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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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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

Sent from my SM-T560NU using Tapatalk
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.:smile
Air molecules are smaller than brake fluid molecules and on a molecular level air can get in without and fluid leak.
 

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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.
 

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Discussion Starter #5
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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