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| Brake Question - Master Cylinder? https://www.ausmini.com/forums/viewtopic.php?f=2&t=14620 |
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| Author: | Flashback [ Thu Jan 05, 2006 3:26 pm ] |
| Post subject: | Brake Question - Master Cylinder? |
Just took the Traveller out of the garage for a quick drive this arvo, however when I pushed the brake pedal gently it went straight to the floor! when I then pressed it quickly it hadfull pressure. I've tried it several times and it will do it repeatedly. There are no obvious leaks or loss of fluid so I can only think it's a master cylinder problem. Any ideas guys before I rip it out? |
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| Author: | simon k [ Thu Jan 05, 2006 3:35 pm ] |
| Post subject: | |
probably not the master cylinder, cos it wouldn't hold any pressure, more likely some air has gotten into the system, or a brake line has turned into a balloon |
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| Author: | Steve [ Thu Jan 05, 2006 3:36 pm ] |
| Post subject: | |
Clamp off all brake lines and put your foot on the peddle, if it slowly sinks its the master if not start checking the wheel cylinders steve |
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| Author: | Flashback [ Thu Jan 05, 2006 3:42 pm ] |
| Post subject: | |
Cheers guys, I'll have a look in the morning. |
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| Author: | TheMiniMan [ Thu Jan 05, 2006 6:13 pm ] |
| Post subject: | |
Master cyls can do what he`s saying & when they do that , then it`s normally cause it`s internally by-passing, that is fluid will pass through the worn primary cup when pedal is gently pressed, but shove it hard & the cup expands greatly under the high pressure & seals (for now) 
easy-peasy |
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| Author: | WhoDat [ Thu Jan 05, 2006 6:16 pm ] |
| Post subject: | |
Has it been recently re-kitted??? I have seen this one - there are 2 sizes of master cylinder 0.70" and 0.75" If a large bore master cylinder AND it is litted with the wrong [smaller] punger rubber, then on gentle pressure the fluid just leaks around the plunger rubber [still within the cylinder bore] and the pedal goes to the floor. But if you stab the peda hardl, the sudden pressure forces the cup out against the bore sides and pressure is maintained [while you have your foot on] FWIW Dat |
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