92 907IE front brake

discussions specific to the 907IE
steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
Location: USA

92 907IE front brake

Post by steved001 »

New to the forum. I have a 92 907ie, owned from new. Not long ago the front brake handle started going all the way tot he stop, so I'm assuming I need to rebuild the master cyl. No leakage.

Any suggestions on where I can get a rebuild kit?
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Mc tool
paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: 92 907IE front brake

Post by Mc tool »

Try bleeding the brakes 1st ,using new fluid making sure to flush out all the old fluid with the new , easy to see as the old fluid will be darker than the new stuff. If that dont sort it you can buy kits for brembo gear from a few different sites ,if you do wind up needing a kit you should probly replace the brake hoses as well, they dont last for ever
I wish I was young again............Id be heaps smarter than last time
steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
Location: USA

Re: 92 907IE front brake

Post by steved001 »

Thanks, good suggestion, I'll give that a try.

Any preferred sources for rebuild kits and hoses?
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Mc tool
paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: 92 907IE front brake

Post by Mc tool »

There are 907 hose kits on ebay now. On your master cyl there is a 2 digit number cast into it , this refers to the diameter of the cylinder, any brembo supplier can supply the kit , I use MG cycle , its a moto guzzi site but the brembo stuff is common to guzzi. There are heaps of suppliers in the US , do the google thing to find one close to you .
I wish I was young again............Id be heaps smarter than last time
steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
Location: USA

Re: 92 907IE front brake

Post by steved001 »

Will do, thank you.
steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
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Re: 92 907IE front brake

Post by steved001 »

PS

I love NZ by the way, especially South Island, Fiordland, Otago Peninsula and Akaroa.
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Mc tool
paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
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Re: 92 907IE front brake

Post by Mc tool »

Grass is always greener, I want to live in Montana.
I wish I was young again............Id be heaps smarter than last time
steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
Location: USA

Re: 92 907IE front brake

Post by steved001 »

Montana is beautiful as well, and only 440 covid cases...
davo
Posts: 103
Joined: Wed Mar 12, 2008 10:22 pm
model: 907 I.E.
year: 1992
Location: Melbourne, Australia

Re: 92 907IE front brake

Post by davo »

Don`t forget when bleeding the brakes to push the brake pads all the way back a few times to force the old fluid out of the caliper.
This way your not just changing the fluid in the hose.
And remember: ride hard, take chances!
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Mc tool
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Re: 92 907IE front brake

Post by Mc tool »

Not sure I agree with that davo, you would have to clean all the road crud off the pistons before shoving them back thru the seals, and I have always relied on the flow of fluid to carry the old stuff out the bleed nipple . I can see the theory behind such a move but I have never heard of it before. It can become a big job because logic suggests that .......if you change the m/cyl you should change the fluid , so maybe should clean out the calipers and if you do that you will need new caliper seals ......may as well replace old hoses and pads too then , and you wind up reconditioning the whole system ....then theres the back brakes .....and the clutch.....which can be a proper bastard to bleed. Dont get me wrong , its all good stuff to do , something a lot of peeps overlook .
My car has abs and stability control, the plan was to change ALL the fluid but when I saw all the pipes and hoses ,mysterious looking slabs of steel bristling with said pipes and hoses and electric motor .......I took it to the dealer . :)
I wish I was young again............Id be heaps smarter than last time
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Derek
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Re: 92 907IE front brake

Post by Derek »

I agree with Davo. There is a considerable volume of fluid behind the pistons relative to the volume of the system. It not difficult to unmount the calipers, remove the pads and clean the pistons before pushing them back and it's good preventative maintenance to help prevent future problems with potentially seized pistons.
1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


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steved001
Posts: 6
Joined: Sun Apr 05, 2020 8:10 pm
model: 907 I.E.
year: 1992
Location: USA

Re: 92 907IE front brake

Post by steved001 »

My inclination is to remove calipers, clean thoroughly, inspect and push pistons in.

I'll report my findings.

I ordered a rebuild kit.

Thanks.
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Mc tool
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Re: 92 907IE front brake

Post by Mc tool »

Yeah ok , but if your going to that much trouble why not just take the pistons right out and clean the whole thing out completely
I wish I was young again............Id be heaps smarter than last time
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Derek
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Re: 92 907IE front brake

Post by Derek »

Mc tool wrote:Yeah ok , but if your going to that much trouble why not just take the pistons right out and clean the whole thing out completely
Moving the pistons out as far as you dare and cleaning them should be plenty. If the seals aren't leaking and the pistons are moving freely I think it's best to leave well alone or you can end up in a postion where you do need new seals and can't readily obtain them.
1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


Scotland
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Mc tool
paso grand pooh-bah
Posts: 1794
Joined: Wed Dec 05, 2007 12:35 am
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year: 1990
Location: Newzealand

Re: 92 907IE front brake

Post by Mc tool »

Yeah ok , but what about all the crap in behind the piston and the corrosion that builds up behind the seals? And the old dust seals will have to be removed before you can clean the piston , and chances are good that they wont come off in one bit and being 30 odd years old you should not refit them ....and there's your seal kit.
And as for common brembo parts not being readily obtainable....ah you can buy them any country where brembo equiped bikes are sold ,I have 2 sets of f08 seals and dust seals if anyone is so hard up for parts. There are 3 suppliers selling f08 seal kits and 2 selling brembo 30/34mm seal kits on ebay now. Seriously , if you guys are ok with waisting time fucking about doing a half arsed job one way or another go for it , I cant be arsed bickering over it
I wish I was young again............Id be heaps smarter than last time
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