM
Post #11


One Lap of America in a 914!
***

Group: Members
Posts: 1,107
Joined: 25-May 08
From: Syracuse, NY
Member No.: 9,101
Region Association: North East States



Check your brake hoses. If they are 40+ years old, they will be constricted.

I ran across a situation recently where the internal bleed passageway down to one side of the caliper bores was blocked with crud/rust so only one side of the caliper was able to bled. The result was spongy to no brakes.

I had to split the caliper and run a wire or very small drill through the passageway to clear it out. With the passageway clear, the brakes bled normally and I had a solid pedal.

While the image below is of a bicycle caliper, the idea of the passageways is similar to how our calipers passageways are run. If they aren't clear, the caliper won't bleed.

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.bikerumor.com-9101-1487173057.1.jpg)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
6freak
post Feb 15 2017, 11:02 AM
Post #12


MR.C
****

Group: Members
Posts: 4,736
Joined: 19-March 08
From: Tacoma WA
Member No.: 8,829
Region Association: Pacific Northwest



i recalL someone saying something along the lines of .. if you push the peddle to far down you can damage an o ring or seal in the M/C IIRC there for not being able to build pressure good luck (IMG:style_emoticons/default/smile.gif) IMO its the M/C
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Feb 15 2017, 12:05 PM
Post #13


I'm a 914
***************

Group: Admin
Posts: 19,460
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: North East States



You absolutely, undeniably MUST bleed the master cylinder before hooking up your brake lines. This can be done on a bench or it can be done in the car.

You need three caps to plug the outlet lines on the MC. You can make these by getting some cheap bubble-flare brake lines from your local auto parts store. Cut the ends off, crimp the cut end of the hardline, the heat with a torch and drop some plumbing solder down the tube. Viola! Brake line plug.

Make three of those and install them in the outlet ports of the MC. Then just pump the pedal until is gets ROCK solid. Not kinda solid. Not mostly solid. Not a little bit firm. Keep going until it's SOLID. (well there may be a bit of free play at the top/initial movement depending on how your pedal plunger is adjusted).

Once the MC is solid, have someone sit in the car and press the pedal and keep it down while you remove the plugs and install the real brake lines. With the pedal down the fluid from the reservoir won't spill all over.

Or for an even better bleeding experience, hook up just the rear lines first, leave the caps in the front and bleed the rears until they're rock solid. Then add one of the fronts and bleed that until rock solid. Then add the last front and finish bleeding.

It's a pain in the ass, but you're driving yourself crazy because you're doing it completely wrong. Take a break ((IMG:style_emoticons/default/laugh.gif)) and then come back and attack it correctly.

You can do it. (IMG:style_emoticons/default/thumb3d.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Feb 15 2017, 12:26 PM
Post #14


I'm a 914
***************

Group: Admin
Posts: 19,460
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: North East States



Wrote up a tutorial on building the brake line plugs you need.
http://www.914world.com/bbs2/index.php?showtopic=304882
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Feb 15 2017, 12:28 PM
Post #15


Jerry
*****

Group: Members
Posts: 5,339
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031



QUOTE(JHop @ Feb 15 2017, 12:46 AM) *

Another thing...my brake lights are now on the minute I fire the car up...any clue? never seen that before.


This may be a clue to why you have no brakes. This means your brake pedal is always depressed. It might be the mechanical connection between the pedal and the MC. Have you taken the pedal board out and inspected the connection from the pedal to the MC?

When the pedal board is out, you can see the brake switch which lights the brake lights. There may be an adjustment necessary or something isn't lined up properly.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Feb 15 2017, 02:06 PM
Post #16


914 Idiot
**********

Group: Members
Posts: 12,927
Joined: 9-January 03
From: Silly-con Valley, CA
Member No.: 121
Region Association: Northern California



The brake lights are triggered by a switch on the pedal cluster. The switch is spring-loaded in the "brake lights on" position. The switch is pressed by a washer on the pushrod that goes from the pedal to the master cylinder; when the pedal comes back up it pushes on the arm of the switch and breaks the circuit turning the brake lights off.

It is easy to get the arm of the switch on the wrong side of the washer, which will lead to brake lights on all the time.

The brake warning light coming on is happening because the pedal is going to the floor. That's one of the functions of the warning light.


You still have air in the system somewhere, or fluid is bypassing the seals somewhere in the system.

Brake lines will not cause you to have no pedal unless they are letting air in, at which point they will also be letting fluid out and you'll generally find leaked-out fluid.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Feb 15 2017, 02:59 PM
Post #17


Senior Member
***

Group: Members
Posts: 1,940
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States



I bet the MC has a split seal. New or not it sounds like the MC is not building pressure. I had the same issue. Searched everywhere, fixed everything. Took the MC out. Took it apart and there is was. Mine was a 17mm so I could not find parts. Just bought another.

Won't hurt to take it apart and look at it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
The Cabinetmaker
post Feb 15 2017, 03:57 PM
Post #18


I drive my car everyday
*****

Group: Members
Posts: 7,370
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666



What brand, and where did you buy said master cylinder? I put 4 master cylinders on my truck before I got one that worked.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
JHop
post Feb 15 2017, 10:22 PM
Post #19


Newbie
*

Group: Members
Posts: 25
Joined: 18-February 16
From: Portland, OR
Member No.: 19,685
Region Association: Pacific Northwest



QUOTE(The Cabinetmaker @ Feb 15 2017, 01:57 PM) *

What brand, and where did you buy said master cylinder? I put 4 master cylinders on my truck before I got one that worked.


Bought the MC from local import auto place that specializes in VW/Porsche. FTE was what it said on the box...I hope I'm not going through that many... (IMG:style_emoticons/default/sad.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jsaum
post Feb 16 2017, 09:51 PM
Post #20


Member
**

Group: Members
Posts: 405
Joined: 12-June 07
From: Everett, WA
Member No.: 7,809
Region Association: None



QUOTE(JHop @ Feb 14 2017, 09:49 PM) *

QUOTE(stugray @ Feb 14 2017, 09:44 PM) *

Do you have the calipers installed where the bleeders are at the top of the calipers?

And if you have any calipers with two bleeders, you are using the top ones?


Yes, the rears have the two bleeders, and I've only used the top ones...still no pedal at all.

Man, I just want to be able to drive this car...it's killing me. If there is anyone in the Portland, OR area that can help me I'll be forever grateful!

And your front calipers have the bleeders on top too? It took me a week to figure out I had them on the wrong sides. I ran three large bottles of fluid through while trying to bleed the system. Once I switched them I had a firm pedal in minutes! Oh and I now have a really cleanly flushed out brake system! Hang in there you'll figure it out.
Jsaum
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 21st July 2017 - 04:44 PM