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Author Topic: Brake piston  (Read 821 times)

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Offline Sdsbassist

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  • Gus, Austin, MN.
Brake piston
« on: February 03, 2016, 07:11:59 pm »
So bled my front caliper with a pump. Started to fill lines and again and and good clean fluid coming from nozzle. However, the piston isn't moving and looks cock-eyed. Guessing it's time for a clean and reseal?

Am I on the right track?

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline strynboen

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    • http://forums.sohc4.net/index.php?PHPSESSID=esghpsjqiad2j5voil8hf78t02&/topic,60973.0.html
Re: Brake piston
« Reply #1 on: February 04, 2016, 09:12:18 am »
just pop it aut..and thek for korosion..if fine..just replace the sealing..low kost job
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Offline flybox1

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Re: Brake piston
« Reply #2 on: February 04, 2016, 09:21:33 am »
Quote from: Sdsbassist on February 03, 2016, 07:11:59 pm
Guessing it's time for a clean and reseal?
Yes.
A new seal, and potentially new pads and caliper piston.
This is one of those parts that helps keep you alive, and should not be done half-@$$ed.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

DH

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Re: Brake piston
« Reply #3 on: February 04, 2016, 12:26:28 pm »
+1 to the above. The crud that is probably in there can corrode and jam everything up. It'll be apparant when you separate the caliper halves.
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Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Brake piston
« Reply #4 on: February 04, 2016, 03:08:52 pm »
Yep. It was crud. Got it out. Needs new pads. Piston looks nice. Is the top of piston removable?

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

DH

  • Guest
Re: Brake piston
« Reply #5 on: February 04, 2016, 04:40:42 pm »
Quote from: Sdsbassist on February 04, 2016, 03:08:52 pm
Yep. It was crud. Got it out. Needs new pads. Piston looks nice. Is the top of piston removable?

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My 750k has a dome shape cover that fits into the open end of the piston. My550k has a solid piston with no open end.
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