[Mr Mit]

Okay
Im running a trump front drum and im having issues , i keep bending the brake stay the ive welded to the rear leg .
Im not really sure what im doing wrong , Should i have the stay higher up the leg ? or should i move the privot from the drum back so i have a longer pivet arm that way ?
Im also running new springs inner's and out's
hope that sorta makes sence , ive whacked on some pics

Cheers All

 

[Neo Dutch]

1. The stay should form a 90 degree angle with the place it bolts to the plate and the axle for peek performance.

2. Weld a flange onto the back of the rear leg. That's how HD did it. Someone probably repops them so get one and braze it on.

Here's a pic stolen from Kickstart Cycle Supply.

 

[Zeeman]

Brake stay should be parallel with the rocker to move up and down easily, and not create undue push/pull forces on rear mount. + 1 on welding mount to the rear springer leg, lower than current position.

 

[Zeeman]

 

[Scott McKelvey]

• first and foremost, the rear mount looks way to flimsy, plus the heim is mounted so far out on it, there's a ton of moment or leverage. is that a 5/16" bolt butt welded to the rear leg? as others pointed out, i'd mimic a stock one as close as possible.
• second, the brake backing plate needs to free of the hub/axle, etc. It should be floating, which I can't tell in your pic. If it isn't you need to come up with a new design.
• lastly, as was pointed out the anchor arm should be parallel to the rocker (holes for the axle and rear leg). but it looks like you are close enough already that I doubt that's causing any issue.

 

[Mr Mit]

Thanks guys ,,, All sorted now
I think im just used to building pommie bikes and didnt go heavey duty enough.

Way better now !

 

[gsand]

there is now way i would have used the brake with that original mount. did you ever do any emergency stops? that shit would shear right off.

 

[Mr Mit]

Yeah thats why its bent dude.

She's good to go for an endo now !

 

[greasystain]

i would have drilled through the leg completely and welded in a threaded bung and then used a bolt with a shoulder.

 

[Mr Mit]

I'll post a pic tomorrow and show you what i came up with !

 

[Mr Mit]

I ended up welding a thick lug on the back leg then turned up and tapped a bung so a high tensile bolt can screw through , then welded the bung to the lug , Works way better

Cheers