Upward pointing Brake Arm vs downward pointing

Anything about Ariels
User avatar
pauldridge
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 122
Joined: Mon Jun 27, 2016 11:42 pm
Location: Austin, TX
Contact:

Upward pointing Brake Arm vs downward pointing

Postby pauldridge » Fri Mar 15, 2019 1:55 am

There has been some discussion on the forum regarding issues with the downward pointing rear brake actuating arms of the early 50's vs. the change to upward arms on the later bikes, to eliminate the issue of possible servo-actuation of the brakes under certain hard braking conditions.

My '53 Square 4 has the downward pointing arm, and I'd like to change it over if the issues aren't insurmountable. One MAJOR advantage is that access to the brake cable adjusting fixture would be so much easier, not to mention the safety aspect.

Last night I searched through some 200+ forum posts on "brakes", but couldn't dig up any discussion regarding the actual steps (and parts) necessary to make this change.

Can anyone point me to a relevant discussion (and, yes, I have read the notes regarding this on the Draganfly brakes page)
Phil Auldridge Austin, Texas - USA
Visit the North America Ariel forum: http://arielnorthamerica.org/phpBB3/
53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage

User avatar
keith.mettam
Holder of a Waxed Cotton Anorak
Holder of a Waxed Cotton Anorak
Posts: 441
Joined: Wed Mar 02, 2011 1:46 pm
Location: Kent UK
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby keith.mettam » Fri Mar 15, 2019 6:24 pm

Type the word 'servo' in the search engine Paul. The threads revealed will help you.
Regards,
Keith.

User avatar
marcus whatling
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 225
Joined: Wed Dec 28, 2011 10:17 pm
Location: Margate
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby marcus whatling » Fri Mar 15, 2019 6:28 pm

Safer with arm up. Have used both types .If using under arm with cable have plenty of slack in the cable .

davi.haysom
Posts: 34
Joined: Wed Jul 06, 2011 4:06 pm
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby davi.haysom » Fri Mar 15, 2019 6:36 pm

Hi, change it to up pointing. no problem, then make it rod operating. drags have the reverse spring for the arm. have done this to all my square fours as the cable version locked up quite easily and nearly had me off several times. best of luck.

User avatar
pauldridge
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 122
Joined: Mon Jun 27, 2016 11:42 pm
Location: Austin, TX
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby pauldridge » Fri Mar 15, 2019 6:38 pm

Thanks Davi,
If you have pictures of your installation, it would be very helpful
Phil
Phil Auldridge Austin, Texas - USA
Visit the North America Ariel forum: http://arielnorthamerica.org/phpBB3/
53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage

User avatar
simon.holyfield
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3934
Joined: Mon Oct 17, 2011 11:16 pm
Location: Norfolk
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby simon.holyfield » Sat Mar 16, 2019 8:41 pm

Watch out for your lower chainguard and brake light switch. Later bikes have the switch mounted on the chainguard, and trying to have a brake rod occupy the same space is a bit tricky.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
http://ariel-square-four.blogspot.com

User avatar
pauldridge
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 122
Joined: Mon Jun 27, 2016 11:42 pm
Location: Austin, TX
Contact:

Re: Upward pointing Brake Arm vs downward pointing

Postby pauldridge » Sat Mar 16, 2019 10:10 pm

Thanks Simes
I am going to stick with the cable, it just isn't making sense to make a bunch of modifications for a system that may not be as positive as the cable
Phik
Phil Auldridge Austin, Texas - USA
Visit the North America Ariel forum: http://arielnorthamerica.org/phpBB3/
53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage


Return to “Ariel Talk”

Who is online

Users browsing this forum: No registered users and 18 guests

cron