Front brake calipers dragging, Fresh rebuilt, just bled Options

[VaccaRabite]

So, using the long tubes method, I got my brakes bled tonight. The pedal is *really* solid.

But, when I went to each caliper, the Drivers front caliper was tight against the rotor. Passenger front was dragging, but not as much. Both rears were dragging a little. On each rotor I was able to turn it, and it started to come free. However, especially the drivers front, they are not free wheeling.

The rears are easy, I just re-vent them.
The fronts, though. Whats going on there?

I was really stomping on the brakes getting the prop valve bled. I can't imagine that I damaged something. According to Haynes there is no front adjustment. What is to keep them from dragging?

The pedal cluster has also been rebuilt and bushed with bronze bushings. Everything with the brakes has been renewed (rotors, pads, calipers [ E.Shea in the back, I rebuilt the front] hard lines, soft lines) except the prop valve (which does not need it).

Zach

[davep]

The size of hone depends on the bores you are working on. The 914 can have bores from 33mm to 48mm or about 1.25" to 2". The triple stone hone is what I use. Be sure to get a hone that you can get replacement stones for. I like the shorter stones myself. Finer grit is better. You are not looking to remove material from the bore, just to clean it.

Removing stuck pistons requires some ingenuity and a hydraulic system. The easiest hydraulic system is your car. Some grease guns have the correct fitting (10mm by 1.0 pitch) for the fluid inlet. Ingenuity is required to hold the moving piston in place (sealed) while forcing the stuck piston to move. If they are bad, then send them to a pro with the tools and experience to do the job without doing damage (to person or parts).

Getting the pistons cleaned up can be tricky. A very mild acid like citric acid can be used, but it can be hard to obtain. A green scrubby such as used for washing dishes can be used to polish the piston sides. Brass wool can be used. Under no circumstances use steel wool, sandpaper or emery cloth. When Eric says to polish on a bench wheel, I believe he is talking about a cloth wheel, not a grinder or wire wheel. Basically you cannot use anything as hard as the steel for cleaning. If the piston is pitted, then replace it.