Gold Lifetime Member
Join Date: Jul 2009
Location: casselberry, fl
Can't bleed front caliper !!!
I have a '68 with power front disc brakes and I am having a problem bleeding my driver side front caliper. I'm not using any kind of power or vacuum bleeder. Just a helper pushing the brake pedal.
In this restoration I've gone through the entire brake system.
All new hard lines and hoses.
New 5460346 casting double bleeder master cylinder.
Rebuilt original metering valve.
Rebuilt original distribution block.
Rebuilt original calipers, SS sleeved and rebuilt by Vette Brakes.
So I started with a completely dry system. The back brakes bled fine with no problems.
In my first attempt at bleeding the front brakes, I was getting air, air, and more air. This was my fault. Looing at the master cylinder more from the front than from the side, I thought I was keeping the fluid level plenty high and it turns out, because of the tilt of the master cylinder, what looked plenty high enough at the rear of the front chamber was not covering the port in the bottom, thus lots of air. I was out of fluid and had to quit for the day. Dumb mistake on my part!
More fluid in hand, and knowing I had to keep the fluid lever even higher, we tried again yesterday. The passenger side went fine. A few bubbles at first and them nothing but fluid. Great!
On the driver's side. A few microscopic bubbles at first and it worse not better.......An occasional bubble the size of a BB.....then bigger and bigger bubbles, some and inch or two long. The more I bled, the bigger the bubbles got! I could not get rid of them.
There are no leaks at any of the connections. I pulled the pads out to see if there were leaks at the piston bore seals. The were dry as a bone.
I have to be sucking in air somewhere but I have no idea where. I've pumped more air out that bleeder screw than the system could ever hold.
Any ideas ???
1968, 327 210 HP, Power Steering, Power Disc Brakes, Custom Interior, 4 Speed, Console, Gauges, Tilt Wheel, Speed Warning, Fiber Optics, 10 Bolt 3.55 Posi Rear end......Owned since 1978.