Harrison brake bias - solved!

[gjkrv8]

Paul, you might be right. I'd like to get some nice 4 spots for the front one day.

I think I will wind the bias a bit further towards the front and test up at the Nationals to see if I can get the fronts to work harder.

cheers Gregg

[Philm]

Gregg,
Have you tried swapping mastercylinders?

Phil

[gjkrv8]

Originally Posted by Philm

Gregg,
Have you tried swapping mastercylinders?

Phil

They are the same size. Was it the size you were thinking or the Cylinder might be faulty??

[Aussie Mike]

Originally Posted by gjkrv8

They are the same size. Was it the size you were thinking or the Cylinder might be faulty??

Our older cars ran 3/4" front and 5/8" rear master cylinders. This can vary depending on what size calipers you have.

The theory is to work out the ratio of piston area between the master cylinder piston and the caliper pistons. The rear calipers are single piston and the front are twin or 4 piston so have more surface area. Oposed pistons calculate as a single piston in area so for a 4 piston calipers you take the total piston area and halve it they are opposed pistons.

When you know those ratios you can then work out the difference in ratios brtween front and rear and adjust the size of the cylinder to get you in the ball park of where they should be for the weight of the vehicle etc.

The balance bar is really just for fine tuning the front rear balance.

Cheers

[Philm]

As mike has said, i thought you had 2 different size master cylinders.

That is the good thing about the cr system, you can tune the brakes for a perfect bias.

Phil