BRAKE PIPE RUN
The pressure port of the master cylinder is connected by a metal pipe, which runs across the rear bulkhead, to the Inlet port of the servo unit mounted in the rear right hand corner of the engine compartment and the outlet port of the servo unit is connected by a second metal pipe to the top forward connection of the five way connector mounted on the right hand front wheel arch.
The centre connection of the five way connector accom-modates the stop light switch while the bottom forward and bottom rearward connections are connected by metal pipes and flexible hoses to the left and right hand front brake calipers respectively. The junctions of the metal pipes and flexible hoses, In addition to the metal pipe to the left hand front brake caliper are supported in brackets and clips welded to the rear face of the front suspension crossmember.
The top rearward connection of the five way connector is connected by a metal pipe, which passes through the wheel arch and runs rearward under the floor of the car to a flexible hose mounted in a bracket welded to the car floor.
The second end of the flexible hose is fitted in a bracket welded on the rear axle casing which is connected by a short metal pipe to the lower tapping of the right hand wheel cylinder. The upper tapping of this wheel cylinder is connected by a metal pipe which runs the length of the rear axle casing to the lower tapping of the left hand wheel cylinder, the upper tapping accom-modates the bleed screw.
The metal pipes in the engine compartment, on the front suspension cross beam, under the floor and on the rear axle casing are attached by rubber sleeves and clips to absorb vibration which could result In possible fracture. To provide the vacuum for servo assistance, the servo unit is connected to the engine inlet manifold by a flexible hose and a non-return valve, the latter being situated in the banjo connection on top of the servo unit.
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Bending mental pipes
The diameter of the metal pipes is as follows
Pressure: From master cylinder to brake servo unit and from brake servo unit to calipers and wheel cylinders—3/16 in. diameter with 7/16 in. 20 T.P.I. UNF. union nuts.
Should the metal pipes be supplied in straight lengths, they must be shaped to follow the form of the original. In the event of the original being damaged beyond useful-ness, a pattern must be made up from a length of heavy gauge maleable wire and then using this as a master.
The new straight pipe can easily be shaped with the fingers or on a pipe shaping "dolly" but in the absence of the latter, a piece of pipe similar in radius to the shape required can be used. To assist in forming the shape adjacent to the ends of the new pipe length, a three- or four-way connector can be screwed onto the union nut to provide a better grip.
Union nuts
The union nuts must never be overtightened since their threads may become stripped. Use only short spanners of 4 to 5 in. (10.0 to 12-5 cm) in length.
The torque loading is: —
Male 7 to 8 lb. ft. (0.9 to 1.1 kg. m.)
Female 8 to 10 lb. ft. (1.1 to 1.3 kg. m.)
FLEXIBLE HOSES
To accommodate the constantly changing position of the front wheels and the rear axle whilst the car is moving, flexible hoses are used to connect the pressure pipes to the front wheel calipers and the metal pipes mounted on the rear axle casing.
The flexible hoses must be examined at regular intervals for chafing, general deterioration and leakage. When there is any doubt concerning the condition of the flexible hose it must be renewed. Should a flexible hose become blocked, it must never be cleared by probing but renewed
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