Problem: The front brake locked up as soon as the brake was used.

The plot thickens. It was noted that if the bleed screw to the front caliber were unscrewed, the brake caliber would relax. The brake would then release the brake disk. The pressure if not release manually would gradually disperse after a few minutes. This is a clue that if interpreted correctly would solve this mystery.

The front master cylinder was first rebuilt. This was in dyer need. The caliper was rusted and corroded. A new stainless steal was use to update the master cylinder and contain the future corrosion. It adds a long lasting cosmetic improvement as well as improving the longevity of the hydraulic pump. Alas, the front brake still locked up with the same symptoms.

It is interesting to note that Brake fluid DOT 4 was selected to replace the original DOT 3. The major reason for this replacement it's the improved properties of this brake fluid. DOT 4 is compatible with other fluids. DOT 5 fluid is not compatible with DOT 3. Repairs on the road may require the use of DOT 3, DOT 4 or DOT 5 fluids. The use of DOT 4 allows the repairer this latitude.

Geography may have something to do with your decision. Florida has 90% humidity most of the year. Some of this water is bound to work its way into your fluid. Another essential reason to use DOT 4 is its capability to absorb water. DOT 5 is not capable of this.

How often do you change your brake fluid? Do you remember when you changed your brake fluid last? If you cannot answer these questions, be safe and use DOT 4.

The front caliber was the next suspect. The caliber was cleaned and rebuilt. Nothing was observed in this exercise. The brake pads were also replaced. This was the last part of the brake system that was replaceable. This looked promising at first, but did someone say British brakes don't work!

Something that bothered Joe was the pressure built up in the caliber. The metal connecting hose was removed from the caliber. The brake was applied. It was noted that excessive hand griping was required to pull in the lever. The metal connecting hose was removed from the brake system and checked. This appeared clear. Working his way up the line, the rubber hydraulic hose was removed. Visual inspection did not reveal anything. The brake was applied. The brake lever was easily pulled in. Bingo!! This hose was acting as a one-way valve. Not letting the fluid return up to the master cylinder and causing the pressure built up in the caliber. Mystery solved! The renewed brake system was assembled and the 1976 Bonnie was on the road! Long Live the Limey.