Flashing red brake warning on combo gauge, Photos added |
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Flashing red brake warning on combo gauge, Photos added |
DaveO90s4 |
Feb 3 2017, 11:48 PM
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#1
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
Hi all,
1975 model, now with the infamous flashing brake warning light. I had the oem master cylinder and front callipers overhauled when I bought the car about a year ago. Recently I could hear the flasher unit clicking as I drove, and now this has 'grown' to the red light flashing too. I have confirmed that the park brake switch is working properly. I can stop the flashing only by disconnecting the wire from the reconditioned master cylinder. There is no reset switch on that master cylinder. I am very confident that the brakes are working properly: good pedal feel, stops straight and well, no residual pressure holding any brakes on, etc etc. I have no reason to believe I need to bleed air out of the system or do any other work on the brakes - other than for this flashing light issue. I've done lots of searches, but other than for disconnecting the offending wire / switch ( which I'd much prefer not to do) I'm unsure what to do next. Maybe buy a new switch for the reconditioned master cylinder? All suggestions very welcome. Thanks Dave |
Krieger |
Feb 3 2017, 11:59 PM
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#2
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Advanced Member Group: Members Posts: 4,726 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
Hi Dave. Are you sure there is no switch on the master cylinder? It is on the unit that screws into the side of the master cylinder. The wire your talking about is plugged into it. The "switch" is just a small black rubber pin/nub that sticks out of the side of that unit. Just push it in with your finger 3-4 mm. You can get at it without jacking up the car. Just turn the steering wheel all the way right and get your body on the ground.
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DaveO90s4 |
Feb 4 2017, 01:39 AM
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#3
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
Hi Andy, well I'm pretty sure. I looked and looked and looked while I had the car up on the hoist. I'll go and have another look tomorrow and post a photo / findings.
Thanks Dave |
bdstone914 |
Feb 4 2017, 09:12 AM
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#4
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bdstone914 Group: Members Posts: 4,536 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
If there is no switch there must be something in the hole plugging it.
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Dave_Darling |
Feb 4 2017, 01:47 PM
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#5
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
See if you can get a decent pic of the switch.
--DD |
914Sixer |
Feb 4 2017, 03:37 PM
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#6
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914 Guru Group: Members Posts: 8,903 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Switches from 74-76 all have reset button. Make sure the rubber tip is on it. If it is missing a a small white dowel will be sticking out instead.
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DaveO90s4 |
Feb 4 2017, 09:35 PM
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#7
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
Hi all,
Photos attached. Can anyone see a reset switch anywhere? Attached thumbnail(s) |
DaveO90s4 |
Feb 4 2017, 09:36 PM
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#8
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
And one more photo
Attached thumbnail(s) |
914Sixer |
Feb 4 2017, 09:40 PM
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#9
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914 Guru Group: Members Posts: 8,903 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Interesting, the switch is a early style with one pole not two. Never seen one like that. I can post a picture tomorrow of a NOS switch with reset button.
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DaveO90s4 |
Feb 4 2017, 10:15 PM
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#10
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Member Group: Members Posts: 149 Joined: 26-April 16 From: Australia Member No.: 19,935 Region Association: None |
Thanks Mark, I'd appreciate that
I see this switch is sometimes referred at as the brake light switch. Maybe the two pole version does activate the brake lights. But not on my car - on my car the brake lights are activated by a contact switch inside the car under the wooden floor boards. That is working properly. Maybe I need a new single pole switch with reset button? Dave |
eyesright |
Feb 4 2017, 10:59 PM
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#11
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Member Group: Members Posts: 430 Joined: 8-January 12 From: OK Member No.: 13,979 Region Association: Southwest Region |
I tried and tried to fine the cause of my '76 flashing brake light...I hate to admit it but I finally just pulled the lead off the flashing bulb.
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boxsterfan |
Feb 5 2017, 12:22 AM
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#12
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
Had same flashing brake light on my 1974. Was never able to find the problem. I too never saw a reset button on the MC. Who's got a pic of one?
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ndfrigi |
Feb 5 2017, 03:20 AM
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#13
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Advanced Member Group: Members Posts: 2,933 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California |
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80cap |
Feb 5 2017, 10:03 AM
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#14
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Member Group: Members Posts: 317 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
This thread just solved a problem I was having! I couldn't find the source causing my flasher relay from clicking. It is the brake switch on the master cylinder. Now I have the same problem as in this thread. I pulled the wire and now more clicking but as mentioned my master cylinder doesn't have a switch.
Brian (IMG:style_emoticons/default/screwy.gif) |
80cap |
Feb 5 2017, 11:42 AM
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#15
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Member Group: Members Posts: 317 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
After disconnecting the brake warning wire from the master cylinder my interior light wont work on the door switches. The ground path to the switches opened. So now I have a continuous buzzer warning when the key is on telling me the brake warning light is supposed to be on but now the interior light works again. (IMG:style_emoticons/default/screwy.gif)
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Dave_Darling |
Feb 5 2017, 11:42 AM
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#16
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
The switch without a reset button is supposed to reset itself when the balance between the two circuits is restored. Could be that this one is sticking somehow?
--DD |
80cap |
Feb 5 2017, 11:50 AM
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#17
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Member Group: Members Posts: 317 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
When I get a good pedal I'll let you know. I am also have trouble bleeding these brakes. the system is all new from PMB.
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914-300Hemi |
Feb 24 2017, 06:22 PM
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#18
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Senior Member Group: Members Posts: 1,356 Joined: 7-September 06 From: San Dimas, CA Member No.: 6,794 Region Association: Southern California |
I just replaced my master cylinder from pmb iand now the brake light is flashing. I guess I will reset the wire from the MC and see if that fixes the issue.
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