L555 PARK BRAKE Assembly

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AndyDWA

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Dec 3, 2021
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I know similar questions have gone unanswered but I thought I’d try asking.

The parking brake (L555 Deluxe, sprocket type) had lost a bushing/bolt. I put it back in but now the pedal won’t stay engaged. I’m convinced the spring is incorrectly located but have no idea where it should go. Messicks diagram shows two springs but I only have the long one (23). Can’t see where #16 spring would attach. Diagram shows #23 attaching to top of rod, but this seems unlikely. It is currently attached to a split pin inserted through the main bracket.

Anyway, I’m hoping someone could share some shoots of a functioning assembly.

IMG_6388.jpeg
IMG_0690.jpeg
 
I’m putting this here for future reference.

I found an image online and “photoshopped” it for clarity. I am missing Spring #16. It appears that it attaches to one small hole in the main pedal and one in the Floor Bracket (not showed in Messicks diagram). In my case, the bracket hole was filled so I never realised it was there. It is in the pointed corner that bends out from the bracket.

I made a spring to use here but it is too strong and immediately disengages the pedal.

Spring #23 attaches to a Cotter Pin #24 through the Bracket #24 - not to the top of Rod #15 as shown in the diagram. Such attachment appears impossible and pointless.

Oddly, Spring #23 also seems to act as a return spring if it has any useful tension on it. I suspect it is supposed to act like an “over-centre” mechanism, locking Handle #20 in place when the brake is engaged (though I can’t see how). Kicking the handle back up should, I assume, nudge the main pedal #18 allowing Spring #16 to disengage the brake. However, in my case, Spring #23 - if it does anything at all - pulls the handle back, immediately disengaging the brake.

Alternatively, Spring #23 is just to stop Handle #20 flopping about. Maybe Spring #16 should act as an over-centre mechanism but, again, I can’t see how. It just feels like the over-centre principle should apply.

If anyone can shed more light on this, it would be appreciated.
IMG_6396.jpeg
 
UPDATE:

After much trial and error - and finding a reliable illustration, I've made progress, albeit with a modification from original.

For anyone trying to solve parking brake issues, the main spring goes on the outside of the bracket. Mine was installed inside the assembly, causing problems where it interfered with other components. Lots of photos online show the same installation. It's wrong.

To operate properly, the smaller pedal needs to be pushed down such that the spring (#23 in Messicks diagrams) pulls downward on it. To achieve this, I connected an eyelet to the bottom bracket bolt. I don't know where the original mount point was supposed to be. I recommend using a split pin in the hole on the pedal shaft. This gives me the over-centre action I was looking for.

To work things out, I created a rough diagram so I could rotate various parts to see how things might line up. It's not to scale but it "feels" about right.

This only solves the problem of the brake releasing without warning. I doubt it will affect the problem of the locking bar barely engaging in the sprockets.
IMG_6466.jpeg
 

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