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A7/A10 cross over shaft rear brake query #443449
07/06/12 2:12 pm
07/06/12 2:12 pm
Joined: Oct 2005
Posts: 572
Surrey UK
M
Mattsta Offline OP
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Mattsta  Offline OP
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Joined: Oct 2005
Posts: 572
Surrey UK
I'm just wonderring if I have missed something here.

When the rear brake pedal return spring is fitted, the rear brake pedal springs upwards until it is stopped by the footrest carrier. However this angle is all wrong and leaves the foot pedal far too high for comfortable operation. It also rotates the cross-over shaft clockwise when viewed from the drive side of the machine and the cable pops out of the end of the brake operating arm fitted to the timing side of the crossover shaft.......DOH!

It looks like there should be some kind of stop fitted somewhere but I can't find any reference to one.

One for Beezageeza maybe???


1952 Triumph T100 in a BSA A7 Frame
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Re: A7/A10 cross over shaft rear brake query [Re: Mattsta] #443483
07/06/12 6:00 pm
07/06/12 6:00 pm
Joined: Feb 2012
Posts: 203
UK Tyne & Wear
P
photobob Offline
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photobob  Offline
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Joined: Feb 2012
Posts: 203
UK Tyne & Wear

This is a photo of my A10 rear brake setuphope it helps.

Re: A7/A10 cross over shaft rear brake query [Re: Mattsta] #443500
07/06/12 8:20 pm
07/06/12 8:20 pm
Joined: Apr 2002
Posts: 962
North East England
beezageezauk Offline
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beezageezauk  Offline
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Joined: Apr 2002
Posts: 962
North East England
Hi Mattsta,

I'm sure that the A7/A10's standard set-up doesn't have any form of stop fitted. However, I could maybe offer a couple of suggestions for you to check out or try.

First of all check the height of your footrests. The original ones are on a splined shaft and with the bike on the centre stand they should measure about 12 inches from the ground to the centre of the rubber. Using this as a gauge the brake pedal should automatically settle in a comfortable position.

The brake lever on the timing side of the crossover shaft is also on a spline that enables it to be adjusted (to a certain extent) to suit the free play length and adjuster on the cable. This normally points slightly towards the rear of the bike and should be in a vertical position when the brake is operated.

Now then, to complicate matters a bit, the rear brakes before 1960 had the brake operating lever working from the upper part of the brake drum and the 1960 onwards models from the lower part of the brake drum. Because of this difference there were two different brake cables. 42-7032 for the earlier models and 42-7042 for the later ones. These had a difference in the overerall length and free play and were not interchangeable. You need to determine if you have the correct one. The part numbers are so close that even though I've ordered cables by the part number I've actually been sent the wrong one.

Try setting your rear brake up using these perameters and see if you get an improvement.

Beezageezauk.

Re: A7/A10 cross over shaft rear brake query [Re: beezageezauk] #443568
07/07/12 7:55 am
07/07/12 7:55 am
Joined: Oct 2005
Posts: 572
Surrey UK
M
Mattsta Offline OP
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Mattsta  Offline OP
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Joined: Oct 2005
Posts: 572
Surrey UK
Originally Posted By: beezageezauk
Hi Mattsta,

I'm sure that the A7/A10's standard set-up doesn't have any form of stop fitted. However, I could maybe offer a couple of suggestions for you to check out or try.

First of all check the height of your footrests. The original ones are on a splined shaft and with the bike on the centre stand they should measure about 12 inches from the ground to the centre of the rubber. Using this as a gauge the brake pedal should automatically settle in a comfortable position.

The brake lever on the timing side of the crossover shaft is also on a spline that enables it to be adjusted (to a certain extent) to suit the free play length and adjuster on the cable. This normally points slightly towards the rear of the bike and should be in a vertical position when the brake is operated.

Now then, to complicate matters a bit, the rear brakes before 1960 had the brake operating lever working from the upper part of the brake drum and the 1960 onwards models from the lower part of the brake drum. Because of this difference there were two different brake cables. 42-7032 for the earlier models and 42-7042 for the later ones. These had a difference in the overerall length and free play and were not interchangeable. You need to determine if you have the correct one. The part numbers are so close that even though I've ordered cables by the part number I've actually been sent the wrong one.

Try setting your rear brake up using these perameters and see if you get an improvement.

Beezageezauk.


Hi BG

Thanks for that. I'm having the rear brake return spring modified. You might remember that I posted a thread querying the shape of my rear brake pedal. I think it has been heated up and bent into a different shape at some point in the bike's history. I think this might be the root of the problem

Some time ago, you posted a photo of the way the rear brake spring is fitted but I can't find it on the forum. I'd really appreciate it if you can find it and repost it

Cheers

Matt


1952 Triumph T100 in a BSA A7 Frame
Re: A7/A10 cross over shaft rear brake query [Re: Mattsta] #443570
07/07/12 8:43 am
07/07/12 8:43 am
Joined: Apr 2002
Posts: 962
North East England
beezageezauk Offline
BritBike Forum member
beezageezauk  Offline
BritBike Forum member
Joined: Apr 2002
Posts: 962
North East England


Happy to oblige.

Beezageezauk.

Re: A7/A10 cross over shaft rear brake query [Re: beezageezauk] #443575
07/07/12 10:32 am
07/07/12 10:32 am
Joined: Oct 2005
Posts: 572
Surrey UK
M
Mattsta Offline OP
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Mattsta  Offline OP
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Joined: Oct 2005
Posts: 572
Surrey UK
Thanks BG! pint


1952 Triumph T100 in a BSA A7 Frame

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