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Author Topic: Do I need this part in my front brake?  (Read 929 times)

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Offline winkster2005

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Do I need this part in my front brake?
« on: April 15, 2016, 04:26:58 AM »
Hi everyone, I bought a new front caliper piston and it does not have a cap over the hollow cavity.  My original piston does.  If I do need this part could I just  pop it off my old piston and tap it onto the new one?
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Offline 70CB750

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Re: Do I need this part in my front brake?
« Reply #1 on: April 15, 2016, 05:20:18 AM »
Yes. And you need the cap.
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Offline winkster2005

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Re: Do I need this part in my front brake?
« Reply #2 on: April 15, 2016, 06:19:32 AM »
That's what I figured, thanks!
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Offline alacrity

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Re: Do I need this part in my front brake?
« Reply #3 on: April 15, 2016, 02:02:03 PM »
cap?
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Offline flybox1

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Re: Do I need this part in my front brake?
« Reply #4 on: April 15, 2016, 02:05:16 PM »
its a small dome cap that fits over the hollow of the caliper piston. 
allows for some rocking of the brake pad for flush rotor contact
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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

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Offline alacrity

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Re: Do I need this part in my front brake?
« Reply #5 on: April 15, 2016, 02:52:08 PM »
Oh... wait ok. is that for the 750 only?
Because I have never seen one on a 500 or 550
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I recently restored and sold a 77 cb750f, and am nearly finished with a (former basket case) cb750k5.  This is a place to share, learn and enjoy.  I am grateful to and for 99+% of this site's membership.

Offline flybox1

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Re: Do I need this part in my front brake?
« Reply #6 on: April 15, 2016, 02:58:19 PM »
Quote from: alacrity on April 15, 2016, 02:52:08 PM
Oh... wait ok. is that for the 750 only?
Because I have never seen one on a 500 or 550
Not all had it. I know the 550F2's didnt. 
Cant say about the others without looking at the fiches.
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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…"
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