Author Topic: Front Caliper Rebuild  (Read 947 times)

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Offline irinese

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Front Caliper Rebuild
« on: September 12, 2014, 08:28:34 PM »
So in the process of replacing my brakes I accidentally decided it was a good idea to try to clean up the brake caliper.  I realize now that since I don't know how brakes work that probably wasn't a good idea. 

I cleaned up the caliper.  Put the piston back in--fits great.  Now I'm not sure how to get the brakes working well.  Do I just pump away until the brake fluid fills and pushes the piston?  Doesn't look like the piston is moving.  Do I need to unscrew the master cylinder cap?  I've been looking online at forums but no dice. 

Nic

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Re: Front Caliper Rebuild
« Reply #1 on: September 12, 2014, 08:50:12 PM »
Does the term "bleed the brakes" mean anything to you?

Offline Johnie

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Re: Front Caliper Rebuild
« Reply #2 on: September 12, 2014, 09:17:20 PM »
While you had the piston out did you replace the $4.00 rubber seal in there? Easy and cheap. Then you need to put DOT3 in the master and get all the air out of the line by pumping and bleeding the air out the bleed valve on the caliper. Some guys have trouble getting the air out unless the have a Mighty Vac to aid in creating a vacuum to pull the air out through the bleed valve. Do a search on this site for how to bleed the system.
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
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Offline Stev-o

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Re: Front Caliper Rebuild
« Reply #3 on: September 13, 2014, 01:53:27 AM »
Irine - yes, take the master cylinder cap off and fill with fluid. Note: brake fluid will damage paint, protect your fuel tank.
Read the brake FAQ here....

http://forums.sohc4.net/index.php?topic=259.0

BTW - you can replace your bleeder screw on the caliper with a speed bleeder, it can make bleeding the brakes much easier.

http://www.ebay.com/itm/Honda-Speed-Bleeder-CB350-CB360-CB400-CB450-CB500-CB550-/390928987772?pt=Motorcycles_Parts_Accessories&hash=item5b052ef67c&vxp=mtr

'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline dbbrian350F

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Re: Front Caliper Rebuild
« Reply #4 on: September 13, 2014, 07:11:14 AM »
Another item for my shopping list too! (CB 350F )

Thanks
Bound and determined to restore my...
1974 CB350F1

Lucky new custodian of...
1978 XS1100E

Offline AbbyRider

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Re: Front Caliper Rebuild
« Reply #5 on: September 15, 2014, 07:20:35 PM »
+1 on the speed bleeders. Makes things so much easier.
'98 VTR1000 Superhawk
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Offline goldarrow

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Re: Front Caliper Rebuild
« Reply #6 on: September 15, 2014, 08:28:43 PM »
You can most likely get everything cleaned up, and only thing need replace is the fluid. 
Life Is Full Of Challenges - And My Backyard Is Full Of SOHC4's

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CB750 K0, K2, K23 JDM, K45, K5
And the little ones z50r, xr50r, st90


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