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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 06-03-2011, 05:45 AM   #1 (permalink)
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6 pot Caliper Master cylinder Upgrade !!!

Hi all ive got a Pretech 6 pot Caliper on my 2004 Thruxton.

I wasn't very happy with the feel and the way that the Standard master cylinder operated the brake. There was also the annoying bleeding that took too long as well. So I started looking for the cheap upgrade. The general consensus was that a RGV250 Master Cylinder or a Triumph Speed triple one would both give you the desired feel and pressure. The RGV250 master cylinder was the cheaper so i bought one for 15, the speed triple ones come in around 70. However there is a difference between the two, the RGV is a 5/8 master cylinder(15.8mm) were as the speed triple is a 14mm master cylinder bore.

Fitting was simple as the RGV master and the Thruxton master are almost the same. I aslo fitted a master cylinder rebuild kit before fitting. The two things that cropped up when fitting the new master was that the banjo bolt was not the same thread as the standard one. Luckily i have a spare one in the shed that fitted, second was that the inlet from the reservoir was pointing the wrong way. All a did for this was move the master cylinder reservoir.



I have to admit it bled very easily and gives a much stronger lever, unfortunately it is at this point after a long ride that i have deceded that even though it is better than the original i think the Speed triple would have been the better option. The standard Thruxton master is an 11mm bore and in my opinion doesn't pump enough or give the right feel. However the speed triple master at 14 would be the perfect compromise. In the future i will be changing to the speed triple master as the RGV (16mm) is too large and doesn't give much feel and will give you fore arm pump when riding fast for long periods.

Hope all are well thanks for reading.

Chris.
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Old 06-03-2011, 10:44 AM   #2 (permalink)
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Nice Mod Chris and thanks for the write up with pics - I saw one of these on a thruxton the other day and it definately caught my eye.

I've just done EBC pads and am happy with the improvement but this would be my next step if I wanted to ratchet up the braking power even more.

How much did you shell out for the caliper?
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Old 06-03-2011, 04:15 PM   #3 (permalink)
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The Pretech 6 pot was from here:

http://www.triumphtwinpower.com/pret...ot-caliper.php

There are other very good products on the site.

Chris.
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Old 06-03-2011, 04:18 PM   #4 (permalink)
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You could also consider a 12mm or 1/2" master cylinder, they are cheap and plentiful being fitted to a lot of single disc bikes like the ER500, CB500 etc.

I would imagine there is not much feel with a 5/8" master cylinder- it must be rock solid.
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Old 06-03-2011, 04:48 PM   #5 (permalink)
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Its not too bad actually but i think the 14 would be the real deal. Also remember that the Thruxton pre 2008 has small diameter handle bars. So many don't fit.

Chris.
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Old 06-03-2011, 11:49 PM   #6 (permalink)
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I have the speed triple master on a 2008 thrux with 7/8 clip ons and a Pretech 6 pot caliper. It's awesome. Lots of feel but you can lock the brake if you try, so lots of grip.
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Old 06-04-2011, 06:12 AM   #7 (permalink)
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Hi NorthernThrux, i have seen one of your threads before. However it was the price that made me go for the RGV master. Wish id just bought the speed triple one in the first place now. However don't get me wrong the RGV master is still better than stock and boy did it bleed easier. Still part of the reason behind this thread was to make sure people don't do what i did and buy the lesser master cylinder.

Chris.
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Old 06-04-2011, 06:33 AM   #8 (permalink)
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The inlet from the master cylinder can be rotated, at least the one on my thruxton could. from memory it just needed finger pressure to move it.
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Old 06-04-2011, 09:55 AM   #9 (permalink)
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Hey Chris, This is interesting as I have fitted a 4 pot Beringer and apart from the pain in the ass bleeding issue I am dissapointed with the performance, not wanting to blame the Beringer or Braking wave rotor combo I feel this could be the answer, stock 2004 Thruky clipons so which Speed Triple master should I be looking for, chrz....T50...
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Old 06-04-2011, 10:06 AM   #10 (permalink)
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Thruxster, Have a look at a thread that I started a few weeks ago. I have a beringer 4 pot caliper on my 2004 Thruxton and wasn't happy with the performance so I tried the speedy m/c. I have since abandoned the speedy m/c as there is too litle lever travel (ie too much displacement for the caliper) resulting in a wooden feel. I have since gone back to the OEM m/c. I am now tempted to try the Brembo m/c.

Chris, shoot me a PM if you are interested in my speedy m/c
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Last edited by Aussiematt; 06-04-2011 at 10:32 AM.
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