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strange brake problem

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damageandy Part of things Posts: 640	strange brake problem damageandy @damageandy
	May 21, 2010 6:38:18 GMT Select Post Deselect Post Link to Post Back to Top
	so i was out in the p100 yesterday and the brake pedal started to feel like it was goin down further, go to my mates and went out on the bikes, on return loaded up the van to find the pedal going all the way to the floor, pumping did not bring it back up either. no fluids leaks at all, so got up today to get take the old master off, jumped in the van to roll it back a little, boom pedal working as normal, brakes working as normal on a test drive. think ill still go and buy a new master cylinder to be on the safe side, anyone had this happen to them?


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retrowagen1234 Guest	strange brake problemretrowagen1234 @GUEST
	May 21, 2010 7:40:42 GMT Select Post Deselect Post Link to Post Back to Top
	hmmmm, did it blow any fluid out the top of the cylinder? could be blocked and only allowing the fluid to come up and out?


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damageandy Part of things Posts: 640	strange brake problem damageandy @damageandy
	May 21, 2010 8:06:41 GMT Select Post Deselect Post Link to Post Back to Top
	nope no fluid leaks any where at all. ive had masters go on a few cars but they never start working perfectly after again. seems very strange.


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e21meister Guest	strange brake probleme21meister @GUEST
	May 21, 2010 8:11:02 GMT Select Post Deselect Post Link to Post Back to Top
	Could also be a vacuum problem with the servo. Make sure you check for air leaks too. Servos can corrode underneath (and therefore out of site) along the seam that holds the front half to the back half and as a result air can escape.


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pantera2075 Part of things Posts: 546	strange brake problem pantera2075 @pantera2075
	May 21, 2010 8:34:11 GMT Select Post Deselect Post Link to Post Back to Top
	Had this a couple of weeks ago on a mini. It's the master cyl seals letting fluid past the seal between the 2 circuits when used/pumped. Then when you leave it for a bit, it self bleeds back past the seals to where it should be. It'll get worse very quickly.
	'83 GTM Coupe. 4A-GE Powered '00 GTM Libra Auto. Ick. '71 Detomaso Pantera. Current Resto '89 GMC Safari Tow/Kip bus '05 SAAB 9-3 Daily '71 Siva Moonbug. Not even contemplating resto yet.

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kv77 Part of things Posts: 62	strange brake problem kv77 @kv77
	May 21, 2010 9:14:27 GMT Select Post Deselect Post Link to Post Back to Top
	May 21, 2010 8:11:02 GMT @e21meister said: Could also be a vacuum problem with the servo. Make sure you check for air leaks too. Servos can corrode underneath (and therefore out of site) along the seam that holds the front half to the back half and as a result air can escape. Can't see how this would make the pedal go to the floor. Wouldn't a leaking servo cause the engine to run like curse word also? definitely sounds like internal leakage in the MC imho How about a rebuild? Or are ford parts so cheap you shouldn't be bothered about that?
	Last Edit: May 21, 2010 9:17:32 GMT by kv77 <a href="http://retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=81096&page=1"> My 1975 Mazda 616</a>

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damageandy Part of things Posts: 640	strange brake problem damageandy @damageandy
	May 21, 2010 10:05:36 GMT Select Post Deselect Post Link to Post Back to Top
	I thought id be able to get one for cheap but don't seem to be common anymore so rather expensive. ill have a look I breakers today and replace seals in one of them. 100% its the master, cheers for the help chaps
	Last Edit: May 21, 2010 10:06:59 GMT by damageandy

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kapri Posted a lot [][] Posts: 1,562	strange brake problem kapri @aceadvice
	May 21, 2010 11:48:07 GMT Select Post Deselect Post Link to Post Back to Top
	Normally leaking m/c seals will show up as small trace air bubbles in the clear reservoir as you depress the pedal.


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