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Author Topic: Front brake lever has no play  (Read 3964 times)

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Offline Johnny340

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Re: Front brake lever has no play
« Reply #25 on: February 27, 2020, 06:11:45 PM »


Quote from: BenelliSEI on February 27, 2020, 04:05:43 PM
Are you sure that pad is the correct one and really seated in the caliper??

I thought they were seated correctly but I'll double check when I am changing the rotor.


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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

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Re: Front brake lever has no play
« Reply #26 on: March 05, 2020, 09:44:22 PM »
So the proper rotor is installed now and the pads looked good on the calliper, which is now mounted correctly. The play at the lever is still minimal and if I try to adjust the inside pad further away to create some play, the outside pad just pulls it over and leaves the adjuster bolt sticking out on the inside. Pics below show this as well as the distance the lever moves.
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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline scottly

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Re: Front brake lever has no play
« Reply #27 on: March 05, 2020, 09:54:01 PM »
That must be a larger than stock MC..
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Offline Johnny340

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Re: Front brake lever has no play
« Reply #28 on: March 05, 2020, 09:58:11 PM »
Quote from: scottly on March 05, 2020, 09:54:01 PM
That must be a larger than stock MC..
I found the bill for the mc.
It’s from vintagecb750  Part #: 08-0253 and is 5/8”.
Is this ok? The braided lines make for a rock hard pull...just not enough travel.
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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline scottly

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Re: Front brake lever has no play
« Reply #29 on: March 05, 2020, 10:09:44 PM »
5/8'' (15.87mm) is way too big for a single caliper, IMHO.
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Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline Scott S

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Re: Front brake lever has no play
« Reply #30 on: March 06, 2020, 03:22:55 AM »
 It should be the 14mm version.
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'81 Yamaha XS650

Offline PeWe

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Re: Front brake lever has no play
« Reply #31 on: March 06, 2020, 07:40:16 AM »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Johnny340

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Re: Front brake lever has no play
« Reply #32 on: March 06, 2020, 09:50:10 AM »
Thank you all! I now know what I need to make it ideal.

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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline robvangulik

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Re: Front brake lever has no play
« Reply #33 on: March 06, 2020, 11:13:12 AM »
Quote from: Johnny340 on March 06, 2020, 09:50:10 AM
Thank you all! I now know what I need to make it ideal.

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Right, a half inch master cylinder ;)
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Offline Johnny340

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Re: Front brake lever has no play
« Reply #34 on: March 06, 2020, 12:14:06 PM »
Quote from: robvangulik on March 06, 2020, 11:13:12 AM
Quote from: Johnny340 on March 06, 2020, 09:50:10 AM
Thank you all! I now know what I need to make it ideal.

Sent from my SM-A705W using Tapatalk
Right, a half inch master cylinder ;)
My Johnson is already a full half inch.

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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline scottly

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Re: Front brake lever has no play
« Reply #35 on: March 06, 2020, 09:39:51 PM »
Quote from: robvangulik on March 06, 2020, 11:13:12 AM
Quote from: Johnny340 on March 06, 2020, 09:50:10 AM
Thank you all! I now know what I need to make it ideal.

Sent from my SM-A705W using Tapatalk
Right, a half inch master cylinder ;)
1+ A 1/2" MC should work well with your 42.8mm caliper.
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Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline Johnny340

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Re: Front brake lever has no play
« Reply #36 on: October 12, 2020, 05:58:56 PM »
Just to close this off, you guys were correct (as usual). I installed a 14mm master cylinder in place of this 5/8" one and the difference is huge!  Great modulation now with this smaller master cylinder on my single disc front brake.
Thanks again!
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1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250
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