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MG MGA - Brake bleeding issue

Hi I just replaced the brake light switch on my 1958 A with a Ron Francis switch which is supposed to be better. Anyway, I lost an ounce or so of fluid when I did the switch so I proceeded to bleed the brakes with my Mighty Vac bleeder. I started with the right rear but even with 10-12 cycles with the vaccume I still got mostly air so I went to the front and had no problem there. I then went to the left rear but when I loosened the bleeder I got no fluid and no vaccume as if the cylinder was froze. My brakes worked fine before the switch went but could it be possible that I was only using the front brakes and that I have a bad cylinder?

Thanks..............Dennis
Dennis Rogers

Dennis,
Try the conventional method of pumping the pedal with the bleed screw loosened. You normally need an assistant, but it can be done by attaching a hose to the bleed screw and putting it in a container that has brake fluid. You should be able to get fluid to flow. I don't think it's likely that replacing a brake swith would cause this. The car will stop pretty well on front brakes only, but, unless there is a restriction in the brake line you should get fluid out even if the wheel cylinder is bad. Normally, a bad cylinder will leak fluid, not be plugged. Did you remove the bleed screw to see if it is plugged? A Might Vac works pretty well but may not clear a plugged bleed screw. If you have access to an EZ Bleed, give it a try.

Good luck.
GTF
G T Foster

This thread was discussed on 24/08/2008

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This thread is from the archive. The Live MG MGA BBS is active now.