Manual Brake System Trouble Shooting: Expected Line Pressure?

[FETorino]

Originally Posted by Ron Sutton

In my experience, for 3500# cars, here's a GUIDELINE that is based on total braking force including the front & rear brake systems.

GUIDELINE:
2500# = Average passenger car
3000# = Performance production car
3500# = Good street & track braking system
4000# = Track braking system with good tires
4500-5500# = Full race brake systems

The very bottom line of the chart shows total braking force with that combination if you were looking for 70% front braking, as I often do in race cars.

If anyone is putting together a system & has questions on one part or another, I'll be happy to calculate things and/or advise you. I have spread sheets to work out front & rear systems & compare options. I can also change inputs in this chart to show you how they all look with a different brake pad, pedal ratio, master cylinder, etc.

Ron

I have a dumb question.

The figure at the bottom is total braking force of the front brakes when they are doing 70% of the work or is it an estimation of the total including the 30% contributed from the rear brakes?

I have W6A front calipers with a 7/8" master cylinder and I have a 6 to 1 pedal ratio. So I read 3141 lbs of force with this set up. Is that 3141 for the front and 4487 total or 3141 total?