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VetteMed · 07-03-2012

I hope I didn't jinx myself. Driving home from work yesterday, my brake pedal was quite soft, with a long travel. Got home, and the forward reservoir was nearly dry (scary!). Today, I inspected the entire system, I can find no evidence of a leak (other than some bubbling caliper powdercoating near the RH front caliper bleeder screw.

Here's where it gets weird.

I bled all 4 calipers -- all the while checking for leaks (none). However, the LH front caliper really didn't give me a good solid fluid stream like the other calipers did, so I'm kind of scratching my head about that one. I did use a vacuum bleeding system, BTW.

So, I tightened the bleeder screws, topped off the fluid, and the brake pedal is now firm as it used to be. I don't get it at all. No signs of leaks anywhere. Perhaps master cylinder leaking into brake booster, only from the front portion of the cylinder? I don't know if that is even possible...

07-03-2012	#13
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,816	Re: Master Brake Cylinder ? I hope I didn't jinx myself. Driving home from work yesterday, my brake pedal was quite soft, with a long travel. Got home, and the forward reservoir was nearly dry (scary!). Today, I inspected the entire system, I can find no evidence of a leak (other than some bubbling caliper powdercoating near the RH front caliper bleeder screw. Here's where it gets weird. I bled all 4 calipers -- all the while checking for leaks (none). However, the LH front caliper really didn't give me a good solid fluid stream like the other calipers did, so I'm kind of scratching my head about that one. I did use a vacuum bleeding system, BTW. So, I tightened the bleeder screws, topped off the fluid, and the brake pedal is now firm as it used to be. I don't get it at all. No signs of leaks anywhere. Perhaps master cylinder leaking into brake booster, only from the front portion of the cylinder? I don't know if that is even possible...