Front calliper Replacement Bonnie 2003 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 18 (permalink) Old 03-04-2019, 03:16 AM Thread Starter
Minitwins
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Front calliper Replacement Bonnie 2003

Hi, pulled the front calliper off my 2003 Bonnie T100 and discovered top edge of cylinder at dust seal was damaged. That might explain why piston was pitted and seized and brakes didnít work! Rebuild kit with seals and pistons waiting on the workbench not much good if dust seal canít seal.

Long story short, looking for replacement front calliper on eBay. Saw one from 2015 scrambler at a reasonable price but canít find anything on compatibility. Will it fit? If not what models have interchangeable front callipers? Just want to keep standard rather that do 3 piston or brembo upgrade.

Cheers. Love the Bonnie. Would be better if it stopped when needed

Rod (Sydney)
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post #2 of 18 (permalink) Old 03-06-2019, 04:51 PM Thread Starter
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I guess my question is 'Are all front brake calipers the same?"
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post #3 of 18 (permalink) Old 03-06-2019, 06:50 PM
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They are for the carbed 'bikes. Scrambler, Bonneville, Thruxton, America and Speedmaster take the same. Some Speedys have twin discs, don't know if rt is same as lt. As for EFi, can't say for sure.
You could try putting a "wanted" add in the classified section, lots of people including me have upgraded and may have the original knocking around. All my stuff is in storage and under snow (that's white powdered frozen water for those in very southern climates) otherwise I'd see what I could find.
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post #4 of 18 (permalink) Old 03-09-2019, 12:43 PM
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Where would I find the classified section ?
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post #5 of 18 (permalink) Old 03-09-2019, 12:57 PM
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Scroll to the top of the page.
Look under tools.
3rd one down
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post #6 of 18 (permalink) Old 03-09-2019, 07:36 PM
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Where would I find the classified section ?
You have to have 25 posts before you can use the classified section
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post #7 of 18 (permalink) Old 03-09-2019, 09:43 PM
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I guess my question is 'Are all front brake calipers the same?"
There is a very easy way to cross reference parts.... simply go to BikeBandit and put in the info for the two bikes and see if they have the same part number...

In the case of your '03 Bonnie and the '15 Scrambler, they share the same T2020542 listed part number for the caliper...

I hope that helps...
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post #8 of 18 (permalink) Old 03-10-2019, 04:15 PM
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A heads up: even though it's a relatively short run of brake line to the caliper compared to an auto, it takes a helluva lot of pumping the brake lever to bleed the brakes. Unless you have a Mity Vac suction reservoir. ... Which I don't.

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post #9 of 18 (permalink) Old 03-10-2019, 05:00 PM Thread Starter
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Thanks guys
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post #10 of 18 (permalink) Old 03-11-2019, 10:08 AM
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Quote:
Originally Posted by SCbonneville View Post
There is a very easy way to cross reference parts.... simply go to BikeBandit and put in the info for the two bikes and see if they have the same part number...

In the case of your '03 Bonnie and the '15 Scrambler, they share the same T2020542 listed part number for the caliper...

I hope that helps...
This is what I was going to suggest, but I would like to add this for others using this method.

I don't have enough experience with Triumph to know what they're like,but Honda was bad for constantly superseding part numbers, so 2 bikes may still have the same parts even though the P/Ns are different. The online breakdowns are not always good at keeping up with that. So if the 2 were different I would run the part numbers through Google. Sometimes I would find that the older P/N did change up to the newer one.

It does not matter where you go, how you got there, or how long it took you, someone on a Triumph Bonneville has done it before you. If you didn't do it on a Triumph, it doesn't really matter anyway.
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