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| Lost brakes https://www.ausmini.com/forums/viewtopic.php?f=2&t=97089 |
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| Author: | gbak17 [ Wed Apr 11, 2018 5:24 pm ] |
| Post subject: | Lost brakes |
Hi, looking for advice. 67 Cooper S, driving home and noticed the braking efficiency had dropped off heaps. I really had to stand on the pedal to stop. The pedal also went down really low. I checked for obvious leaks, nil. There was still fluid in the tank. When I press the brake pedal, there is a hissing noise which I think is coming from the brake booster. Does it sound as if I need a new booster or is there something else I should check first? Thanks in advance. |
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| Author: | 1071 S [ Wed Apr 11, 2018 5:50 pm ] |
| Post subject: | Re: Lost brakes |
A "new" booster is a bit OTT... Its just the diaphragm that probably needs replacing (BTDT) ...although you may as well refurb the rest of it while you're there...(depending on what kit you can find:) Cheers, Ian |
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| Author: | simon k [ Wed Apr 11, 2018 8:18 pm ] |
| Post subject: | Re: Lost brakes |
If the booster has failed, it's not an issue to drive the car without it, the brakes work just as well but you've gotta push the pedal a bit harder. Hydroboost in Echuca can recondition it for you |
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| Author: | Phil 850 [ Thu Apr 12, 2018 7:29 pm ] |
| Post subject: | Re: Lost brakes |
Doesn't the booster just reduce pedal force required. The pedal going lower must surely be a hydraulic issue ? |
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| Author: | 9YaTaH [ Fri Apr 13, 2018 7:51 am ] |
| Post subject: | Re: Lost brakes |
Phil 850 wrote: Doesn't the booster just reduce pedal force required. The pedal going lower must surely be a hydraulic issue ? Yes and No...if the booster is passing fluid through the diaphragm or elsewhere...the pedal pressure will vary and your fluid level at the master will drop. Symptom can be white smoke out the exhaust. If you can stop ("lock") the front wheels from rotating with un-boosted brakes...then that is the best you can hope for... VH40 = 3:1 mechanical advantage VH44 = 2:1 mechanical advantage |
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| Author: | goodie [ Mon Apr 16, 2018 7:27 am ] |
| Post subject: | Re: Lost brakes |
I agree with the booster diagnosis , as for the pedal height , how long since the rears have been adjusted ? |
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