Ahead gradually

Though window screen was not iced so much the temperature outside was below zero degree Celsius, coldest day this winter.

Exerted myself on VW 1302 Super Beetle servicing from morning till dark at night with desperate efforts, restoring on brake system was almost established 99%, residual 1% is brake fluid filling and bubble emissions in lines.

Fallen rubber tubes connecting between brake master cylinder and fluid reserver tank, relatively long way, were replaced thoroughly with silicon tubes, witout body lifting up difficult and time consuming tasks on earth. Also brake shoes fitting in brake drums were ascertained again with best cares including hand brake system.

Broadening size of wheel invites unpredictable ploblem, the outer part of wheel inner surface touches on suspension coil spring lower support on strut construction a bit, grinding about 1mm solved this problem.

In the situation of negative camber application on frontal axle, the same kind of problem may occur again, the way to go would be wheel spacer insertions with 8mm thickness.

Slowly and gradually the step of restoring VW Beetle goes forward.

About the renewal tires on BC7 SUBARU Legacy LSi US model, Bridgestone Potenza RE 01:

All the pressure on 4 wheels were set at 2,4 kg/cm3, one week later checking proved 3 wheels showed 2,2 kg/cm3 except left frontal one at 2,3 kg/cm3. After adjusting at 2,4 kg/cm3 on both frontal wheel, left side tendency disappeared.

So even 0,1 kg/cm3 difference caused strange steering reaction.

The reason of this physical phenomena is the lateral displacement of ground touching areas of frontal tires, this can be regarded as same as lateral offset of frontal axle, in another way, the checking is easily performed by this intentional method, setting different tire pressures promptly.

I just remembered a consideration about the self-energizing effect on the leading and trailing drum brake system. Brake shoe supporting point on the adjuster has some tolerance radially about 15mm, so the touching point fluctuate according to the factor caused by grinding for setting adjustments. It's easily imagined that the difference of Radial distance invites that of the lateral vector leading to lack of balance on self-energizing effct when activated. Then what'll happen in the circumstance with diffrent brake power, yes dangerous wondering when the stopping power exerted by the driver unintentionally.

Changing standing point of view, the touching and pivot position on adjuster's radial diameter 15mm may affect the taste of braking phase, because the interval from the begining of braking stage to the tire slipping phase is the true braking phase.