Speed 4 brake solution? - Triumph Forum: Triumph Rat Motorcycle Forums
Triumph SuperSports Triumph Four-Cylinder Enthusists: TT600, Speed4, and Daytona 600/650

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post #1 of 14 (permalink) Old 03-22-2019, 08:31 PM Thread Starter
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Speed 4 brake solution?

Been having problems with my brakes going soft from time to time. Also noticed a substantial amount of brake fade the last time I took it to the track (high speed track). Being a novice/intermediate level rider I doubt i'm cooking the brakes that much. I've already pulled apart the calipers, cleaned, and thoroughly bleed the brakes.

What's the end all brake solution for these things? Thought I read something about using the brake pistons from the Daytona 675's.
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post #2 of 14 (permalink) Old 03-25-2019, 12:52 AM
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That was for the Sprints brakes...... might work on the TT's too.

Double check on the Sprint forum.

Noticed today mine had a lot of free travel. Will pull the calipers, pump the pistons out most of the way, hose them with brake cleaner and an old tooth brush. Should be good to go.

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post #3 of 14 (permalink) Old 03-25-2019, 07:16 PM
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My take is that you have air in the brakes somewhere. How old are the lines? Have you rebuilt the MC and calipers? Not just cleaned, but replaced the rubber. None of that stuff lasts forever.

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post #4 of 14 (permalink) Old 04-25-2019, 05:25 PM
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Daytona 675 pistons is the fix. Something to do about the fancy coating the pistons have that the Sprint's, TT600's, and Speed 4's dont have.
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post #5 of 14 (permalink) Old 04-26-2019, 01:55 AM
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This has been an issue with that master cylinder/caliper combo for ever. Affects T595. 955 Daytona/Speed Triple, Sprint RS/ST, TT600, Daytona 600/650 and Speed4.

Bothers some people, others just live with it.

Been discussed to death with some very creative bleeding methods proposed.

Yes, you can bleed it to buggery, you can reverse bleed it, you can tie the brake lever back to the handlebar for a week, you can replace all the seals, you can swop the caliper pistons. It'll still go squishy with lots of lever travel. Air getting in the system? Maybe, but no one, including Triumph, has worked out how. The problem even carried over to the first '05-'07 radial caliper equipped 1050 Speed Triple. Yes, Triumph identified an issue with some of the coatings on some caliper pistons and issued a Tech Bulletin about it. One of several they issued over the years about the issue.

You want to fix it?

Replace the stock 14mmØ master cylinder with a 5/8"Ø unit from one of the '07 and on 1050's as Triumph eventually did (hallelujah). Less lever travel, much firmer feel. That bit we understand. Oh and it doesn't go squishy a week after bleeding. Go figure. That bit we don't understand.

Last edited by Terry Colley; 04-26-2019 at 02:07 AM.
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post #6 of 14 (permalink) Old 04-26-2019, 02:03 AM
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BTW you can use a 5/8"Ø master cylinder off another make of bike. It's a Nissin. Kawasaki used the exact same one with the same remote reservoir for many years and they're plentiful at the wreckers.

Let us know how you go.

Last edited by Terry Colley; 04-26-2019 at 02:12 AM.
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post #7 of 14 (permalink) Old 04-29-2019, 01:06 PM
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I believe you can.

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post #8 of 14 (permalink) Old 04-30-2019, 01:16 AM Thread Starter
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All years of the D675 use the same brakes? Probably find a cheap set of calipers off fleabay and steal the pistons. Planning on doing a full brake system overhaul and figured i'd do the pistons while I was in there, but couldn't find where I read about the daytona pistons.
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post #9 of 14 (permalink) Old 04-30-2019, 01:24 PM
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Quote:
Originally Posted by farmer_frank View Post
All years of the D675 use the same brakes? Probably find a cheap set of calipers off fleabay and steal the pistons. Planning on doing a full brake system overhaul and figured i'd do the pistons while I was in there, but couldn't find where I read about the daytona pistons.
I'll be interested in knowing how everything fits.

Will
It's a squid thing. You wouldn't understand.

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post #10 of 14 (permalink) Old 05-01-2019, 12:38 AM Thread Starter
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How many different brake packages did triumph offer on the D675? Parts listing for the 2006 model shows three different calipers, (standard nissan, monoblock nissan, brembo) and of course they all have different piston/seal kit part numbers. Knowing my calipers are just rebranded nissans we'll focus on the nissans. The standard split caliper nissan uses piston/seal kit T2020465 which shows as a fit for a wide range of bikes going all the way back to 1994 on the speed triple. The monoblock caliper piston/seal kit is T2021222 which fits only D675's from 2006 onwards.

Upon further inspection I discovered that the split caliper nissans use the same seal kit as the speed four so one would think the pistons would be a direct swap. I suspect the monoblocks use the same piston, but using different seals the piston/seal kit number is different and they don't offer the pistons by themselves so we can't directly compare part numbers between them.
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