Rear brake - Victory Forums - Victory Motorcycle Forum
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post #1 of 6 (permalink) Old 08-07-2017, 04:02 PM Thread Starter
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Default Rear brake

Having a problem with losing pressure in my rear brake. Bleed the brake and all is good but after 3 - 4 weeks it starts becoming spongy to the point of nothing. Tried this a few times and end up with the same result. Any suggestions I'm at a lose. No signs of brake fluid leaking anywhere Thanks

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post #2 of 6 (permalink) Old 08-07-2017, 05:41 PM
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Originally Posted by Dlathangue View Post
Having a problem with losing pressure in my rear brake. Bleed the brake and all is good but after 3 - 4 weeks it starts becoming spongy to the point of nothing. Tried this a few times and end up with the same result. Any suggestions I'm at a lose. No signs of brake fluid leaking anywhere Thanks

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I had a similar problem except I had to bleed mine every day.
Changed everything part by part and still the problem persisted!
In desperation I took my rear brake line into a friends home-making business and got him to make me up a new braided line. But it two sections so I could incorporate the brake light pressure switch.
He called, said it was ready to pick up.
Also said the brake pressure switch wasn't very tight on its thread and could have been sucking air but not leaking fluid
Guess what?
He found the problem.
Air molecules are smaller than brake fluid molecules and on a molecular level air can get in without and fluid leak.

Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
PCV
Progressive 465 rear shock
Kingpin USD Forks
18" XC front wheel
1 3/4" 'Burleigh Bars'
Stebel air horn
12.106 @110.90mph
114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
Both tuned by [email protected] Dyno
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post #3 of 6 (permalink) Old 08-07-2017, 05:45 PM Thread Starter
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Thanks

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post #4 of 6 (permalink) Old 08-07-2017, 05:53 PM
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Thanks

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Hope it solves your problem.
Switch is under bike near bottom of shock.
The switch itself could be sucking air internally too but try tightening it first.
I exhausted all other possibilities.
Rebuilt my rear caliper with Brembo seals as Vic done supply seal kits.
Had a brake place rebuild the master cylinder.
Tried Teflon tape on the bleeder screw.
Tried vacuum bleeding... Was tearing my hair out till finally.
Good Luck, hope yours fixes quicker than mine did.

Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
PCV
Progressive 465 rear shock
Kingpin USD Forks
18" XC front wheel
1 3/4" 'Burleigh Bars'
Stebel air horn
12.106 @110.90mph
114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
Both tuned by [email protected] Dyno
110/116

Gold Coast
Australia
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post #5 of 6 (permalink) Old 08-07-2017, 05:55 PM Thread Starter
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Originally Posted by Motorbikerx View Post
Hope it solves your problem.
Switch is under bike near bottom of shock.
The switch itself could be sucking air internally too but try tightening it first.
I exhausted all other possibilities.
Rebuilt my rear caliper with Brembo seals as Vic done supply seal kits.
Had a brake place rebuild the master cylinder.
Tried Teflon tape on the bleeder screw.
Tried vacuum bleeding... Was tearing my hair out till finally.
Good Luck, hope yours fixes quicker than mine did.
Thanks I'll give that a try first

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post #6 of 6 (permalink) Old 08-07-2017, 05:59 PM
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Teflon tape you can get at hardware store. If your going to take stuff do the brake switch
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