Author Topic: Brake pedal fouling collector box  (Read 304 times)

Offline DaveN

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Brake pedal fouling collector box
« on: March 24, 2020, 04:29:35 PM »
Well, here's one I didn't expect.

Prior to a 250 mile nuts'n'bolts check, I had slackened off the rear brake operating lever as, when the good lady wife was aboard, the rear was binding (I presume from the extra weight compressing the shocks etc). All was fine, put a few more gentle miles on the rebuilt engine and back to my man it went for said torque-checking.

Collected it today (before we come under martial-law and start shooting curfew-breakers) and gave it a few harder miles (which required harder braking) and found that the rear brake pedal had a distinct detent in its travel with a correspondingly exciting extension of stopping distance. Safely home and a closer inspection reveals that the pedal toe guard is catching the collector box and then pushing past it to apply full braking (see photo)

Now, I did not assemble the machine, so my question to all you stars who have is:
If I slacken all the exhaust assembly bolts, will there be enough movement/adjustment available to move the collector box a few mill in-board or do I need to apply brute-force and crank the brake lever out some? I do recall hearing that these systems are a bit fiddly to get lined up.

And yes, I know I have been cheap and powder-coated the levers rather than re-chroming them, but I want use it, not peruse it and I feel it was a contemporary cosmetic solution.
1977 Honda CB400F Super Sport
2016 Herald Classic 250
*1979 Honda CB550K*
*1980 Honda C90*
*1973 Suzuki GT185*
*1968 BSA Bantam Bushman*
*1964 NSU Quickly*

Offline Bryanj

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Re: Brake pedal fouling collector box
« Reply #1 on: March 24, 2020, 04:50:36 PM »
I suspect the pedal has been bent in the past

Offline taysidedragon

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Re: Brake pedal fouling collector box
« Reply #2 on: March 25, 2020, 12:47:13 PM »
It does look bent in slightly. I had the same problem and couldn't bend the pedal out enough despite lots of heat and brute force in the vice. Ended up buying a pattern pedal. There is very little clearance as standard, but check the pedal height adjustment is right, then adjust the brake rod at the brake drum. That might help.
Gareth

2010 Street TripleR
1977 CB400F

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: Brake pedal fouling collector box
« Reply #3 on: March 25, 2020, 01:27:28 PM »
If it helps, this is my standard non bent brake pedal with original headers/collector box.
Pic 1 shows the pedal in its resting position with plenty of clearance.
Pic 2 . The clearance when pedal fully depressed.

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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: Brake pedal fouling collector box
« Reply #4 on: March 25, 2020, 01:29:37 PM »
And a full side on photo with the lever in its resting position

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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline DaveN

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Re: Brake pedal fouling collector box
« Reply #5 on: March 25, 2020, 02:40:06 PM »
Thanks All.
Compared to NJ's original, mine looks to be set too low. I'll re-set the pedal/linkage and see if that gives me the clearance.

Thanks Nurse Julie, if you are active in the current Corvid 19 scenario, thank you and keep safe :-)
1977 Honda CB400F Super Sport
2016 Herald Classic 250
*1979 Honda CB550K*
*1980 Honda C90*
*1973 Suzuki GT185*
*1968 BSA Bantam Bushman*
*1964 NSU Quickly*

Offline DaveN

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Re: Brake pedal fouling collector box
« Reply #6 on: March 25, 2020, 04:50:26 PM »
SORTED!

It seems we simply missed the pedal/shaft alignment dots :o
Re-assembled as per the set-up instructions and it all works as it should.

Once again, many thanks to all who helped with suggestions and piccys  :)
1977 Honda CB400F Super Sport
2016 Herald Classic 250
*1979 Honda CB550K*
*1980 Honda C90*
*1973 Suzuki GT185*
*1968 BSA Bantam Bushman*
*1964 NSU Quickly*

Offline DaveN

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Re: Brake pedal fouling collector box
« Reply #7 on: March 25, 2020, 04:58:14 PM »
As an aside, does anybody know what the big loop on the foot-rest mount is there for?
It's clear on Nurse Julie's photo.
1977 Honda CB400F Super Sport
2016 Herald Classic 250
*1979 Honda CB550K*
*1980 Honda C90*
*1973 Suzuki GT185*
*1968 BSA Bantam Bushman*
*1964 NSU Quickly*

Offline Bryanj

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Re: Brake pedal fouling collector box
« Reply #8 on: March 25, 2020, 05:09:32 PM »
Its the roadkill mounting point

Offline Athame57

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Re: Brake pedal fouling collector box
« Reply #9 on: March 26, 2020, 12:41:32 AM »
Its the roadkill mounting point
How heavy a person can you mount on it?
I brake for animals!
1978 CB400F2

Offline Oddjob

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Re: Brake pedal fouling collector box
« Reply #10 on: March 26, 2020, 01:47:54 AM »
Knowing the Japanese it's most likely there to stop any chance of your foot contacting the collector box.
Don't play stupid with me, I'm better at it

Offline K2-K6

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Re: Brake pedal fouling collector box
« Reply #11 on: March 26, 2020, 08:52:55 AM »
As an aside, does anybody know what the big loop on the foot-rest mount is there for?
It's clear on Nurse Julie's photo.

Speculative,  but I think they are to prevent the brake lever being pushed into the clutch cover if you drop the bike on that side.

In common with most Japanese brake levers of that era,  they leave a very defined tang on the engine side of the foot plate that was often "punched" through the casing even if the bike simply fell over while stationary.

 

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