In a first time, the Bay-Window Bus keeps the drum-brakes (see details per year). But soon, disks are installed (1970) and the piercing becomes 5/112. There are 5 cylinders for each front drum, and only one at the rear. The front drums are 250 mm long and 55 mm wide and at the rear 250 mm long and 45 mm wide. The hand-brake is still with cables, and the braking hydraulic circuit is double. The master-cylinder is much bigger than on the Split Bus (double circuit), with a valve on the spring maintaining constantly pressure in the circuit, which helps starting quicklier. The braking liquid tank is situated on the front panel.

All these infos provide from the issues number 128 and number 138 of Super VW Magazine .
These back issues are still available at the
supervwshop.