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> How do you reset the master cylinder brake switch, The 2 wire type
913B
post Sep 5 2016, 08:30 PM
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The brake switch on my master cylinder has 2 wires. I didn't see any reset button. When I unplug the brown/white signal wire going to the brake light in the gauge. The brake light will respond accordingly to the hand brake and go out. Before it would stay lit all the time regardless if the handbrake was applied or released.

So the question is how do you reset the brake switch or do I need to bleed the brakes ??

The brake light was working fine until the transport company moved my vehicle. I think the driver may have applied the brakes too hard maybe (IMG:style_emoticons/default/confused24.gif)

Let me know you thoughts.

Thanks everyone ! (IMG:style_emoticons/default/driving.gif)
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North Coast Jim
post Sep 6 2016, 12:02 PM
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QUOTE(porsche913b_sp @ Sep 5 2016, 10:30 PM) *

The brake switch on my master cylinder has 2 wires. I didn't see any reset button. When I unplug the brown/white signal wire going to the brake light in the gauge. The brake light will respond accordingly to the hand brake and go out. Before it would stay lit all the time regardless if the handbrake was applied or released.

So the question is how do you reset the brake switch or do I need to bleed the brakes ??

The brake light was working fine until the transport company moved my vehicle. I think the driver may have applied the brakes too hard maybe (IMG:style_emoticons/default/confused24.gif)

Let me know you thoughts.

Thanks everyone ! (IMG:style_emoticons/default/driving.gif)


Just reworked my entire brake system with help from PMB Performance. Replaced the master cylinder as well. I too had the persistent "brake" light flashing/alarm and didn't know how to remedy the situation. Was told by Eric at PMB that I needed to reset the switch. Since I had the car up on stands I could easily get to the master cylinder again. Removed the boot protecting the two electrical wires. Adjacent to the two electrical posts is the switch, not really a switch since all you have to do is push it in. It is only a protrudence of plastic and not easily recognized as a switch. Push on it while the key is turned to the on position. You will hear the cessation of the brake alarm. The brake light will stop blinking. Easy. I've had to do this twice now once with the car on the ground.
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porsche913b_sp   How do you reset the master cylinder brake switch   Sep 5 2016, 08:30 PM
Krieger   The reset is on the left side of the master cylind...   Sep 5 2016, 09:36 PM
porsche913b_sp   The reset is on the left side of the master cylin...   Sep 5 2016, 10:03 PM
porsche913b_sp   The reset is on the left side of the master cylin...   Sep 5 2016, 10:06 PM
Krieger   Post a pic of your master cylinder   Sep 6 2016, 09:33 AM
North Coast Jim   The brake switch on my master cylinder has 2 wire...   Sep 6 2016, 12:02 PM
Kansas 914   It is the black "shaft" in this picture....   Sep 6 2016, 12:12 PM
porsche913b_sp   I wish I had a pic of my switch the center part is...   Sep 6 2016, 01:07 PM
porsche913b_sp   So I have come to the conclusion there is no reset...   Sep 8 2016, 09:36 PM
Garland   I have the same concern, have left the one wire lo...   Sep 8 2016, 10:20 PM
Garland   I have the same concern, have left the one wire l...   Sep 8 2016, 11:36 PM
porsche913b_sp   you want to switch to 2 pole ?? You mean to replac...   Sep 8 2016, 10:41 PM
Dave_Darling   I have a two-pole switch with a reset button... M...   Sep 9 2016, 09:55 AM
NoEcm   I just installed a new single pole switch because ...   Sep 9 2016, 10:35 PM
porsche913b_sp   Thanks everyone for the contributions. I want to s...   Sep 11 2016, 04:50 PM
Kemo   im bringing up this old thread because im having a...   Jun 13 2026, 01:02 PM
emerygt350   im bringing up this old thread because im having ...   Jun 13 2026, 01:15 PM
emerygt350   And to answer the 10 year old question... Here yo...   Jun 13 2026, 01:19 PM
Kemo   thanks for the response...my car has the same 2 po...   Jun 13 2026, 05:24 PM
DeanBob   So I am piling onto this long-in-tooth post with a...   Aug 7 2026, 11:16 PM


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