Horn sounds when I step on the brake |
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Horn sounds when I step on the brake |
scrz914 |
Jul 14 2006, 11:37 AM
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#1
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Member Group: Members Posts: 401 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
Not really... but something similar. When I step on the brake, it cuts the current to the guages. Gas, Tach, Speedo...they all shut off. I just bought this car and haven't dug into it yet. I was told by the po that someone had installed BMW brakes on the front. Maybe they also put in a 19mm master cylinder. Not sure.
Has anyone had this happen to them? Should I look at the master cylinder and check all the connections for a short circuit? Where else could the trouble be? I want to get this car ready to AX on the 30th, but the problem list seems to be getting bigger. It's good to be back in the 914 world tho. |
grantsfo |
Jul 14 2006, 11:50 AM
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#2
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Arrrrhhhh! Group: Members Posts: 4,327 Joined: 16-March 03 Member No.: 433 Region Association: None |
Not really... but something similar. When I step on the brake, it cuts the current to the guages. Gas, Tach, Speedo...they all shut off. I just bought this car and haven't dug into it yet. I was told by the po that someone had installed BMW brakes on the front. Maybe they also put in a 19mm master cylinder. Not sure. Has anyone had this happen to them? Should I look at the master cylinder and check all the connections for a short circuit? Where else could the trouble be? I want to get this car ready to AX on the 30th, but the problem list seems to be getting bigger. It's good to be back in the 914 world tho. Are all your fuses good? Funky stuff happens when all fuses arent good and in place sometimes. |
Dr Evil |
Jul 14 2006, 11:54 AM
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#3
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Send me your transmission! Group: Members Posts: 23,032 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
The break switch is a ground path for that circuit. Somehow your gauges are either getting power form that circuit or a ground. Time to reads the spaghetti (wiring diagram) and use your meter (IMG:style_emoticons/default/biggrin.gif)
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scrz914 |
Jul 14 2006, 01:54 PM
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#4
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Member Group: Members Posts: 401 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
QUOTE The break switch is a ground path for that circuit Yeh, sounds like the po may have miss wired something. I'll go through and check the diagram, cleanup connections, and put in new fuses. The car had sat for awhile so that doesn't help. Let the fun begin. (IMG:style_emoticons/default/smash.gif) |
BenT |
Jul 14 2006, 02:01 PM
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#5
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realty check casher Group: Members Posts: 103 Joined: 21-June 06 From: San Francisco Member No.: 6,273 Region Association: None |
I have a similar problem. Everytime some jerk pulls in front of me going 30 miles per hour slower.Horn goes off just as I hit the brakes. The steering wheels mysteriously jerks to the right; then to the left; followed by the universal salute. (IMG:style_emoticons/default/happy11.gif)
BenT |
Dave_Darling |
Jul 14 2006, 02:11 PM
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#6
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914 Idiot Group: Members Posts: 15,051 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Fuse. I forget which one, probably #8 or #9. Pull each fuse out (one at a time so you can get them back in the right spots!!) and inspect it. Betcha one of 'em falls apart while you're removing it.
--DD |
eg914 |
Jul 14 2006, 04:45 PM
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#7
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Member Group: Members Posts: 319 Joined: 17-June 04 From: Elk Grove, CA Member No.: 2,223 Region Association: None |
It is almost deffinately fuse 8 or 9, though I don't remember which. I had this happen to me on the way home from work on day. You also don't have brake lights when this fuse goes!
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Brando |
Jul 14 2006, 05:59 PM
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#8
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
Your horn goes off when you hit the brakes? That's one hell of a practical joke...
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Rand |
Jul 14 2006, 06:21 PM
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#9
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Haha. I was thinking you should swap the wires and make it so the horn honks when you step on the gas!!
DAVE!! You pulled in that classic birthday photo for your avatar!! (IMG:style_emoticons/default/laugh.gif) Nice. I've been trying to compile a *complete* fuse chart for a while. So far, the best I have is this. |
BGman |
Jul 14 2006, 06:43 PM
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#10
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Greg Group: Members Posts: 87 Joined: 18-January 04 From: Owensboro, KY Member No.: 1,575 Region Association: None |
I had a similar thing happen- but it wasn't with those particular guages....
It came down to having some wires having worked their way between the floor plate which holds the pedal assembly (I had replaced the original wood w/ a metal one with semi-sharp edges) and then them shorting against the body of the car. Dunno if it could be a similar problem....worth a check. |
scrz914 |
Jul 14 2006, 11:07 PM
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#11
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Member Group: Members Posts: 401 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
This is what I did.
Took out all the fuses (oops, wish I had seen Dave's response first) and cleaned them. They're all pretty old, one in particular was corroded. I didn't have any spares to use so I will have to go buy new ones. Which brings me to this question: what fuse rating goes where? Is there a chart for this? I looked at the master cylinder and everything looked okay there. I did notice a red wire coming out of the same hole as the brake line to the back which was actually cloth wrapped (like a fuel line). This was not connected to anything. I'll try to get pix of this. Also, I noticed that the ground strap above the tranny came from the body down to the tranny ears. I thought this connected on top of the tranny. Anyways, the first step will be to get new fuses. Thanks for the responses. (IMG:style_emoticons/default/clap56.gif) |
Rand |
Jul 14 2006, 11:57 PM
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#12
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
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scrz914 |
Jul 15 2006, 12:04 AM
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#13
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Member Group: Members Posts: 401 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
Oh thanks. I can't believe I missed that. That will help.
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scrz914 |
Jul 15 2006, 01:34 PM
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#14
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Member Group: Members Posts: 401 Joined: 21-April 04 From: Santa Cruz, CA Member No.: 1,960 Region Association: Central California |
Just to update. I put in all new fuses per Rand's chart. This did the trick. Now the guages don't cut out when I step on the brakes. And bonus, I have turn signals. The only bad thing is that now the flasher unit won't stop clicking, no lights, just clicking. One thing leads to another.
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