 trouble with brake pressure, brake bleeding newb |
|
|
|
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. |
|
|
| Hammy |
 Jul 30 2006, 07:09 PM
Post
#1
|
|
mr. Wonderful  Group: Members Posts: 1,827 Joined: 20-October 04 From: Columbia, CA./ Tuolumne Member No.: 2,978 Region Association: Northern California  |
In the process of bleeding the brakes.
Recently replaced some brake hard lines and rubber lines in the rear. They all appear to be holding up and secure. What I am confused about is: After bleeding all 4 calipers twice, the pedal is still not hard until it is pumped a few times. Is this normal? Do I just need to bleed more until i get an immediate firm pedal? Or does it mean something else? I'm wondering if it's one of the lines I replaced in the rear, yet none are leaking. Do I need to bleed the Proportioning valve? If so, how do I do that? Also, when bleeding, I have the tube on the bleeders and I crack them open. How much am I supposed to crack them open? Wide open? Or slightly? When they're open pretty far, air gets sucked in from the outside of the tube. Also, sometimes I get some brake fluid dripping and not going into the tube, and sometimes a lot leaks outside the tube. Is this normal for brake bleeding? (IMG:style_emoticons/default/rolleyes.gif) Thanks. |
   |
 
|
  |
Replies
| John |
Jul 30 2006, 11:29 PM
Post
#2
|
|
member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
When I recently put my car back together (I had all the brake lines off/out), I had a similar problem to what you describe and I had just switched to a 19mm master cylinder to boot.
I kept the stock proportioning valve (which got drained when it was out of the car). I pressure bled my brakes twice before I obtained a reasonable stiff pedal. I pressure bled them and also ran the pedal down to the floor several times while bleeding the rear brakes. (This made the biggest difference and the biggest improvement). Each time I bled the brakes, I would run a quart through the calipers (mostly in the rears). If I had a do-over button, I would have replaced the proportioning valve with a "T" fitting and been done with it. (I have 911 SC calipers/rotors on all 4 corners). It is my firm belief that the stock proportioning valve (pressure limiter) somehow plays a role in the difficulty in getting a hard brake pedal after it drains of fluid. Once a firm pedal is achieved, it seems like it works fine, but until then, it is a PITA. just my $0.02 |
|
|
|
Posts in this topic
Hammy trouble with brake pressure Jul 30 2006, 07:09 PM
Hammy shameless :bump: Jul 30 2006, 10:23 PM wertygrog Im not an expert but I've done it and I'll... Jul 30 2006, 10:42 PM Hammy Thanks for the reply and encouragement Brent.
I h... Jul 30 2006, 11:13 PM
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 19th July 2025 - 07:39 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.