Adjust brake pedal height?

[GaryR]

My 78 SC race car brake pedal returns to a position about 1" further toward me than my clutch, which to me is in the proper orientation. In my street 78 SC the brake and clutch are very close to equal at rest, which is what I want.. Is there an adjustment for brake pedal height?

[javadog]

You can adjust the brake pedal position, by loosening the jam nuts on the rod that connects the brake pedal with the linkage in the booster and twisting the rod. Whether Porsche intended that to be the case, I cannot say. I'd be careful how much you adjust it, to make sure you have enough travel in case of a failure in one brake circuit. I'd also be thinking about the pedal ratio; it changes slightly as the pedal moves through its arc.

Usually, if the clutch and brake pedals aren't even, it's the clutch pedal not coming back all the way that is the problem. Pull it backwards and see what it does.

JR

[GaryR]

Thanks JR. Wish I took a picture but the clutch is up fairly straight but the brake is actually at an angle towards me. I think it's worth a look behind the floorboard either way... i'm used to it but it makes left foot braking a lot more difficult.

[aston@ultrasw.c]

Normally one lowers the brake pedal to help with heel and toe.

Once adjusted make sure that when you are hard on the brakes there is still a gap between the underside of your foot and the throttle. That is, if your foot didn't land squarely on the brake pedal and overlapped with the throttle a small amount.

BTW why are you left foot braking?

[GaryR]

Originally Posted by aston@ultrasw.c

Normally one lowers the brake pedal to help with heel and toe.

Once adjusted make sure that when you are hard on the brakes there is still a gap between the underside of your foot and the throttle. That is, if your foot didn't land squarely on the brake pedal and overlapped with the throttle a small amount.

BTW why are you left foot braking?

It's a technique that allows you to stay on the throttle and brake at the same time in a high(er) speed corner, keeps the car balanced better than the traditional method of removing your foot from the throttle and applying brake... just IMO of course.

[Quicksilver]

Specifically: Left foot braking, while remaining on the throttle, will allow you to settle the front end a touch and point into a corner without upsetting the cars balance or loosening the car.

In more conventional situations, left foot braking allows you to go from throttle to brake without any pause between the two. In truely serious cars (formula...) it makes a measurable difference in laptime that will show in telemetry. It is something that a very serious racer is expected to have in their portfolio.

When running more conventional cars where you have a slower and more prenounced weight shift from front to rear it isn't as important. I'm not good at it so I rarely do it but I know I'm leaving a few hundreths on the table.
The weird thing is: Why does it feel so natural when running karts? I can threshhold brake a kart without thinking but in a car it just isn't natural.

[chrisbruck]

Originally Posted by aston@ultrasw.c

BTW why are you left foot braking?

Must be practicing his off road rally car skills.....

[GaryR]

Originally Posted by chrisbruck

Must be practicing his off road rally car skills.....

Yes, that's it....