Rebuilding (not master) cylinder brakes


Technical information and Q&A applicable to all years and models of Goldwings
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froche
Posts: 306
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A)
2002 GL1800

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Rebuilding (not master) cylinder brakes

Post by froche »



I rebuilt brake cylinders on all 3 brakes. Items i have noticed and a tip.

1) All 3 cylinders were "broken" because both pistons in each cylinder did not come out at the same rate, and even got stuck.
2) Speed Bleeders are really great!
3) A Dremel tool with a brass wire brush (see picture) is perfect for cleaning out the recesses that hold the hydraulic and dust o rings. Figured this out when i didn't use this on the back brake, pistons push in much easier after.
4) A glue type needle injector is a great tool to have for lubing the pistons when pushing in.
5) A drill mounted scrunge pad works great and shouldn't remove any metal.

brass wire brush
brass wire brush

'

scrunge pad
scrunge pad




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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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Re: Rebuilding (not master) cylinder brakes

Post by WingAdmin »

Be careful, as many aluminum alloys are softer than brass, and a brass brush will score the cylinder walls, which is then going to wear out the new seals very quickly. You might be better off using nylon bristle brushes in your Dremel:

https://www.amazon.com/Dremel-403-02-Ny ... B015PK3BC8

froche
Posts: 306
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A)
2002 GL1800

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: Rebuilding (not master) cylinder brakes

Post by froche »

Yes soft aluminium vs hard brass can be a problem. In my case the brass brush was fairly soft and the RPM on the dremel was fairly low (variable speed unit). But I didn't work real hard just a few times around and not pushing too hard, just enough to get rubber and corrosion off.

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