Mk III Rear Brake Photo Needed

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chaztuna

chaztuna

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I'm tearing down my Mk III project. I "think" the right foot rest and brake pedal are bent. There is discoloration in the middle of the right foot rest arm. Looks like someone tried heat to bend it back. It doesn't look right to me. Could someone direct me to a photo on this forum, showing the correct orientation? Viewed from top would be best. I suspect that somewhere in the My Bike or Bike Project threads, this photo might already exist.
I want to get it right, before I send it to the chrome shop!
 
Would also be interested in this as the screw on cap of my rear brake Master Cylinder is very close to the "Z" plate
 
Mk III Rear Brake Photo Needed

(A late Mk3 model with the 'straight' arm brake pedal)
 
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Richard Dodds said:
Would also be interested in this as the screw on cap of my rear brake Master Cylinder is very close to the "Z" plate
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Richard. I had the same issue. The master cylinder barrel threads into the body and is retained with a set screw. If the barrel is threaded to far into the body, the resevoir is located too close to the z plate and the cap rubs on the bolt. loosen the set screw and back the cylinder out a couple of turns and this will resolve the issue.
 
Steven Griffith said:
Richard. I had the same issue. The master cylinder barrel threads into the body and is retained with a set screw. If the barrel is threaded to far into the body, the resevoir is located too close to the z plate and the cap rubs on the bolt. loosen the set screw and back the cylinder out a couple of turns and this will resolve the issue.
Click to expand...
Hi Steven, thanks for your reply. The rear brake alloy housing is bolted to the foot rest arm with 3 bolts. The master cylinder resevoir is mounted onto the cylinder which is threaded into this housing. Surely backing the cylinder out will move tbe resevoir back even closer to the Z plate? I followed the instructions in the workshop manual to the letter, as it says the amount the cylinder screws into the housing is critical? I fitted a new s/s cylinder a few years ago.
Regards
Richard
 
Steven Griffith said:
The master cylinder barrel threads into the body and is retained with a set screw. If the barrel is threaded to far into the body, the resevoir is located too close to the z plate and the cap rubs on the bolt. loosen the set screw and back the cylinder out a couple of turns and this will resolve the issue.
Click to expand...

Screwing the master cylinder out would move the reservoir towards the Z-plate.


The number of turns the master cylinder screws into the casting needs to be set accurately and not randomly screwed either out or in.


If the master cylinder cap is closer to the Z plate than shown in my photo then the grub (set) screw can be loosened and the master cylinder rotated slightly to swing the cap away from the Z-plate.
 
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L.A.B. said:
Screwing the master cylinder out would move the reservoir towards the Z-plate.



The number of turns the master cylinder screws into the casting needs to be set accurately and not randomly screwed either out or in.


If the master cylinder cap is closer to the Z plate than shown in my photo then the grub (set) screw can be loosened and the master cylinder rotated slightly to swing the cap away from the Z-plate.
Click to expand...
I spent quite a bit of time setting up the cylinder /housing as the instructions said it was critical and I didn't want my brakes failing! From memory, doesn't the locking grub screw fit into a machined groove on the bottom of the cylinder? It's just after midnight here in NZ, so will have a look tomorrow and take a photo.
Many thanks for your imput
Regards
Richard
 
Sorry to ask what is an obvious question but the reservoir isn't fitted back to front by any chance athough I'm not sure that's possible?

Mk III Rear Brake Photo Needed
 
L.A.B. said:
Mk III Rear Brake Photo Needed

(A late Mk3 model with the 'straight' arm brake pedal)
Click to expand...
Les,
Thanks for the great photos. Did Norton change the design of the brake pedal during the Mk III manufacturing run? I ask, because the pedal on mine is rotated anti clock wise [as viewed from above], rather than perpendicular to the engine & transmission covers. The photo of the pedal on Andover Norton's site looks like mine.
My foot rest arm needs to have the section with the hole for the peg to be rotated slightly down and slightly clockwise, viewed from above.
 
L.A.B. said:
Sorry to ask what is an obvious question but the reservoir isn't fitted back to front by any chance although I'm not sure that's possible?

Mk III Rear Brake Photo Needed
Click to expand...
Yes, it is possible to install the reservoir "wrong way round". Are the SHCS [Socket Head Cap Screw, aka Allen] bolts in the photo, supposed to be chrome, zinc, or cadmium plated? I ask, because all my hardware is very rusty, no plating left.
 
chaztuna said:
Did Norton change the design of the brake pedal during the Mk III manufacturing run? I ask, because the pedal on mine is rotated anti clock wise [as viewed from above], rather than perpendicular to the engine & transmission covers. The photo of the pedal on Andover Norton's site looks like mine.
Click to expand...

Yes, the early pedal had a curved arm like this...
Mk III Rear Brake Photo Needed


..Later look straight when viewed side-on.
Mk III Rear Brake Photo Needed


Mk III Rear Brake Photo Needed


chaztuna said:
Are the SHCS [Socket Head Cap Screw, aka Allen] bolts in the photo, supposed to be chrome, zinc, or cadmium plated? I ask, because all my hardware is very rusty, no plating left.
Click to expand...

The ones on mine were a black (oxide?) finish but I don't know if they all were.

Edit: Pic in the Clymer Commando manual p.157 shows a bright finish. 2nd. edit: Other 'book' photos also show bright finish cap heads.
 
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chaztuna said:
Les,
Thanks for the great photos. Did Norton change the design of the brake pedal during the Mk III manufacturing run? I ask, because the pedal on mine is rotated anti clock wise [as viewed from above], rather than perpendicular to the engine & transmission covers. The photo of the pedal on Andover Norton's site looks like mine.
My foot rest arm needs to have the section with the hole for the peg to be rotated slightly down and slightly clockwise, viewed from above.
Click to expand...

L.A.B. said:
Yes.
Click to expand...
 
L.A.B. said:
Sorry to ask what is an obvious question but the reservoir isn't fitted back to front by any chance athough I'm not sure that's possible?

Mk III Rear Brake Photo Needed
Click to expand...
Hi LAB,
I'm a relatively new to this forum and not such how to post photos on here. I'm pretty sure I have my rear brake master cylinder set up correctly. I followed the workshop manual, also the instructions that came with the new s/s barrel (which is the same as you posted on here) I'm starting to think that perhaps my footrest arm is slightly twisted.
 
Richard Dodds said:
Hi Steven, thanks for your reply. The rear brake alloy housing is bolted to the foot rest arm with 3 bolts. The master cylinder resevoir is mounted onto the cylinder which is threaded into this housing. Surely backing the cylinder out will move tbe resevoir back even closer to the Z plate? I followed the instructions in the workshop manual to the letter, as it says the amount the cylinder screws into the housing is critical? I fitted a new s/s cylinder a few years ago.
Regards
Richard
Click to expand...
Richard, driving to get a coffee this morning, I realized my post was incorrect. Appologies, i did this work a about 18 months ago. So, you are correct, you must screw the cylinder further into the housing moving the resevoir toward the front of the bike and away from the Z plate. I did several test fits to insure I had the proper clearance and that the brakes returned to the neutral position when released. If you screw the cylinder in too far, the rod will not let the brakes release.
 
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