 How to reset brake pressure warning switch? |
|
|
|
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. |
|
|
| andreic |
 Jun 29 2021, 09:15 AM
Post
#1
|
|
Member  Group: Members Posts: 172 Joined: 21-December 15 From: Madison, WI Member No.: 19,479 Region Association: Upper MidWest  |
I have a 1972 914 1.7L with the original master cylinder. After a lot of adventures with the brakes two years ago I replaced the front calipers and the brakes have been working great since then.
However about a year ago I noticed an intermittent clicking of one of the relays, like the one for the turn signals, just less frequent and less regular. It might click every few seconds. No light comes on the dash. After a lot of diagnosing I traced it down to the brake pressure warning switch on the master cylinder. If I disconnect the line going to the switch, the clicking stops. My guess is that somehow the switch was left over in some intermediate stage where it is neither on (when it would turn the red warning light and blink vigorously) or off. At the time I tried to clean off the gunk around it and to reset it. The cleaning seemed to help (it stopped clicking for a few months, but now it's come back) but I cannot for the life of me figure out what needs to be done to reset it. There is a little black button-like thing, between two copper vertical bars. There does not seem to be a way to push the button in any more. Any suggestions short of replacing the switch? I don't want to have to deal with the hassle of needing to bleed all four brakes all over, etc. Thanks. |
   |
 
|
  |
Replies
| 914_teener |
Jul 9 2021, 02:21 PM
Post
#2
|
|
914 Guru Group: Members Posts: 5,250 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Some on 73 and earlier are not resetable.
There are more that several possibilities on the circuit. The German engineers were VERY efficient on the grounds. Read: http://www.914world.com/bbs2/index.php?sho...88745&st=20 Get out your DVM and start on the OHMS setting. Otherwise you'll be just quessing it's always the switch the MUST be faulty. Keep us posted. |
|
|
|
Posts in this topic
andreic How to reset brake pressure warning switch? Jun 29 2021, 09:15 AM
bdstone914 Use a small wood dowel as a punch and tap on it. I... Jun 29 2021, 10:04 AM andreic Thanks! I will try that and let you know how i... Jun 29 2021, 10:21 AM andreic I took the big metal cover off now to try to tap o... Jul 8 2021, 07:21 PM andreic Bump. Bdstone914? Jul 9 2021, 12:08 PM 914_teener Two things:
You may have reversed the leads....or... Jul 9 2021, 12:56 PM
trick-e I’ve a similar issue, for a ‘75, and have a qu... Jul 10 2021, 07:26 AM andreic I had not touched the leads before it started clic... Jul 9 2021, 01:06 PM |
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 28th December 2024 - 02:16 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.