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EarlyBay Forums
Technical
Disc Brake upgrade help
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<blockquote data-quote="Happystamps" data-source="post: 605630" data-attributes="member: 14679"><p>Just to clarify- they're not one-way valves, that would be a bad idea. They're residual pressure valves- they serve to keep a bit of pressure inside the brake line (just a little bit! 10PSI on drums because of the springs, 2psi on discs- or thereabouts). This stops the brake fluid falling back into the master cylinder (especially on systems where the caliper is higher up than the master cylinder reservoir) and sucking the cylinder or piston away from the disc/drum surface- which would create excessive pedal travel. You've said all of this, of course <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Just embellishing a bit.</p><p>Please don't install one-way valves in your brake lines ;-)</p></blockquote><p></p>
[QUOTE="Happystamps, post: 605630, member: 14679"] Just to clarify- they're not one-way valves, that would be a bad idea. They're residual pressure valves- they serve to keep a bit of pressure inside the brake line (just a little bit! 10PSI on drums because of the springs, 2psi on discs- or thereabouts). This stops the brake fluid falling back into the master cylinder (especially on systems where the caliper is higher up than the master cylinder reservoir) and sucking the cylinder or piston away from the disc/drum surface- which would create excessive pedal travel. You've said all of this, of course :-) Just embellishing a bit. Please don't install one-way valves in your brake lines ;-) [/QUOTE]
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Disc Brake upgrade help
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