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Author Topic: 350f Brakes  (Read 1234 times)

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Offline socalenduro

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350f Brakes
« on: December 23, 2009, 11:57:23 AM »
so 1st thing after the holiday my front brake needs new life

Im going to get the rotor machined and drilled by a member here and braided lines from sling shot.

Now the two questions i have...

1) should i get a honda brand master cylinder rebuild kit or just a whole new modern mc and lever? if a new one which one, what size, tips?

2) should i replace the ring on the caliper?
and is this piston worth replacing too?

http://cgi.ebay.com/ebaymotors/Brake-Piston-Honda-CB350F-CB360-CB400F-CB500-CB550_W0QQcmdZViewItemQQhashZitem4a9d46285dQQitemZ320466200669QQptZMotorcyclesQ5fPartsQ5fAccessories
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Offline kslrr

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Re: 350f Brakes
« Reply #1 on: December 23, 2009, 01:08:45 PM »
Some members have had good luck with these new fangled pistons.  Others swear by OEM.  How bad is yours?  And yes, you should replace the seal.  I have no advice concerning the MC.
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Now  1972 CB350FX (experimental v2.0)
        1981 CB650c Custom with '79 engine (wifes)
        1981 CB650 engine
        2004 HD XL883C Custom
        1977 Yamaha XS750D (in progress)
Then 1972 CL175
        1964 Yamaha YGS-1T
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Offline flybox1

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Re: 350f Brakes
« Reply #2 on: December 23, 2009, 01:18:56 PM »
rebuilt my front caliper, but did not have to do the MC. had my rotor drilled and resurfaced too.  once the pads bedded, it stops nicely, and no more squeal!!!
the caliper gasket is worth the few bucks to replace. be sure to clean out the groove it sits in so it seals well.
post us a pic of your piston. i was able to reuse mine.
Depending on the amt of corrosion, you might be able to gently clean it and continue to use it. 
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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)
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Offline fmctm1sw

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Re: 350f Brakes
« Reply #3 on: December 23, 2009, 02:02:38 PM »
I have one of those pistons in my bike.  Works great, sold by a member here.  Definately replace the o ring in there, it can be a pain in the a$$ to get in so be patient.
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline socalenduro

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Re: 350f Brakes
« Reply #4 on: December 23, 2009, 03:04:28 PM »
ill post pics as soon as i get it all apart.... i just wanted to have as many or all of the parts ready to go so i could do it all in one day (or weekend)
Ill go ahead and get that Oring

no thoughts on the master cylinder? i guess one step at a time... just didnt want to put fluid it in, bleed it and then find out i should have rebuilt or replaced the MC

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Offline fmctm1sw

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Re: 350f Brakes
« Reply #5 on: December 24, 2009, 06:55:20 AM »
Quote from: socalenduro on December 23, 2009, 03:04:28 PM

no thoughts on the master cylinder? i guess one step at a time... just didnt want to put fluid it in, bleed it and then find out i should have rebuilt or replaced the MC



Mine have worked ok and I didn't rebuild them.  Does it leak anywhere?  and obviously as long as it isn't frozen...
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline socalenduro

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Re: 350f Brakes
« Reply #6 on: December 24, 2009, 06:59:29 AM »
no leak and not frozen....... just stops really poorly
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Offline hoodellyhoo

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Re: 350f Brakes
« Reply #7 on: December 24, 2009, 10:01:54 PM »
I can't say thet there was anything wrong with my MC, but I rebuilt it just because it seemed like a good idea. I would deffinitely go with oem rebuild kit or maybe K&L. I first used a cheap rebuild kit and the supplied piston was poorly machined. I didn't work well so I got a honda rebuild kit and all everything's fine.

As long as you have your caliper off the bike, make sure you grease the caliper pivot. I also replaced the spring with a new one from the hardware store since the old one was too weak to do its job.
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1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Kevin400F

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Re: 350f Brakes
« Reply #8 on: December 25, 2009, 04:01:07 AM »
Other things to consider are the brake pads themselves and the condition of the rubber hoses.

Regarding the master cylinder, the stock one should work OK if all other components are in good shape, but a modern one with a slightly smaller piston diameter can offer a dramatic improvement in braking power.  

Its all about the hydraulic pressure ratio.....the area of the master cylinder bore versus the caliper bore.  That's the primary reason these old bikes have such a "wooden" brake feel, versus modern bikes.

BTW, below is a more evergreen link to any open eBay brake pistons auctions I have going.  Individual auctions could be expired by the time you read this thread.

http://motors.shop.ebay.com/honfours/m.html?_nkw=&_armrs=1&_from=&_ipg=


« Last Edit: December 25, 2009, 06:42:30 AM by Kevin400F »
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Offline socalenduro

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Re: 350f Brakes
« Reply #9 on: December 27, 2009, 06:12:07 PM »
thanks for all the pointers guys...
Kevin, can you give me more specifics of what aftermarket (modern) master cyl would work? (inexpensive is good)
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