Brake Light Switch

[John Straub]

Is there an adjustment on a '65 911 brake light switch to make it come on sooner?

Thanks,
John

[John912]

I don’t think so John, it works by sensing brake fluid pressure

[HarryD]

Is there an adjustment on a '65 911 brake light switch to make it come on sooner?

Thanks,
John

There is a micro switch activated by the brake pedal which turns the brake lights on. There is no brake operating switch in the MC. The Switch is part #72 in this drawing.

Also attached is the page from the Factory Manual telling you how to adjust.

[jim amato]

65 cars have a pressure switch in the line

[HarryD]

65 cars have a pressure switch in the line

I stand corrected. Looks like this is true to 67 for the single circuit cars.

[Chris Pomares]

I converted to the #22 above, a duel master, LED bulbs, and the pedal switch on my 67. Getting the switch adjusted took a little time. It works very well.
I also added a 3rd and 4th brake light. The long hoods have small and low lights. Jacked pickups and off road SUV's can hardly see them if they're tailgaters.
I also added day time running lights. Better safe then sorry.

[John912]

Is there an adjustment on a '65 911 brake light switch to make it come on sooner?

Thanks,
John

John, make sure there's no air in the system. Chances are it's a bad switch. They're easy to change and inexpensive. I've had at least one go bad over the years.

[mathieulecomte]

Answer is no.
The switch is a pressure switch on the Master Cylinder.
Dual MC only arrived in 68 and the switch left the MC to migrate to the pedal cluster and become a mechanical switch showed by Harry D.
Many people switch to the 68+ dual MC setup for redundancy and safety.

[John Straub]

Thanks guys, I'll pull the floorboard off and take a look. The car is a '65 with a single MC and the brake only comes on when I push the pedal all the way down.

John

[John912]

Thanks guys, I'll pull the floorboard off and take a look. The car is a '65 with a single MC and the brake only comes on when I push the pedal all the way down.

John

John, on a 65 you don't pull the floorboard to gain access. Jack up front of car, or use a lift if you have one, to remove the protective belly plate to gain access to the master cylinder. The switch with two wires attached is easily accessible with plate removed. Remove wires and unscrew to remove the switch. Bleed brakes afterwards. Position of wires doesn't matter as long as both are connected to spade terminals on switch. If I remember correctly, there's also a rubber protective boot.