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 )

 
 Reply to this topicStart new topic
> Brake help.., Need a different opinion than my own.
ClayPerrine
post Sep 1 2019, 08:47 PM
Post #1


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,540
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
I am having problems getting the brakes to bleed on my big six. It has Boxster calipers, a 23mm master cylinder, and no proportioning valve. I can't seem to get a pedal. After about 3 pumps of the pedal, it comes up and there is decent pressure. But the minute you let off completely, it will go to the floor the next time the pedal is depressed. I have put over 2 liters of fluid through the system already, using both a power bleeder and Betty's right leg. Fluid is ATE Dot4 gold.


This is the same setup I ran on it for years. It has always had good pedal, no issues with bleeding it either.

Anyone got any suggestions on what might be wrong?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bdstone914
post Sep 1 2019, 09:22 PM
Post #2


bdstone914
****

Group: Members
Posts: 4,542
Joined: 8-November 03
From: Riverside CA
Member No.: 1,319
Bad seals in the master cylinder?
If it sat dry for a long time the seals may have got stiff.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Retroracer
post Sep 1 2019, 09:31 PM
Post #3


Senior Member
***

Group: Members
Posts: 617
Joined: 7-July 13
From: Bend OR
Member No.: 16,100
Region Association: Pacific Northwest
You are using both bleed nipples (inner and outer) on the Boxster calipers I assume? Also - the rear brake lines have a "high spot" with standard pipe routing that just wants to trap air - even with no proportioning valve. Some creative angling of the car with jacks/axle stands can sometimes help when bleeding - good luck

- Tony
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type2man
post Sep 1 2019, 09:33 PM
Post #4


Member
**

Group: Members
Posts: 353
Joined: 3-March 09
From: Miami, Fl
Member No.: 10,127
Region Association: South East States
You bled the brakes for no other reason than to have fresh brake fluid or did you replace parts?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ClayPerrine
post Sep 1 2019, 09:40 PM
Post #5


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,540
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
QUOTE(bdstone914 @ Sep 1 2019, 10:22 PM) *

Bad seals in the master cylinder?
If it sat dry for a long time the seals may have got stiff.


The master cylinder is new.


QUOTE(type2man @ Sep 1 2019, 10:33 PM) *

You bled the brakes for no other reason than to have fresh brake fluid or did you replace parts?


I had to remove the master cylinder to weld in a mount for the clutch master cylinder. Put a new master cylinder back in when I was done.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ClayPerrine
post Sep 1 2019, 09:44 PM
Post #6


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,540
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
QUOTE(Retroracer @ Sep 1 2019, 10:31 PM) *

You are using both bleed nipples (inner and outer) on the Boxster calipers I assume? Also - the rear brake lines have a "high spot" with standard pipe routing that just wants to trap air - even with no proportioning valve. Some creative angling of the car with jacks/axle stands can sometimes help when bleeding - good luck

- Tony


I completely forgot about the inner bleeders. That's how I can get rid of the air!!!


Now I feel really stupid! (IMG:style_emoticons/default/slap.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Retroracer
post Sep 2 2019, 08:23 AM
Post #7


Senior Member
***

Group: Members
Posts: 617
Joined: 7-July 13
From: Bend OR
Member No.: 16,100
Region Association: Pacific Northwest
Clay - make sure that fixes the issue before giving yourself a hard time!

- Tony
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Sep 2 2019, 09:28 AM
Post #8


I. I. R. C.
*****

Group: Members
Posts: 6,732
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None
Put a tire valve on an old reservoir cap to make a pressure bleeder
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ClayPerrine
post Sep 2 2019, 10:57 AM
Post #9


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,540
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
I got it solved this morning. Bleeding BOTH bleeders on the calipers means I get all the air out of them. They work much better now.

And I am stupid.... (IMG:style_emoticons/default/slap.gif) (IMG:style_emoticons/default/chair.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Sep 2 2019, 01:43 PM
Post #10


Advanced Member
****

Group: Members
Posts: 4,707
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
QUOTE(ClayPerrine @ Sep 2 2019, 03:44 PM) *

QUOTE(Retroracer @ Sep 1 2019, 10:31 PM) *

You are using both bleed nipples (inner and outer) on the Boxster calipers I assume? Also - the rear brake lines have a "high spot" with standard pipe routing that just wants to trap air - even with no proportioning valve. Some creative angling of the car with jacks/axle stands can sometimes help when bleeding - good luck

- Tony


I completely forgot about the inner bleeders. That's how I can get rid of the air!!!


Now I feel really stupid! (IMG:style_emoticons/default/slap.gif)


Don't feel bad I did the same with my Brembo's...had exactly the same condition you have,mine came right straight away,besides that issue I have no other problems front or rear,good luck.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
raynekat
post Sep 2 2019, 10:52 PM
Post #11


Advanced Member
****

Group: Members
Posts: 2,159
Joined: 30-December 14
From: Coeur d'Alene, Idaho
Member No.: 18,263
Region Association: Pacific Northwest
I'm another ignoramus. Did the same thing just a couple of days ago. Tried bleeding the brakes and got nice bubble free fluid coming out of each caliper.
Yet no brake pedal. Dang air in the system somewhere....either the master of the P/V I thought.

A friend stopped by yesterday and while I was showing him the car, he noted "you bleeding the brakes?"
Yeah, but I can't get a brake pedal.
So he helped me to quickly go through the procedure again.
When we got to the front brakes and I had bled the 1st side, he asked me if that was the inner or outer bleed valve?
Inner or outer? Oh boogers!
Yeah, these dang S calipers do have inner bleed valves don't they....
Son of a gun.

Long story short, both front inner bleed valves were holding back some air.
Once bled out, I finally had a firm brake pedal.

Sometimes you can't see the forest for the trees....or is it the other way around?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

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

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 16th June 2024 - 11:16 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...