Rear disc brake master cylinder

The rear brake master cylinder fitted to cast spoke wheel Twins and Triples is easily removed and refitted. The one used on wire spoke wheel SFCs is a little different. Once removed, the overhaul of both units is similar. The conventional Twin and Triple unit is fixed to a special lug on the frame by

A theoretical. e* of the full set of hydraulic disc brakes

FRONT MASTER CYLINDER

REAR MASTER CYLINDER

hydraulic banjo on the lower fork leg showing the "z~r brake light switch uncovered

On some Triples the front banjo is mounted on a bracket and not directly onto the lower fork yoke. (The headlamp mounting rubber cushion is also visible)

FRONT MASTER CYLINDER

REAR MASTER CYLINDER

hydraulic banjo on the lower fork leg showing the "z~r brake light switch uncovered

A theoretical. e* of the full set of hydraulic disc brakes

On some Triples the front banjo is mounted on a bracket and not directly onto the lower fork yoke. (The headlamp mounting rubber cushion is also visible)

The arrow shows the pivot point, and the ms --freepiay measurement is also given for ; :: : ? hand lever. (The hydraulic clutch master :. -ioe should be adjusted in a similar manner

The standard eft hand side) rear disc brake pedal mechanism on the Triple two setscrews and bolts but before you undo these two to remove it, peel back the brake light switch rubber cover and disconnect the electrical connection. Then loosen the switch itself for it also acts as the banjo bolt for the flexible hydraulic pipe. This is awkward for there is not a lot of room in which to work. Then disconnect the bolt which locates the pedal plate to the pedal — the plate pivots through the body of the master cylinder. Just remove the bolt, leave the plate attached to the master cylinder body. Now release and remove the master cylinder body from the frame bracket. Release the flexible brake pipe and mop up any fluid before it hits paintwork. Seal off the end of the pipe. Lift the master cylinder body: remove the 'C' clips at its inner end and push the pin through. Remove the lever plate.

The SFC rear master cylinder uses only one bolt to locate it to the frame, and its difficult to work around, but otherwise the method is very similar. With the master cylinder away from the machine, dismantle the master cylinder using exactly the same precautions and methods as described for the front master cylinder. Use a new 'C' clip to retain the lever plate. Replacement of the master cylinder is an exact reversal of the removal sequence. Bleed the brake system. Rear disc brake pedal

Read the details for the rear drum brake pedal

The brake pedal used with a disc brake set-up does differ substantially from that used with a drum brake. The Twin pedal pivots itself on the frame like that of the drum brake model, using a

The arrow shows the pivot point, and the ms --freepiay measurement is also given for ; :: : ? hand lever. (The hydraulic clutch master :. -ioe should be adjusted in a similar manner

A better shot of the rear disc brake pedal adjuster screw just to the right of the foot rest

The standard eft hand side) rear disc brake pedal mechanism on the Triple

The rear disc caliper in place showing the pedal to master cyinder pivot plate and its socket head screw stop

return spring in a similar fashion and that locates itself through a special drilling to a lever arm via a washer and locknut. That lever then connects with the lever plate on the master cylinder through a short adjustable (for length) rod with a rose joint at each end. Look at the system and you will see how it works and how it can be dismantled. The factory set the length of the rod; it's unusual for tins to need altering. Once again, remember the return spring does have some power and that there is little room to move.

The Triple pedal system works slightly differently. The pedal itself is splined to a pivot pin [through the frame), that pivot pin is integral with the lever arm. The return spring coils itself around the pivot pin/lever arm. From there on the system is similar to that of the Twin and is dismantled in a similar way. The difference in the system does allow the Triple a number of angles for the brake pedal.

The SFC disc brake set-up uses a very similar system to that of the Triple although there is no return spring and the pedal (rear-set type) and lever arm are one piece, the centre of the lever/arm bushing on a lug on the frame.

The Twin pedal has a tiny adjuster in the lever plate; it needs adjusting and Locktiting in a similar fashion to that of some front handlebar levers. The Triple has an adjuster just like that of the drum brake models. Read that section.

The SFC system uses an eccentric fitted in the body of the master cylinder which operates on the lever plate. It has an obvious method of operation.

0 0

Post a comment